Ran Convert > To Modern Objective C Syntax

Examples/UIExplorer/UIExplorerIntegrationTests/IntegrationTests.m

@@ -29,7 +29,7 @@
   RCTAssert(NO, @"Tests should be run on 32-bit device simulators (e.g. iPhone 5)");
 #endif
 
-  NSOperatingSystemVersion version = [[NSProcessInfo processInfo] operatingSystemVersion];
+  NSOperatingSystemVersion version = [NSProcessInfo processInfo].operatingSystemVersion;
   RCTAssert(version.majorVersion == 8 || version.minorVersion >= 3, @"Tests should be run on iOS 8.3+, found %zd.%zd.%zd", version.majorVersion, version.minorVersion, version.patchVersion);
   _runner = RCTInitRunnerForApp(@"Examples/UIExplorer/UIExplorerIntegrationTests/js/IntegrationTestsApp", nil);
 }

Examples/UIExplorer/UIExplorerIntegrationTests/RCTUIManagerScenarioTests.m

@@ -50,7 +50,7 @@
   // Register 20 views to use in the tests
   for (NSInteger i = 1; i <= 20; i++) {
     UIView *registeredView = [UIView new];
-    [registeredView setReactTag:@(i)];
+    registeredView.reactTag = @(i);
     _uiManager.viewRegistry[i] = registeredView;
   }
 }
@@ -92,7 +92,7 @@
 
   NSArray *removeAtIndices = @[@0, @4, @8, @12, @16];
   for (NSNumber *index in removeAtIndices) {
-    NSNumber *reactTag = @([index integerValue] + 2);
+    NSNumber *reactTag = @(index.integerValue + 2);
     [removedViews addObject:_uiManager.viewRegistry[reactTag]];
   }
   for (NSInteger i = 2; i < 20; i++) {

Examples/UIExplorer/UIExplorerIntegrationTests/UIExplorerSnapshotTests.m

@@ -36,7 +36,7 @@
   RCTAssert(NO, @"Tests should be run on 32-bit device simulators (e.g. iPhone 5)");
 #endif
 
-  NSOperatingSystemVersion version = [[NSProcessInfo processInfo] operatingSystemVersion];
+  NSOperatingSystemVersion version = [NSProcessInfo processInfo].operatingSystemVersion;
   RCTAssert(version.majorVersion == 8 || version.minorVersion >= 3, @"Snapshot tests should be run on iOS 8.3+, found %zd.%zd.%zd", version.majorVersion, version.minorVersion, version.patchVersion);
   _runner = RCTInitRunnerForApp(@"Examples/UIExplorer/UIExplorerApp.ios", nil);
   _runner.recordMode = NO;

Examples/UIExplorer/UIExplorerUnitTests/RCTUIManagerTests.m

@@ -49,7 +49,7 @@
   // Register 20 views to use in the tests
   for (NSInteger i = 1; i <= 20; i++) {
     UIView *registeredView = [UIView new];
-    [registeredView setReactTag:@(i)];
+    registeredView.reactTag = @(i);
     _uiManager.viewRegistry[i] = registeredView;
   }
 }
@@ -91,7 +91,7 @@
 
   NSArray *removeAtIndices = @[@0, @4, @8, @12, @16];
   for (NSNumber *index in removeAtIndices) {
-    NSNumber *reactTag = @([index integerValue] + 2);
+    NSNumber *reactTag = @(index.integerValue + 2);
     [removedViews addObject:_uiManager.viewRegistry[reactTag]];
   }
   for (NSInteger i = 2; i < 20; i++) {

Libraries/ActionSheetIOS/RCTActionSheetManager.m

@@ -60,7 +60,7 @@ RCT_EXPORT_METHOD(showActionSheetWithOptions:(NSDictionary *)options
 
   _callbacks[RCTKeyForInstance(actionSheet)] = successCallback;
 
-  UIWindow *appWindow = [[[UIApplication sharedApplication] delegate] window];
+  UIWindow *appWindow = [UIApplication sharedApplication].delegate.window;
   if (appWindow == nil) {
     RCTLogError(@"Tried to display action sheet but there is no application window. options: %@", options);
     return;
@@ -81,12 +81,12 @@ RCT_EXPORT_METHOD(showShareActionSheetWithOptions:(NSDictionary *)options
   if (URL) {
     [items addObject:URL];
   }
-  if ([items count] == 0) {
+  if (items.count == 0) {
     failureCallback(@[@"No `url` or `message` to share"]);
     return;
   }
   UIActivityViewController *share = [[UIActivityViewController alloc] initWithActivityItems:items applicationActivities:nil];
-  UIViewController *ctrl = [[[[UIApplication sharedApplication] delegate] window] rootViewController];
+  UIViewController *ctrl = [UIApplication sharedApplication].delegate.window.rootViewController;
 
 #if __IPHONE_OS_VERSION_MIN_REQUIRED < __IPHONE_8_0
 
@@ -126,7 +126,7 @@ RCT_EXPORT_METHOD(showShareActionSheetWithOptions:(NSDictionary *)options
     RCTLogWarn(@"No callback registered for action sheet: %@", actionSheet.title);
   }
 
-  [[[[UIApplication sharedApplication] delegate] window] makeKeyWindow];
+  [[UIApplication sharedApplication].delegate.window makeKeyWindow];
 }
 
 #pragma mark Private

Libraries/Geolocation/RCTLocationObserver.m

@@ -252,7 +252,7 @@ RCT_EXPORT_METHOD(getCurrentPosition:(RCTLocationOptions)options
 - (void)locationManager:(CLLocationManager *)manager didUpdateLocations:(NSArray *)locations
 {
   // Create event
-  CLLocation *location = [locations lastObject];
+  CLLocation *location = locations.lastObject;
   _lastLocationEvent = @{
     @"coords": @{
       @"latitude": @(location.coordinate.latitude),

Libraries/Image/RCTCameraRollManager.m

@@ -34,12 +34,12 @@ RCT_EXPORT_METHOD(saveImageWithTag:(NSString *)imageTag
       errorCallback(loadError);
       return;
     }
-    [_bridge.assetsLibrary writeImageToSavedPhotosAlbum:[loadedImage CGImage] metadata:nil completionBlock:^(NSURL *assetURL, NSError *saveError) {
+    [_bridge.assetsLibrary writeImageToSavedPhotosAlbum:loadedImage.CGImage metadata:nil completionBlock:^(NSURL *assetURL, NSError *saveError) {
       if (saveError) {
         RCTLogWarn(@"Error saving cropped image: %@", saveError);
         errorCallback(saveError);
       } else {
-        successCallback(@[[assetURL absoluteString]]);
+        successCallback(@[assetURL.absoluteString]);
       }
     }];
   }];
@@ -47,7 +47,7 @@ RCT_EXPORT_METHOD(saveImageWithTag:(NSString *)imageTag
 
 - (void)callCallback:(RCTResponseSenderBlock)callback withAssets:(NSArray *)assets hasNextPage:(BOOL)hasNextPage
 {
-  if (![assets count]) {
+  if (!assets.count) {
     callback(@[@{
                  @"edges": assets,
                  @"page_info": @{
@@ -109,14 +109,14 @@ RCT_EXPORT_METHOD(getPhotos:(NSDictionary *)params
 
       [group enumerateAssetsWithOptions:NSEnumerationReverse usingBlock:^(ALAsset *result, NSUInteger index, BOOL *stopAssets) {
         if (result) {
-          NSString *uri = [(NSURL *)[result valueForProperty:ALAssetPropertyAssetURL] absoluteString];
+          NSString *uri = ((NSURL *)[result valueForProperty:ALAssetPropertyAssetURL]).absoluteString;
           if (afterCursor && !foundAfter) {
             if ([afterCursor isEqualToString:uri]) {
               foundAfter = YES;
             }
             return; // Skip until we get to the first one
           }
-          if (first == [assets count]) {
+          if (first == assets.count) {
             *stopAssets = YES;
             *stopGroups = YES;
             hasNextPage = YES;
@@ -138,7 +138,7 @@ RCT_EXPORT_METHOD(getPhotos:(NSDictionary *)params
                                       @"width": @(dimensions.width),
                                       @"isStored": @YES,
                                       },
-                                  @"timestamp": @([date timeIntervalSince1970]),
+                                  @"timestamp": @(date.timeIntervalSince1970),
                                   @"location": loc ?
                                   @{
                                     @"latitude": @(loc.coordinate.latitude),

Libraries/Image/RCTGIFImage.m

@@ -85,7 +85,7 @@ CAKeyframeAnimation *RCTGIFImageWithFileURL(NSURL *URL)
     return nil;
   }
 
-  if (![URL isFileURL]) {
+  if (!URL.fileURL) {
     RCTLogError(@"Loading remote image URLs synchronously is a really bad idea.");
     return nil;
   }

Libraries/Image/RCTImageLoader.m

@@ -170,7 +170,7 @@ static UIImage *RCTScaledImageForAsset(ALAssetRepresentation *representation,
     // The 'ph://' prefix is used by FBMediaKit to differentiate between
     // assets-library. It is prepended to the local ID so that it is in the
     // form of an, NSURL which is what assets-library uses.
-    NSString *phAssetID = [imageTag substringFromIndex:[@"ph://" length]];
+    NSString *phAssetID = [imageTag substringFromIndex:@"ph://".length];
     PHFetchResult *results = [PHAsset fetchAssetsWithLocalIdentifiers:@[phAssetID] options:nil];
     if (results.count == 0) {
       NSString *errorText = [NSString stringWithFormat:@"Failed to fetch PHAsset with local identifier %@ with no error message.", phAssetID];
@@ -179,7 +179,7 @@ static UIImage *RCTScaledImageForAsset(ALAssetRepresentation *representation,
       return ^{};
     }
 
-    PHAsset *asset = [results firstObject];
+    PHAsset *asset = results.firstObject;
 
     PHImageRequestOptions *imageOptions = [PHImageRequestOptions new];
 

Libraries/Image/RCTImagePickerManager.m

@@ -53,7 +53,7 @@ RCT_EXPORT_METHOD(openCameraDialog:(NSDictionary *)config
                   successCallback:(RCTResponseSenderBlock)callback
                   cancelCallback:(RCTResponseSenderBlock)cancelCallback)
 {
-  UIWindow *keyWindow = [[UIApplication sharedApplication] keyWindow];
+  UIWindow *keyWindow = [UIApplication sharedApplication].keyWindow;
   UIViewController *rootViewController = keyWindow.rootViewController;
 
   UIImagePickerController *imagePicker = [UIImagePickerController new];
@@ -75,7 +75,7 @@ RCT_EXPORT_METHOD(openSelectDialog:(NSDictionary *)config
                   successCallback:(RCTResponseSenderBlock)callback
                   cancelCallback:(RCTResponseSenderBlock)cancelCallback)
 {
-  UIWindow *keyWindow = [[UIApplication sharedApplication] keyWindow];
+  UIWindow *keyWindow = [UIApplication sharedApplication].keyWindow;
   UIViewController *rootViewController = keyWindow.rootViewController;
 
   UIImagePickerController *imagePicker = [UIImagePickerController new];
@@ -109,7 +109,7 @@ didFinishPickingMediaWithInfo:(NSDictionary *)info
   [_pickerCallbacks removeObjectAtIndex:index];
   [_pickerCancelCallbacks removeObjectAtIndex:index];
 
-  UIWindow *keyWindow = [[UIApplication sharedApplication] keyWindow];
+  UIWindow *keyWindow = [UIApplication sharedApplication].keyWindow;
   UIViewController *rootViewController = keyWindow.rootViewController;
   [rootViewController dismissViewControllerAnimated:YES completion:nil];
 
@@ -125,7 +125,7 @@ didFinishPickingMediaWithInfo:(NSDictionary *)info
   [_pickerCallbacks removeObjectAtIndex:index];
   [_pickerCancelCallbacks removeObjectAtIndex:index];
 
-  UIWindow *keyWindow = [[UIApplication sharedApplication] keyWindow];
+  UIWindow *keyWindow = [UIApplication sharedApplication].keyWindow;
   UIViewController *rootViewController = keyWindow.rootViewController;
   [rootViewController dismissViewControllerAnimated:YES completion:nil];
 

Libraries/Image/RCTImageRequestHandler.m

@@ -22,13 +22,13 @@ RCT_EXPORT_MODULE()
 
 - (BOOL)canHandleRequest:(NSURLRequest *)request
 {
-  return [@[@"assets-library", @"ph"] containsObject:[request.URL.scheme lowercaseString]];
+  return [@[@"assets-library", @"ph"] containsObject:request.URL.scheme.lowercaseString];
 }
 
 - (id)sendRequest:(NSURLRequest *)request
      withDelegate:(id<RCTURLRequestDelegate>)delegate
 {
-  NSString *URLString = [request.URL absoluteString];
+  NSString *URLString = request.URL.absoluteString;
 
   __block RCTImageLoaderCancellationBlock requestToken = nil;
   requestToken = [_bridge.imageLoader loadImageWithTag:URLString callback:^(NSError *error, UIImage *image) {

Libraries/Image/RCTImageStoreManager.m

@@ -21,7 +21,7 @@
 
 RCT_EXPORT_MODULE()
 
-- (id)init
+- (instancetype)init
 {
   if ((self = [super init])) {
 
@@ -34,7 +34,7 @@ RCT_EXPORT_MODULE()
 - (NSString *)storeImage:(UIImage *)image
 {
   RCTAssertMainThread();
-  NSString *tag = [NSString stringWithFormat:@"rct-image-store://%tu", [_store count]];
+  NSString *tag = [NSString stringWithFormat:@"rct-image-store://%tu", _store.count];
   _store[tag] = image;
   return tag;
 }
@@ -101,13 +101,13 @@ RCT_EXPORT_METHOD(addImageFromBase64:(NSString *)base64String
 
 - (BOOL)canHandleRequest:(NSURLRequest *)request
 {
-  return [@[@"rct-image-store"] containsObject:[request.URL.scheme lowercaseString]];
+  return [@[@"rct-image-store"] containsObject:request.URL.scheme.lowercaseString];
 }
 
 - (id)sendRequest:(NSURLRequest *)request
      withDelegate:(id<RCTURLRequestDelegate>)delegate
 {
-  NSString *imageTag = [request.URL absoluteString];
+  NSString *imageTag = request.URL.absoluteString;
   [self getImageForTag:imageTag withBlock:^(UIImage *image) {
     if (!image) {
       NSError *error = RCTErrorWithMessage([NSString stringWithFormat:@"Invalid imageTag: %@", imageTag]);

Libraries/Image/RCTImageView.m

@@ -42,7 +42,7 @@
   return self;
 }
 
-RCT_NOT_IMPLEMENTED(-init)
+RCT_NOT_IMPLEMENTED(- (instancetype)init)
 
 - (void)updateImage
 {

Libraries/LinkingIOS/RCTLinkingManager.m

@@ -42,7 +42,7 @@ RCT_EXPORT_MODULE()
   sourceApplication:(NSString *)sourceApplication
          annotation:(id)annotation
 {
-  NSDictionary *payload = @{@"url": [URL absoluteString]};
+  NSDictionary *payload = @{@"url": URL.absoluteString};
   [[NSNotificationCenter defaultCenter] postNotificationName:RCTOpenURLNotification
                                                       object:self
                                                     userInfo:payload];
@@ -52,7 +52,7 @@ RCT_EXPORT_MODULE()
 - (void)handleOpenURLNotification:(NSNotification *)notification
 {
   [_bridge.eventDispatcher sendDeviceEventWithName:@"openURL"
-                                              body:[notification userInfo]];
+                                              body:notification.userInfo];
 }
 
 RCT_EXPORT_METHOD(openURL:(NSURL *)URL)
@@ -72,7 +72,7 @@ RCT_EXPORT_METHOD(canOpenURL:(NSURL *)URL
 - (NSDictionary *)constantsToExport
 {
   NSURL *initialURL = _bridge.launchOptions[UIApplicationLaunchOptionsURLKey];
-  return @{@"initialURL": RCTNullIfNil([initialURL absoluteString])};
+  return @{@"initialURL": RCTNullIfNil(initialURL.absoluteString)};
 }
 
 @end

Libraries/Network/RCTDownloadTask.m

@@ -51,7 +51,7 @@
   _uploadProgressBlock = nil;
 }
 
-RCT_NOT_IMPLEMENTED(-init)
+RCT_NOT_IMPLEMENTED(- (instancetype)init)
 
 - (void)cancel
 {

Libraries/Network/RCTHTTPRequestHandler.m

@@ -47,7 +47,7 @@ RCT_EXPORT_MODULE()
 
 - (BOOL)canHandleRequest:(NSURLRequest *)request
 {
-  return [@[@"http", @"https", @"file"] containsObject:[request.URL.scheme lowercaseString]];
+  return [@[@"http", @"https", @"file"] containsObject:request.URL.scheme.lowercaseString];
 }
 
 - (NSURLSessionDataTask *)sendRequest:(NSURLRequest *)request

Libraries/Network/RCTNetworking.m

@@ -88,7 +88,7 @@ static NSString *RCTGenerateFormBoundary()
   NSMutableDictionary *headers = [parts[0][@"headers"] mutableCopy];
   NSString *partContentType = result[@"contentType"];
   if (partContentType != nil) {
-    [headers setObject:partContentType forKey:@"content-type"];
+    headers[@"content-type"] = partContentType;
   }
   [headers enumerateKeysAndObjectsUsingBlock:^(NSString *parameterKey, NSString *parameterValue, BOOL *stop) {
     [multipartBody appendData:[[NSString stringWithFormat:@"%@: %@\r\n", parameterKey, parameterValue]
@@ -142,7 +142,7 @@ RCT_EXPORT_MODULE()
 {
   NSURL *URL = [RCTConvert NSURL:query[@"url"]]; // this is marked as nullable in JS, but should not be null
   NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:URL];
-  request.HTTPMethod = [[RCTConvert NSString:RCTNilIfNull(query[@"method"])] uppercaseString] ?: @"GET";
+  request.HTTPMethod = [RCTConvert NSString:RCTNilIfNull(query[@"method"])].uppercaseString ?: @"GET";
   request.allHTTPHeaderFields = [RCTConvert NSDictionary:query[@"headers"]];
 
   NSDictionary *data = [RCTConvert NSDictionary:RCTNilIfNull(query[@"data"])];
@@ -161,7 +161,7 @@ RCT_EXPORT_MODULE()
     // Gzip the request body
     if ([request.allHTTPHeaderFields[@"Content-Encoding"] isEqualToString:@"gzip"]) {
       request.HTTPBody = RCTGzipData(request.HTTPBody, -1 /* default */);
-      [request setValue:[@(request.HTTPBody.length) description] forHTTPHeaderField:@"Content-Length"];
+      [request setValue:(@(request.HTTPBody.length)).description forHTTPHeaderField:@"Content-Length"];
     }
 
     block(request);
@@ -195,7 +195,7 @@ RCT_EXPORT_MODULE()
       return NSOrderedSame;
     }
   }];
-  id<RCTURLRequestHandler> handler = [handlers lastObject];
+  id<RCTURLRequestHandler> handler = handlers.lastObject;
   if (!handler) {
     RCTLogError(@"No suitable request handler found for %@", request.URL);
   }

Libraries/PushNotificationIOS/RCTPushNotificationManager.m

@@ -108,13 +108,13 @@ RCT_EXPORT_MODULE()
 - (void)handleRemoteNotificationReceived:(NSNotification *)notification
 {
   [_bridge.eventDispatcher sendDeviceEventWithName:@"remoteNotificationReceived"
-                                              body:[notification userInfo]];
+                                              body:notification.userInfo];
 }
 
 - (void)handleRemoteNotificationsRegistered:(NSNotification *)notification
 {
   [_bridge.eventDispatcher sendDeviceEventWithName:@"remoteNotificationsRegistered"
-                                              body:[notification userInfo]];
+                                              body:notification.userInfo];
 }
 
 /**
@@ -175,7 +175,7 @@ RCT_EXPORT_METHOD(checkPermissions:(RCTResponseSenderBlock)callback)
 {
   NSUInteger types = 0;
   if ([UIApplication instancesRespondToSelector:@selector(currentUserNotificationSettings)]) {
-    types = [[[UIApplication sharedApplication] currentUserNotificationSettings] types];
+    types = [[UIApplication sharedApplication] currentUserNotificationSettings].types;
   } else {
 
 #if __IPHONE_OS_VERSION_MIN_REQUIRED < __IPHONE_8_0

Libraries/RCTTest/FBSnapshotTestCase/UIImage+Compare.m

@@ -65,7 +65,7 @@
                                                     (CGBitmapInfo)kCGImageAlphaPremultipliedLast
                                                     );
     
-  CGFloat scaleFactor = [[UIScreen mainScreen] scale];
+  CGFloat scaleFactor = [UIScreen mainScreen].scale;
   CGContextScaleCTM(referenceImageContext, scaleFactor, scaleFactor);
   CGContextScaleCTM(imageContext, scaleFactor, scaleFactor);
     

Libraries/RCTTest/RCTTestModule.m

@@ -44,7 +44,7 @@ RCT_EXPORT_METHOD(verifySnapshot:(RCTResponseSenderBlock)callback)
   [_bridge.uiManager addUIBlock:^(RCTUIManager *uiManager, RCTSparseArray *viewRegistry) {
 
     NSString *testName = NSStringFromSelector(_testSelector);
-    _snapshotCounter[testName] = [@([_snapshotCounter[testName] integerValue] + 1) stringValue];
+    _snapshotCounter[testName] = (@([_snapshotCounter[testName] integerValue] + 1)).stringValue;
 
     NSError *error = nil;
     BOOL success = [_controller compareSnapshotOfView:_view

Libraries/RCTTest/RCTTestRunner.m

@@ -55,7 +55,7 @@
   return self;
 }
 
-RCT_NOT_IMPLEMENTED(-init)
+RCT_NOT_IMPLEMENTED(- (instancetype)init)
 
 - (void)setRecordMode:(BOOL)recordMode
 {
@@ -109,7 +109,7 @@ RCT_NOT_IMPLEMENTED(-init)
   [vc.view addSubview:rootView]; // Add as subview so it doesn't get resized
 
   NSDate *date = [NSDate dateWithTimeIntervalSinceNow:TIMEOUT_SECONDS];
-  while ([date timeIntervalSinceNow] > 0 && testModule.status == RCTTestStatusPending && error == nil) {
+  while (date.timeIntervalSinceNow > 0 && testModule.status == RCTTestStatusPending && error == nil) {
     [[NSRunLoop mainRunLoop] runMode:NSDefaultRunLoopMode beforeDate:[NSDate dateWithTimeIntervalSinceNow:0.1]];
     [[NSRunLoop mainRunLoop] runMode:NSRunLoopCommonModes beforeDate:[NSDate dateWithTimeIntervalSinceNow:0.1]];
   }

Libraries/Text/RCTShadowText.m

@@ -34,8 +34,8 @@ static css_dim_t RCTMeasure(void *context, float width)
 {
   RCTShadowText *shadowText = (__bridge RCTShadowText *)context;
   NSTextStorage *textStorage = [shadowText buildTextStorageForWidth:width];
-  NSLayoutManager *layoutManager = [textStorage.layoutManagers firstObject];
+  NSLayoutManager *layoutManager = textStorage.layoutManagers.firstObject;
-  NSTextContainer *textContainer = [layoutManager.textContainers firstObject];
+  NSTextContainer *textContainer = layoutManager.textContainers.firstObject;
   CGSize computedSize = [layoutManager usedRectForTextContainer:textContainer].size;
 
   css_dim_t result;
@@ -190,7 +190,7 @@ static css_dim_t RCTMeasure(void *context, float width)
       [attributedString appendAttributedString:[shadowText _attributedStringWithFontFamily:fontFamily fontSize:fontSize fontWeight:fontWeight fontStyle:fontStyle letterSpacing:letterSpacing useBackgroundColor:YES]];
     } else if ([child isKindOfClass:[RCTShadowRawText class]]) {
       RCTShadowRawText *shadowRawText = (RCTShadowRawText *)child;
-      [attributedString appendAttributedString:[[NSAttributedString alloc] initWithString:[shadowRawText text] ?: @""]];
+      [attributedString appendAttributedString:[[NSAttributedString alloc] initWithString:shadowRawText.text ?: @""]];
     } else {
       RCTLogError(@"<Text> can't have any children except <Text> or raw strings");
     }
@@ -225,7 +225,7 @@ static css_dim_t RCTMeasure(void *context, float width)
 
 - (void)_addAttribute:(NSString *)attribute withValue:(id)attributeValue toAttributedString:(NSMutableAttributedString *)attributedString
 {
-  [attributedString enumerateAttribute:attribute inRange:NSMakeRange(0, [attributedString length]) options:0 usingBlock:^(id value, NSRange range, BOOL *stop) {
+  [attributedString enumerateAttribute:attribute inRange:NSMakeRange(0, attributedString.length) options:0 usingBlock:^(id value, NSRange range, BOOL *stop) {
     if (!value && attributeValue) {
       [attributedString addAttribute:attribute value:attributeValue range:range];
     }
@@ -249,10 +249,10 @@ static css_dim_t RCTMeasure(void *context, float width)
   }
 
   // check for lineHeight on each of our children, update the max as we go (in self.lineHeight)
-  [attributedString enumerateAttribute:NSParagraphStyleAttributeName inRange:NSMakeRange(0, [attributedString length]) options:0 usingBlock:^(id value, NSRange range, BOOL *stop) {
+  [attributedString enumerateAttribute:NSParagraphStyleAttributeName inRange:(NSRange){0, attributedString.length} options:0 usingBlock:^(id value, NSRange range, BOOL *stop) {
     if (value) {
       NSParagraphStyle *paragraphStyle = (NSParagraphStyle *)value;
-      CGFloat maximumLineHeight = round([paragraphStyle maximumLineHeight] / self.fontSizeMultiplier);
+      CGFloat maximumLineHeight = round(paragraphStyle.maximumLineHeight / self.fontSizeMultiplier);
       if (maximumLineHeight > self.lineHeight) {
         self.lineHeight = maximumLineHeight;
       }
@@ -305,13 +305,13 @@ static css_dim_t RCTMeasure(void *context, float width)
 - (void)insertReactSubview:(RCTShadowView *)subview atIndex:(NSInteger)atIndex
 {
   [super insertReactSubview:subview atIndex:atIndex];
-  [self cssNode]->children_count = 0;
+  self.cssNode->children_count = 0;
 }
 
 - (void)removeReactSubview:(RCTShadowView *)subview
 {
   [super removeReactSubview:subview];
-  [self cssNode]->children_count = 0;
+  self.cssNode->children_count = 0;
 }
 
 - (void)setBackgroundColor:(UIColor *)backgroundColor
@@ -348,7 +348,7 @@ RCT_TEXT_PROPERTY(WritingDirection, _writingDirection, NSWritingDirection)
   _allowFontScaling = allowFontScaling;
   for (RCTShadowView *child in [self reactSubviews]) {
     if ([child isKindOfClass:[RCTShadowText class]]) {
-      [(RCTShadowText *)child setAllowFontScaling:allowFontScaling];
+      ((RCTShadowText *)child).allowFontScaling = allowFontScaling;
     }
   }
   [self dirtyText];
@@ -359,7 +359,7 @@ RCT_TEXT_PROPERTY(WritingDirection, _writingDirection, NSWritingDirection)
   _fontSizeMultiplier = fontSizeMultiplier;
   for (RCTShadowView *child in [self reactSubviews]) {
     if ([child isKindOfClass:[RCTShadowText class]]) {
-      [(RCTShadowText *)child setFontSizeMultiplier:fontSizeMultiplier];
+      ((RCTShadowText *)child).fontSizeMultiplier = fontSizeMultiplier;
     }
   }
   [self dirtyText];

Libraries/Text/RCTText.m

@@ -75,8 +75,8 @@
 
 - (void)drawRect:(CGRect)rect
 {
-  NSLayoutManager *layoutManager = [_textStorage.layoutManagers firstObject];
+  NSLayoutManager *layoutManager = _textStorage.layoutManagers.firstObject;
-  NSTextContainer *textContainer = [layoutManager.textContainers firstObject];
+  NSTextContainer *textContainer = layoutManager.textContainers.firstObject;
   CGRect textFrame = UIEdgeInsetsInsetRect(self.bounds, _contentInset);
   NSRange glyphRange = [layoutManager glyphRangeForTextContainer:textContainer];
 
@@ -119,8 +119,8 @@
   NSNumber *reactTag = self.reactTag;
 
   CGFloat fraction;
-  NSLayoutManager *layoutManager = [_textStorage.layoutManagers firstObject];
+  NSLayoutManager *layoutManager = _textStorage.layoutManagers.firstObject;
-  NSTextContainer *textContainer = [layoutManager.textContainers firstObject];
+  NSTextContainer *textContainer = layoutManager.textContainers.firstObject;
   NSUInteger characterIndex = [layoutManager characterIndexForPoint:point
                                                     inTextContainer:textContainer
                            fractionOfDistanceBetweenInsertionPoints:&fraction];

Libraries/Text/RCTTextField.m

@@ -36,15 +36,15 @@
   return self;
 }
 
-RCT_NOT_IMPLEMENTED(-initWithFrame:(CGRect)frame)
+RCT_NOT_IMPLEMENTED(- (instancetype)initWithFrame:(CGRect)frame)
-RCT_NOT_IMPLEMENTED(-initWithCoder:(NSCoder *)aDecoder)
+RCT_NOT_IMPLEMENTED(- (instancetype)initWithCoder:(NSCoder *)aDecoder)
 
 - (void)setText:(NSString *)text
 {
   NSInteger eventLag = _nativeEventCount - _mostRecentEventCount;
   if (eventLag == 0 && ![text isEqualToString:self.text]) {
     UITextRange *selection = self.selectedTextRange;
-    [super setText:text];
+    super.text = text;
     self.selectedTextRange = selection; // maintain cursor position/selection - this is robust to out of bounds
   } else if (eventLag > RCTTextUpdateLagWarningThreshold) {
     RCTLogWarn(@"Native TextInput(%@) is %zd events ahead of JS - try to make your JS faster.", self.text, eventLag);

Libraries/Text/RCTTextManager.m

@@ -66,12 +66,12 @@ RCT_EXPORT_SHADOW_PROPERTY(allowFontScaling, BOOL)
     }
 
     NSMutableArray *queue = [NSMutableArray arrayWithObject:rootView];
-    for (NSInteger i = 0; i < [queue count]; i++) {
+    for (NSInteger i = 0; i < queue.count; i++) {
       RCTShadowView *shadowView = queue[i];
       RCTAssert([shadowView isTextDirty], @"Don't process any nodes that don't have dirty text");
 
       if ([shadowView isKindOfClass:[RCTShadowText class]]) {
-        [(RCTShadowText *)shadowView setFontSizeMultiplier:self.bridge.accessibilityManager.multiplier];
+        ((RCTShadowText *)shadowView).fontSizeMultiplier = self.bridge.accessibilityManager.multiplier;
         [(RCTShadowText *)shadowView recomputeText];
       } else if ([shadowView isKindOfClass:[RCTShadowRawText class]]) {
         RCTLogError(@"Raw text cannot be used outside of a <Text> tag. Not rendering string: '%@'",

Libraries/Text/RCTTextView.m

@@ -41,8 +41,8 @@
   return self;
 }
 
-RCT_NOT_IMPLEMENTED(-initWithFrame:(CGRect)frame)
+RCT_NOT_IMPLEMENTED(- (instancetype)initWithFrame:(CGRect)frame)
-RCT_NOT_IMPLEMENTED(-initWithCoder:(NSCoder *)aDecoder)
+RCT_NOT_IMPLEMENTED(- (instancetype)initWithCoder:(NSCoder *)aDecoder)
 
 - (void)updateFrames
 {
@@ -166,7 +166,7 @@ RCT_NOT_IMPLEMENTED(-initWithCoder:(NSCoder *)aDecoder)
   NSInteger eventLag = _nativeEventCount - _mostRecentEventCount;
   if (eventLag == 0 && ![text isEqualToString:_textView.text]) {
     UITextRange *selection = _textView.selectedTextRange;
-    [_textView setText:text];
+    _textView.text = text;
     [self _setPlaceholderVisibility];
     _textView.selectedTextRange = selection; // maintain cursor position/selection - this is robust to out of bounds
   } else if (eventLag > RCTTextUpdateLagWarningThreshold) {

Libraries/WebSocket/RCTSRWebSocket.h

@@ -17,14 +17,14 @@
 #import <Foundation/Foundation.h>
 #import <Security/SecCertificate.h>
 
-typedef enum {
+typedef NS_ENUM(unsigned int, RCTSRReadyState) {
     RCTSR_CONNECTING   = 0,
     RCTSR_OPEN         = 1,
     RCTSR_CLOSING      = 2,
     RCTSR_CLOSED       = 3,
-} RCTSRReadyState;
+};
 
-typedef enum RCTSRStatusCode : NSInteger {
+typedef NS_ENUM(NSInteger, RCTSRStatusCode) {
     RCTSRStatusCodeNormal = 1000,
     RCTSRStatusCodeGoingAway = 1001,
     RCTSRStatusCodeProtocolError = 1002,
@@ -35,7 +35,7 @@ typedef enum RCTSRStatusCode : NSInteger {
     RCTSRStatusCodeInvalidUTF8 = 1007,
     RCTSRStatusCodePolicyViolated = 1008,
     RCTSRStatusCodeMessageTooBig = 1009,
-} RCTSRStatusCode;
+};
 
 @class RCTSRWebSocket;
 

Libraries/WebSocket/RCTSRWebSocket.m

@@ -53,14 +53,14 @@ static inline void RCTSRFastLog(NSString *format, ...);
 
 @interface NSData (RCTSRWebSocket)
 
-- (NSString *)stringBySHA1ThenBase64Encoding;
+@property (nonatomic, readonly, copy) NSString *stringBySHA1ThenBase64Encoding;
 
 @end
 
 
 @interface NSString (RCTSRWebSocket)
 
-- (NSString *)stringBySHA1ThenBase64Encoding;
+@property (nonatomic, readonly, copy) NSString *stringBySHA1ThenBase64Encoding;
 
 @end
 
@@ -69,7 +69,7 @@ static inline void RCTSRFastLog(NSString *format, ...);
 
 // The origin isn't really applicable for a native application.
 // So instead, just map ws -> http and wss -> https.
-- (NSString *)RCTSR_origin;
+@property (nonatomic, readonly, copy) NSString *RCTSR_origin;
 
 @end
 
@@ -259,7 +259,7 @@ static __strong NSData *CRLFCRLF;
   return self;
 }
 
-RCT_NOT_IMPLEMENTED(-init)
+RCT_NOT_IMPLEMENTED(- (instancetype)init)
 
 - (instancetype)initWithURLRequest:(NSURLRequest *)request;
 {
@@ -511,7 +511,7 @@ RCT_NOT_IMPLEMENTED(-init)
     [_outputStream setProperty:(__bridge id)kCFStreamSocketSecurityLevelNegotiatedSSL forKey:(__bridge id)kCFStreamPropertySocketSecurityLevel];
 
     // If we're using pinned certs, don't validate the certificate chain
-    if ([_urlRequest RCTSR_SSLPinnedCertificates].count) {
+    if (_urlRequest.RCTSR_SSLPinnedCertificates.count) {
       [SSLOptions setValue:@NO forKey:(__bridge id)kCFStreamSSLValidatesCertificateChain];
     }
 
@@ -998,7 +998,7 @@ static const uint8_t RCTSRPayloadLenMask   = 0x7F;
 - (void)_readFrameNew;
 {
   dispatch_async(_workQueue, ^{
-    [_currentFrameData setLength:0];
+    _currentFrameData.length = 0;
 
     _currentFrameOpcode = 0;
     _currentFrameCount = 0;
@@ -1253,7 +1253,7 @@ static const size_t RCTSRFrameHeaderOverhead = 32;
     [self closeWithCode:RCTSRStatusCodeMessageTooBig reason:@"Message too big"];
     return;
   }
-  uint8_t *frame_buffer = (uint8_t *)[frame mutableBytes];
+  uint8_t *frame_buffer = (uint8_t *)frame.mutableBytes;
 
   // set fin
   frame_buffer[0] = RCTSRFinMask | opcode;
@@ -1318,7 +1318,7 @@ static const size_t RCTSRFrameHeaderOverhead = 32;
 {
   if (_secure && !_pinnedCertFound && (eventCode == NSStreamEventHasBytesAvailable || eventCode == NSStreamEventHasSpaceAvailable)) {
 
-    NSArray *sslCerts = [_urlRequest RCTSR_SSLPinnedCertificates];
+    NSArray *sslCerts = _urlRequest.RCTSR_SSLPinnedCertificates;
     if (sslCerts) {
       SecTrustRef secTrust = (__bridge SecTrustRef)[aStream propertyForKey:(__bridge id)kCFStreamPropertySSLPeerTrust];
       if (secTrust) {
@@ -1366,11 +1366,11 @@ static const size_t RCTSRFrameHeaderOverhead = 32;
       }
 
       case NSStreamEventErrorOccurred: {
-        RCTSRFastLog(@"NSStreamEventErrorOccurred %@ %@", aStream, [[aStream streamError] copy]);
+        RCTSRFastLog(@"NSStreamEventErrorOccurred %@ %@", aStream, [aStream.streamError copy]);
         // TODO: specify error better!
         [self _failWithError:aStream.streamError];
         _readBufferOffset = 0;
-        [_readBuffer setLength:0];
+        _readBuffer.length = 0;
         break;
 
       }
@@ -1475,7 +1475,7 @@ static const size_t RCTSRFrameHeaderOverhead = 32;
 {
   RCTSRIOConsumer *consumer = nil;
   if (_bufferedConsumers.count) {
-    consumer = [_bufferedConsumers lastObject];
+    consumer = _bufferedConsumers.lastObject;
     [_bufferedConsumers removeLastObject];
   } else {
     consumer = [RCTSRIOConsumer new];
@@ -1522,7 +1522,7 @@ static const size_t RCTSRFrameHeaderOverhead = 32;
 
 - (NSString *)RCTSR_origin;
 {
-  NSString *scheme = [self.scheme lowercaseString];
+  NSString *scheme = self.scheme.lowercaseString;
 
   if ([scheme isEqualToString:@"wss"]) {
     scheme = @"https";

Libraries/WebSocket/RCTWebSocketExecutor.m

@@ -152,7 +152,7 @@ RCT_EXPORT_MODULE()
 {
   NSDictionary *message = @{
     @"method": @"executeApplicationScript",
-    @"url": RCTNullIfNil([URL absoluteString]),
+    @"url": RCTNullIfNil(URL.absoluteString),
     @"inject": _injectedObjects,
   };
   [self sendMessage:message waitForReply:^(NSError *error, NSDictionary *reply) {

Libraries/WebSocket/RCTWebSocketManager.m

@@ -98,7 +98,7 @@ RCT_EXPORT_METHOD(close:(nonnull NSNumber *)socketID)
 - (void)webSocket:(RCTSRWebSocket *)webSocket didFailWithError:(NSError *)error
 {
   [_bridge.eventDispatcher sendDeviceEventWithName:@"websocketFailed" body:@{
-    @"message":[error localizedDescription],
+    @"message":error.localizedDescription,
     @"id": webSocket.reactTag
   }];
 }

React/Base/RCTAssert.m

@@ -60,7 +60,7 @@ static RCTAssertFunction RCTGetLocalAssertFunction()
 {
   NSMutableDictionary *threadDictionary = [NSThread currentThread].threadDictionary;
   NSArray *functionStack = threadDictionary[RCTAssertFunctionStack];
-  RCTAssertFunction assertFunction = [functionStack lastObject];
+  RCTAssertFunction assertFunction = functionStack.lastObject;
   if (assertFunction) {
     return assertFunction;
   }
@@ -83,7 +83,7 @@ void RCTPerformBlockWithAssertFunction(void (^block)(void), RCTAssertFunction as
 NSString *RCTCurrentThreadName(void)
 {
   NSThread *thread = [NSThread currentThread];
-  NSString *threadName = [thread isMainThread] ? @"main" : thread.name;
+  NSString *threadName = thread.isMainThread ? @"main" : thread.name;
   if (threadName.length == 0) {
     const char *label = dispatch_queue_get_label(DISPATCH_CURRENT_QUEUE_LABEL);
     if (label && strlen(label) > 0) {

React/Base/RCTBatchedBridge.m

@@ -118,7 +118,7 @@ RCT_EXTERN NSArray *RCTGetModuleClasses(void);
   dispatch_group_t initModulesAndLoadSource = dispatch_group_create();
   dispatch_group_enter(initModulesAndLoadSource);
   __block NSString *sourceCode;
-  [self loadSource:^(NSError *error, NSString *source) {
+  [self loadSource:^(__unused NSError *error, NSString *source) {
     sourceCode = source;
     dispatch_group_leave(initModulesAndLoadSource);
   }];
@@ -174,7 +174,7 @@ RCT_EXTERN NSArray *RCTGetModuleClasses(void);
     RCTPerformanceLoggerEnd(RCTPLScriptDownload);
 
     if (error) {
-      NSArray *stack = [error userInfo][@"stack"];
+      NSArray *stack = error.userInfo[@"stack"];
       if (stack) {
         [self.redBox showErrorMessage:error.localizedDescription
                             withStack:stack];
@@ -353,7 +353,7 @@ RCT_EXTERN NSArray *RCTGetModuleClasses(void);
 }
 
 
-RCT_NOT_IMPLEMENTED(-initWithBundleURL:(__unused NSURL *)bundleURL
+RCT_NOT_IMPLEMENTED(- (instancetype)initWithBundleURL:(__unused NSURL *)bundleURL
                     moduleProvider:(__unused RCTBridgeModuleProviderBlock)block
                     launchOptions:(__unused NSDictionary *)launchOptions)
 
@@ -634,7 +634,7 @@ RCT_NOT_IMPLEMENTED(-initWithBundleURL:(__unused NSURL *)bundleURL
   }
 
   for (NSUInteger fieldIndex = RCTBridgeFieldRequestModuleIDs; fieldIndex <= RCTBridgeFieldParamss; fieldIndex++) {
-    id field = [requestsArray objectAtIndex:fieldIndex];
+    id field = requestsArray[fieldIndex];
     if (![field isKindOfClass:[NSArray class]]) {
       RCTLogError(@"Field at index %zd in buffer must be an instance of NSArray, got %@", fieldIndex, NSStringFromClass([field class]));
       return;
@@ -647,7 +647,7 @@ RCT_NOT_IMPLEMENTED(-initWithBundleURL:(__unused NSURL *)bundleURL
   NSArray *methodIDs = requestsArray[RCTBridgeFieldMethodIDs];
   NSArray *paramsArrays = requestsArray[RCTBridgeFieldParamss];
 
-  NSUInteger numRequests = [moduleIDs count];
+  NSUInteger numRequests = moduleIDs.count;
 
   if (RCT_DEBUG && (numRequests != methodIDs.count || numRequests != paramsArrays.count)) {
     RCTLogError(@"Invalid data message - all must be length: %zd", numRequests);
@@ -761,7 +761,7 @@ RCT_NOT_IMPLEMENTED(-initWithBundleURL:(__unused NSURL *)bundleURL
   RCTFrameUpdate *frameUpdate = [[RCTFrameUpdate alloc] initWithDisplayLink:displayLink];
   for (RCTModuleData *moduleData in _frameUpdateObservers) {
     id<RCTFrameUpdateObserver> observer = (id<RCTFrameUpdateObserver>)moduleData.instance;
-    if (![observer respondsToSelector:@selector(isPaused)] || ![observer isPaused]) {
+    if (![observer respondsToSelector:@selector(isPaused)] || !observer.paused) {
       RCT_IF_DEV(NSString *name = [NSString stringWithFormat:@"[%@ didUpdateFrame:%f]", observer, displayLink.timestamp];)
       RCTProfileBeginFlowEvent();
 

React/Base/RCTBridge.m

@@ -75,7 +75,7 @@ NSString *RCTBridgeModuleNameForClass(Class cls)
   if ([cls respondsToSelector:NSSelectorFromString(@"moduleName")]) {
     name = [cls valueForKey:@"moduleName"];
   }
-  if ([name length] == 0) {
+  if (name.length == 0) {
     name = NSStringFromClass(cls);
   }
   if ([name hasPrefix:@"RK"]) {
@@ -192,7 +192,7 @@ static RCTBridge *RCTCurrentBridgeInstance = nil;
   return self;
 }
 
-RCT_NOT_IMPLEMENTED(-init)
+RCT_NOT_IMPLEMENTED(- (instancetype)init)
 
 - (void)dealloc
 {

React/Base/RCTCache.m

@@ -52,7 +52,7 @@
   NSLock *_lock;
 }
 
-- (id)init
+- (instancetype)init
 {
   if ((self = [super init]))
   {
@@ -103,7 +103,7 @@
 
 - (NSUInteger)count
 {
-  return [_cache count];
+  return _cache.count;
 }
 
 - (void)cleanUp:(BOOL)keepEntries
@@ -162,7 +162,7 @@
   [_lock lock];
   if (_delegateRespondsToShouldEvictObject || _delegateRespondsToWillEvictObject)
   {
-    NSArray *keys = [_cache allKeys];
+    NSArray *keys = _cache.allKeys;
     if (_delegateRespondsToShouldEvictObject)
     {
       //sort, oldest first (in case we want to use that information in our eviction test)
@@ -202,7 +202,7 @@
 - (void)resequence
 {
   //sort, oldest first
-  NSArray *entries = [[_cache allValues] sortedArrayUsingComparator:^NSComparisonResult(RCTCacheEntry *entry1, RCTCacheEntry *entry2) {
+  NSArray *entries = [_cache.allValues sortedArrayUsingComparator:^NSComparisonResult(RCTCacheEntry *entry1, RCTCacheEntry *entry2) {
     return (NSComparisonResult)MIN(1, MAX(-1, entry1.sequenceNumber - entry2.sequenceNumber));
   }];
 

React/Base/RCTConvert.h

@@ -80,10 +80,10 @@ typedef NSURL RCTFileURL;
 + (CGAffineTransform)CGAffineTransform:(id)json;
 
 + (UIColor *)UIColor:(id)json;
-+ (CGColorRef)CGColor:(id)json;
++ (CGColorRef)CGColor:(id)json CF_RETURNS_NOT_RETAINED;
 
 + (UIImage *)UIImage:(id)json;
-+ (CGImageRef)CGImage:(id)json;
++ (CGImageRef)CGImage:(id)json CF_RETURNS_NOT_RETAINED;
 
 + (UIFont *)UIFont:(id)json;
 + (UIFont *)UIFont:(UIFont *)font withSize:(id)json;

React/Base/RCTConvert.m

@@ -95,13 +95,13 @@ RCT_CUSTOM_CONVERTER(NSData *, NSData, [json dataUsingEncoding:NSUTF8StringEncod
     }
 
     // Assume that it's a local path
-    path = [path stringByRemovingPercentEncoding];
+    path = path.stringByRemovingPercentEncoding;
     if ([path hasPrefix:@"~"]) {
       // Path is inside user directory
-      path = [path stringByExpandingTildeInPath];
+      path = path.stringByExpandingTildeInPath;
-    } else if (![path isAbsolutePath]) {
+    } else if (!path.absolutePath) {
       // Assume it's a resource path
-      path = [[[NSBundle mainBundle] resourcePath] stringByAppendingPathComponent:path];
+      path = [[NSBundle mainBundle].resourcePath stringByAppendingPathComponent:path];
     }
     return [NSURL fileURLWithPath:path];
   }
@@ -120,7 +120,7 @@ RCT_CUSTOM_CONVERTER(NSData *, NSData, [json dataUsingEncoding:NSUTF8StringEncod
 + (RCTFileURL *)RCTFileURL:(id)json
 {
   NSURL *fileURL = [self NSURL:json];
-  if (![fileURL isFileURL]) {
+  if (!fileURL.fileURL) {
     RCTLogError(@"URI must be a local file, '%@' isn't.", fileURL);
     return nil;
   }
@@ -168,8 +168,8 @@ NSNumber *RCTConvertEnumValue(const char *typeName, NSDictionary *mapping, NSNum
     return defaultValue;
   }
   if ([json isKindOfClass:[NSNumber class]]) {
-    NSArray *allValues = [mapping allValues];
+    NSArray *allValues = mapping.allValues;
-    if ([[mapping allValues] containsObject:json] || [json isEqual:defaultValue]) {
+    if ([mapping.allValues containsObject:json] || [json isEqual:defaultValue]) {
       return json;
     }
     RCTLogError(@"Invalid %s '%@'. should be one of: %@", typeName, json, allValues);
@@ -195,7 +195,7 @@ NSNumber *RCTConvertMultiEnumValue(const char *typeName, NSDictionary *mapping,
     long long result = 0;
     for (id arrayElement in json) {
       NSNumber *value = RCTConvertEnumValue(typeName, mapping, defaultValue, arrayElement);
-      result |= [value longLongValue];
+      result |= value.longLongValue;
     }
     return @(result);
   }
@@ -582,7 +582,7 @@ RCT_CGSTRUCT_CONVERTER(CGAffineTransform, (@[
     if ([colorString hasPrefix:@"#"]) {
       uint32_t redInt = 0, greenInt = 0, blueInt = 0;
       if (colorString.length == 4) { // 3 digit hex
-        sscanf([colorString UTF8String], "#%01x%01x%01x", &redInt, &greenInt, &blueInt);
+        sscanf(colorString.UTF8String, "#%01x%01x%01x", &redInt, &greenInt, &blueInt);
         // expand to 6 digit hex
         components.rgb.r = redInt / 15.0;
         components.rgb.g = greenInt / 15.0;
@@ -694,10 +694,10 @@ RCT_CGSTRUCT_CONVERTER(CGAffineTransform, (@[
   }
 
   NSURL *URL = [self NSURL:path];
-  NSString *scheme = [URL.scheme lowercaseString];
+  NSString *scheme = URL.scheme.lowercaseString;
   if (path && [scheme isEqualToString:@"file"]) {
     if (RCT_DEBUG || [NSThread currentThread] == [NSThread mainThread]) {
-      if ([URL.path hasPrefix:[[NSBundle mainBundle] resourcePath]]) {
+      if ([URL.path hasPrefix:[NSBundle mainBundle].resourcePath]) {
         // Image may reside inside a .car file, in which case we have no choice
         // but to use +[UIImage imageNamed] - but this method isn't thread safe
         static NSMutableDictionary *XCAssetMap = nil;
@@ -722,7 +722,7 @@ RCT_CGSTRUCT_CONVERTER(CGAffineTransform, (@[
 
     if (!image) {
       // Attempt to load from the file system
-      if ([path pathExtension].length == 0) {
+      if (path.pathExtension.length == 0) {
         path = [path stringByAppendingPathExtension:@"png"];
       }
       image = [UIImage imageWithContentsOfFile:path];

React/Base/RCTEventDispatcher.m

@@ -29,7 +29,7 @@ NSString *RCTNormalizeInputEventName(NSString *eventName)
 static NSNumber *RCTGetEventID(id<RCTEvent> event)
 {
   return @(
-    [event.viewTag intValue] |
+    event.viewTag.intValue |
     (((uint64_t)event.eventName.hash & 0xFFFF) << 32)  |
     (((uint64_t)event.coalescingKey) << 48)
   );
@@ -57,7 +57,7 @@ static NSNumber *RCTGetEventID(id<RCTEvent> event)
   return self;
 }
 
-RCT_NOT_IMPLEMENTED(-init)
+RCT_NOT_IMPLEMENTED(- (instancetype)init)
 
 - (uint16_t)coalescingKey
 {

React/Base/RCTFPSGraph.m

@@ -56,8 +56,8 @@
   return self;
 }
 
-RCT_NOT_IMPLEMENTED(-initWithFrame:(CGRect)frame)
+RCT_NOT_IMPLEMENTED(- (instancetype)initWithFrame:(CGRect)frame)
-RCT_NOT_IMPLEMENTED(-initWithCoder:(NSCoder *)aDecoder)
+RCT_NOT_IMPLEMENTED(- (instancetype)initWithCoder:(NSCoder *)aDecoder)
 
 - (void)dealloc
 {
@@ -74,8 +74,8 @@ RCT_NOT_IMPLEMENTED(-initWithCoder:(NSCoder *)aDecoder)
   CGFloat left = _position & RCTFPSGraphPositionLeft ? 0 : _length;
   CAShapeLayer *graph = [CAShapeLayer new];
   graph.frame = CGRectMake(left, 0, 2 * _margin + _length, self.frame.size.height);
-  graph.backgroundColor = [[color colorWithAlphaComponent:.2] CGColor];
+  graph.backgroundColor = [color colorWithAlphaComponent:0.2].CGColor;
-  graph.fillColor = [color CGColor];
+  graph.fillColor = color.CGColor;
   return graph;
 }
 

React/Base/RCTFrameUpdate.m

@@ -15,7 +15,7 @@
 
 @implementation RCTFrameUpdate
 
-RCT_NOT_IMPLEMENTED(-init)
+RCT_NOT_IMPLEMENTED(- (instancetype)init)
 
 - (instancetype)initWithDisplayLink:(CADisplayLink *)displayLink
 {

React/Base/RCTJavaScriptLoader.m

@@ -16,7 +16,7 @@
 
 @implementation RCTJavaScriptLoader
 
-RCT_NOT_IMPLEMENTED(-init)
+RCT_NOT_IMPLEMENTED(- (instancetype)init)
 
 + (void)loadBundleAtURL:(NSURL *)scriptURL onComplete:(RCTSourceLoadBlock)onComplete
 {
@@ -24,7 +24,7 @@ RCT_NOT_IMPLEMENTED(-init)
   scriptURL = [RCTConvert NSURL:scriptURL.absoluteString];
 
   if (!scriptURL ||
-      ([scriptURL isFileURL] && ![[NSFileManager defaultManager] fileExistsAtPath:scriptURL.path])) {
+      (scriptURL.fileURL && ![[NSFileManager defaultManager] fileExistsAtPath:scriptURL.path])) {
     NSError *error = [NSError errorWithDomain:@"JavaScriptLoader" code:1 userInfo:@{
       NSLocalizedDescriptionKey: scriptURL ? [NSString stringWithFormat:@"Script at '%@' could not be found.", scriptURL] : @"No script URL provided"
     }];
@@ -37,11 +37,11 @@ RCT_NOT_IMPLEMENTED(-init)
 
     // Handle general request errors
     if (error) {
-      if ([[error domain] isEqualToString:NSURLErrorDomain]) {
+      if ([error.domain isEqualToString:NSURLErrorDomain]) {
-        NSString *desc = [@"Could not connect to development server. Ensure node server is running and available on the same network - run 'npm start' from react-native root\n\nURL: " stringByAppendingString:[scriptURL absoluteString]];
+        NSString *desc = [@"Could not connect to development server. Ensure node server is running and available on the same network - run 'npm start' from react-native root\n\nURL: " stringByAppendingString:scriptURL.absoluteString];
         NSDictionary *userInfo = @{
           NSLocalizedDescriptionKey: desc,
-          NSLocalizedFailureReasonErrorKey: [error localizedDescription],
+          NSLocalizedFailureReasonErrorKey: error.localizedDescription,
           NSUnderlyingErrorKey: error,
         };
         error = [NSError errorWithDomain:@"JSServer"
@@ -63,7 +63,7 @@ RCT_NOT_IMPLEMENTED(-init)
     NSString *rawText = [[NSString alloc] initWithData:data encoding:encoding];
 
     // Handle HTTP errors
-    if ([response isKindOfClass:[NSHTTPURLResponse class]] && [(NSHTTPURLResponse *)response statusCode] != 200) {
+    if ([response isKindOfClass:[NSHTTPURLResponse class]] && ((NSHTTPURLResponse *)response).statusCode != 200) {
       NSDictionary *userInfo;
       NSDictionary *errorDetails = RCTJSONParse(rawText, nil);
       if ([errorDetails isKindOfClass:[NSDictionary class]] &&
@@ -84,7 +84,7 @@ RCT_NOT_IMPLEMENTED(-init)
         userInfo = @{NSLocalizedDescriptionKey: rawText};
       }
       error = [NSError errorWithDomain:@"JSServer"
-                                  code:[(NSHTTPURLResponse *)response statusCode]
+                                  code:((NSHTTPURLResponse *)response).statusCode
                               userInfo:userInfo];
 
       onComplete(error, nil);

React/Base/RCTKeyCommands.m

@@ -40,7 +40,7 @@ static BOOL RCTIsIOS8OrEarlier()
   return self;
 }
 
-RCT_NOT_IMPLEMENTED(-init)
+RCT_NOT_IMPLEMENTED(- (instancetype)init)
 
 - (id)copyWithZone:(__unused NSZone *)zone
 {

React/Base/RCTLog.m

@@ -116,7 +116,7 @@ static RCTLogFunction RCTGetLocalLogFunction()
 {
   NSMutableDictionary *threadDictionary = [NSThread currentThread].threadDictionary;
   NSArray *functionStack = threadDictionary[RCTLogFunctionStack];
-  RCTLogFunction logFunction = [functionStack lastObject];
+  RCTLogFunction logFunction = functionStack.lastObject;
   if (logFunction) {
     return logFunction;
   }
@@ -171,7 +171,7 @@ NSString *RCTFormatLog(
   [log appendFormat:@"[tid:%@]", RCTCurrentThreadName()];
 
   if (fileName) {
-    fileName = [fileName lastPathComponent];
+    fileName = fileName.lastPathComponent;
     if (lineNumber) {
       [log appendFormat:@"[%@:%@]", fileName, lineNumber];
     } else {
@@ -219,7 +219,7 @@ void _RCTLogFormat(
           NSRange addressRange = [frameSymbols rangeOfString:address];
           NSString *methodName = [frameSymbols substringFromIndex:(addressRange.location + addressRange.length + 1)];
           if (idx == 1) {
-            NSString *file = [[@(fileName) componentsSeparatedByString:@"/"] lastObject];
+            NSString *file = [@(fileName) componentsSeparatedByString:@"/"].lastObject;
             [stack addObject:@{@"methodName": methodName, @"file": file, @"lineNumber": @(lineNumber)}];
           } else {
             [stack addObject:@{@"methodName": methodName}];

React/Base/RCTModuleData.m

@@ -38,13 +38,12 @@
     }
 
     // Must be done at init time due to race conditions
-    // Also, the queue setup isn't thread safe due ti static name cache
+    (void)self.queue;
-    [self queue];
   }
   return self;
 }
 
-RCT_NOT_IMPLEMENTED(-init);
+RCT_NOT_IMPLEMENTED(- (instancetype)init);
 
 - (NSArray *)methods
 {
@@ -101,7 +100,7 @@ RCT_NOT_IMPLEMENTED(-init);
   if (!_queue) {
     BOOL implementsMethodQueue = [_instance respondsToSelector:@selector(methodQueue)];
     if (implementsMethodQueue) {
-      _queue = [_instance methodQueue];
+      _queue = _instance.methodQueue;
     }
     if (!_queue) {
 

React/Base/RCTModuleMap.m

@@ -19,9 +19,9 @@
   NSDictionary *_modulesByName;
 }
 
-RCT_NOT_IMPLEMENTED(-init)
+RCT_NOT_IMPLEMENTED(- (instancetype)init)
-RCT_NOT_IMPLEMENTED(-initWithCoder:aDecoder)
+RCT_NOT_IMPLEMENTED(- (instancetype)initWithCoder:aDecoder)
-RCT_NOT_IMPLEMENTED(-initWithObjects:(const id [])objects
+RCT_NOT_IMPLEMENTED(- (instancetype)initWithObjects:(const id [])objects
                                             forKeys:(const id<NSCopying> [])keys
                                               count:(NSUInteger)cnt)
 

React/Base/RCTModuleMethod.m

@@ -60,7 +60,7 @@ static void RCTLogArgumentError(RCTModuleMethod *method, NSUInteger index,
               method->_JSMethodName, issue);
 }
 
-RCT_NOT_IMPLEMENTED(-init)
+RCT_NOT_IMPLEMENTED(- (instancetype)init)
 
 void RCTParseObjCMethodName(NSString **, NSArray **);
 void RCTParseObjCMethodName(NSString **objCMethodName, NSArray **arguments)
@@ -154,7 +154,7 @@ void RCTParseObjCMethodName(NSString **objCMethodName, NSArray **arguments)
   NSMethodSignature *methodSignature = [_moduleClass instanceMethodSignatureForSelector:_selector];
   RCTAssert(methodSignature, @"%@ is not a recognized Objective-C method.", objCMethodName);
   NSInvocation *invocation = [NSInvocation invocationWithMethodSignature:methodSignature];
-  [invocation setSelector:_selector];
+  invocation.selector = _selector;
   [invocation retainArguments];
   _invocation = invocation;
 
@@ -234,8 +234,8 @@ void RCTParseObjCMethodName(NSString **objCMethodName, NSArray **arguments)
 
           NSMethodSignature *typeSignature = [RCTConvert methodSignatureForSelector:selector];
           NSInvocation *typeInvocation = [NSInvocation invocationWithMethodSignature:typeSignature];
-          [typeInvocation setSelector:selector];
+          typeInvocation.selector = selector;
-          [typeInvocation setTarget:[RCTConvert class]];
+          typeInvocation.target = [RCTConvert class];
 
           [argumentBlocks addObject:^(__unused RCTBridge *bridge, NSUInteger index, id json) {
             void *returnValue = malloc(typeSignature.methodReturnLength);

React/Base/RCTPerfStats.m

@@ -66,7 +66,7 @@ RCT_EXPORT_MODULE()
 
 - (void)show
 {
-  UIView *targetView = [[[[[UIApplication sharedApplication] delegate] window] rootViewController] view];
+  UIView *targetView = [UIApplication sharedApplication].delegate.window.rootViewController.view;
 
   targetView.frame = (CGRect){
     targetView.frame.origin,

React/Base/RCTProfile.m

@@ -289,7 +289,7 @@ void RCTProfileEndEvent(
   CHECK();
 
   NSMutableArray *events = RCTProfileGetThreadEvents();
-  NSArray *event = [events lastObject];
+  NSArray *event = events.lastObject;
   [events removeLastObject];
 
   if (!event) {

React/Base/RCTRootView.m

@@ -44,7 +44,7 @@ NSString *const RCTContentDidAppearNotification = @"RCTContentDidAppearNotificat
 
 @property (nonatomic, readonly) BOOL contentHasAppeared;
 
-- (instancetype)initWithFrame:(CGRect)frame bridge:(RCTBridge *)bridge;
+- (instancetype)initWithFrame:(CGRect)frame bridge:(RCTBridge *)bridge NS_DESIGNATED_INITIALIZER;
 
 @end
 
@@ -104,8 +104,8 @@ NSString *const RCTContentDidAppearNotification = @"RCTContentDidAppearNotificat
   return [self initWithBridge:bridge moduleName:moduleName initialProperties:initialProperties];
 }
 
-RCT_NOT_IMPLEMENTED(-initWithFrame:(CGRect)frame)
+RCT_NOT_IMPLEMENTED(- (instancetype)initWithFrame:(CGRect)frame)
-RCT_NOT_IMPLEMENTED(-initWithCoder:(NSCoder *)aDecoder)
+RCT_NOT_IMPLEMENTED(- (instancetype)initWithCoder:(NSCoder *)aDecoder)
 
 - (void)setBackgroundColor:(UIColor *)backgroundColor
 {
@@ -237,7 +237,7 @@ RCT_NOT_IMPLEMENTED(-initWithCoder:(NSCoder *)aDecoder)
 - (instancetype)initWithFrame:(CGRect)frame
                        bridge:(RCTBridge *)bridge
 {
-  if ((self = [super init])) {
+  if ((self = [super initWithFrame:frame])) {
     _bridge = bridge;
     [self setUp];
     self.frame = frame;
@@ -246,6 +246,8 @@ RCT_NOT_IMPLEMENTED(-initWithCoder:(NSCoder *)aDecoder)
   return self;
 }
 
+RCT_NOT_IMPLEMENTED(-(instancetype)initWithCoder:(nonnull NSCoder *)aDecoder)
+
 - (void)insertReactSubview:(id<RCTComponent>)subview atIndex:(NSInteger)atIndex
 {
   [super insertReactSubview:subview atIndex:atIndex];

React/Base/RCTSparseArray.m

@@ -117,7 +117,7 @@
 
 - (NSString *)description
 {
-  return [[super description] stringByAppendingString:[_storage description]];
+  return [super.description stringByAppendingString:_storage.description];
 }
 
 @end

React/Base/RCTTouchHandler.m

@@ -60,7 +60,7 @@
   return self;
 }
 
-RCT_NOT_IMPLEMENTED(-initWithTarget:(id)target action:(SEL)action)
+RCT_NOT_IMPLEMENTED(- (instancetype)initWithTarget:(id)target action:(SEL)action)
 
 typedef NS_ENUM(NSInteger, RCTTouchEventType) {
   RCTTouchEventTypeStart,
@@ -224,7 +224,7 @@ static BOOL RCTAnyTouchesChanged(NSSet *touches)
 {
   // If gesture just recognized, send all touches to JS as if they just began.
   if (self.state == UIGestureRecognizerStateBegan) {
-    [self _updateAndDispatchTouches:[_nativeTouches set] eventName:@"topTouchStart" originatingTime:0];
+    [self _updateAndDispatchTouches:_nativeTouches.set eventName:@"topTouchStart" originatingTime:0];
 
     // We store this flag separately from `state` because after a gesture is
     // recognized, its `state` changes immediately but its action (this

React/Base/RCTUtils.m

@@ -171,7 +171,7 @@ id RCTJSONClean(id object)
 
 NSString *RCTMD5Hash(NSString *string)
 {
-  const char *str = [string UTF8String];
+  const char *str = string.UTF8String;
   unsigned char result[CC_MD5_DIGEST_LENGTH];
   CC_MD5(str, (CC_LONG)strlen(str), result);
 

React/Executors/RCTContextExecutor.m

@@ -41,7 +41,7 @@
 
 @property (nonatomic, assign, readonly) JSGlobalContextRef ctx;
 
-- (instancetype)initWithJSContext:(JSGlobalContextRef)context;
+- (instancetype)initWithJSContext:(JSGlobalContextRef)context NS_DESIGNATED_INITIALIZER;
 
 @end
 
@@ -59,6 +59,8 @@
   return self;
 }
 
+RCT_NOT_IMPLEMENTED(-(instancetype)init)
+
 - (BOOL)isValid
 {
   return _ctx != NULL;
@@ -195,7 +197,7 @@ static NSError *RCTNSErrorFromJSError(JSContextRef context, JSValueRef jsError)
 {
   @autoreleasepool {
     // copy thread name to pthread name
-    pthread_setname_np([[[NSThread currentThread] name] UTF8String]);
+    pthread_setname_np([NSThread currentThread].name.UTF8String);
 
     // Set up a dummy runloop source to avoid spinning
     CFRunLoopSourceContext noSpinCtx = {0, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL};
@@ -204,7 +206,7 @@ static NSError *RCTNSErrorFromJSError(JSContextRef context, JSValueRef jsError)
     CFRelease(noSpinSource);
 
     // run the run loop
-    while (kCFRunLoopRunStopped != CFRunLoopRunInMode(kCFRunLoopDefaultMode, [[NSDate distantFuture] timeIntervalSinceReferenceDate], NO)) {
+    while (kCFRunLoopRunStopped != CFRunLoopRunInMode(kCFRunLoopDefaultMode, ((NSDate *)[NSDate distantFuture]).timeIntervalSinceReferenceDate, NO)) {
       RCTAssert(NO, @"not reached assertion"); // runloop spun. that's bad.
     }
   }
@@ -215,8 +217,8 @@ static NSError *RCTNSErrorFromJSError(JSContextRef context, JSValueRef jsError)
   NSThread *javaScriptThread = [[NSThread alloc] initWithTarget:[self class]
                                                        selector:@selector(runRunLoopThread)
                                                          object:nil];
-  [javaScriptThread setName:@"com.facebook.React.JavaScript"];
+  javaScriptThread.name = @"com.facebook.React.JavaScript";
-  [javaScriptThread setThreadPriority:[[NSThread mainThread] threadPriority]];
+  javaScriptThread.threadPriority = [NSThread mainThread].threadPriority;
   [javaScriptThread start];
 
   return [self initWithJavaScriptThread:javaScriptThread globalContextRef:NULL];

React/Executors/RCTWebViewExecutor.m

@@ -58,7 +58,7 @@ RCT_EXPORT_MODULE()
   return self;
 }
 
-- (id)init
+- (instancetype)init
 {
   return [self initWithWebView:nil];
 }

React/Modules/RCTAccessibilityManager.m

@@ -61,7 +61,7 @@ RCT_EXPORT_MODULE()
                                              selector:@selector(didReceiveNewContentSizeCategory:)
                                                  name:UIContentSizeCategoryDidChangeNotification
                                                object:[UIApplication sharedApplication]];
-    self.contentSizeCategory = [[UIApplication sharedApplication] preferredContentSizeCategory];
+    self.contentSizeCategory = [UIApplication sharedApplication].preferredContentSizeCategory;
   }
   return self;
 }

React/Modules/RCTAlertManager.m

@@ -90,7 +90,7 @@ RCT_EXPORT_METHOD(alertWithArgs:(NSDictionary *)args
     if (button.count != 1) {
       RCTLogError(@"Button definitions should have exactly one key.");
     }
-    NSString *buttonKey = [button.allKeys firstObject];
+    NSString *buttonKey = button.allKeys.firstObject;
     NSString *buttonTitle = [button[buttonKey] description];
     [alertView addButtonWithTitle:buttonTitle];
     if ([buttonKey isEqualToString: @"cancel"]) {

React/Modules/RCTAppState.m

@@ -25,7 +25,7 @@ static NSString *RCTCurrentAppBackgroundState()
     };
   });
 
-  return states[@([[UIApplication sharedApplication] applicationState])] ?: @"unknown";
+  return states[@([UIApplication sharedApplication].applicationState)] ?: @"unknown";
 }
 
 @implementation RCTAppState

React/Modules/RCTAsyncLocalStorage.m

@@ -66,7 +66,7 @@ static NSString *RCTGetStorageDirectory()
   static NSString *storageDirectory = nil;
   static dispatch_once_t onceToken;
   dispatch_once(&onceToken, ^{
-    storageDirectory = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) firstObject];
+    storageDirectory = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES).firstObject;
     storageDirectory = [storageDirectory stringByAppendingPathComponent:RCTStorageDirectory];
   });
   return storageDirectory;
@@ -390,7 +390,7 @@ RCT_EXPORT_METHOD(getAllKeys:(RCTResponseSenderBlock)callback)
   if (errorOut) {
     callback(@[errorOut, (id)kCFNull]);
   } else {
-    callback(@[(id)kCFNull, [_manifest allKeys]]);
+    callback(@[(id)kCFNull, _manifest.allKeys]);
   }
 }
 

React/Modules/RCTDevLoadingView.m

@@ -61,7 +61,7 @@ RCT_EXPORT_MODULE()
 
     _showDate = [NSDate date];
     if (!_window && !RCTRunningInTestEnvironment()) {
-      CGFloat screenWidth = [[UIScreen mainScreen] bounds].size.width;
+      CGFloat screenWidth = [UIScreen mainScreen].bounds.size.width;
       _window = [[UIWindow alloc] initWithFrame:CGRectMake(0, 0, screenWidth, 22)];
       _window.backgroundColor = [UIColor blackColor];
       _window.windowLevel = UIWindowLevelStatusBar + 1;
@@ -76,10 +76,10 @@ RCT_EXPORT_MODULE()
     }
 
     NSString *source;
-    if ([URL isFileURL]) {
+    if (URL.fileURL) {
       source = @"pre-bundled file";
     } else {
-      source = [NSString stringWithFormat:@"%@:%@", [URL host], [URL port]];
+      source = [NSString stringWithFormat:@"%@:%@", URL.host, URL.port];
     }
 
     _label.text = [NSString stringWithFormat:@"Loading from %@...", source];

React/Modules/RCTDevMenu.m

@@ -64,7 +64,7 @@ static NSString *const RCTDevMenuSettingsKey = @"RCTDevMenu";
   return self;
 }
 
-RCT_NOT_IMPLEMENTED(-init)
+RCT_NOT_IMPLEMENTED(- (instancetype)init)
 
 @end
 
@@ -210,7 +210,7 @@ RCT_EXPORT_MODULE()
     } else {
       RCTLogWarn(@"RCTSourceCode module scriptURL has not been set");
     }
-  } else if (![sourceCodeModule.scriptURL isFileURL]) {
+  } else if (!(sourceCodeModule.scriptURL).fileURL) {
     // Live reloading is disabled when running from bundled JS file
     _liveReloadURL = [[NSURL alloc] initWithString:@"/onchange" relativeToURL:sourceCodeModule.scriptURL];
   }
@@ -341,7 +341,7 @@ RCT_EXPORT_METHOD(show)
   }
 
   [actionSheet addButtonWithTitle:@"Cancel"];
-  actionSheet.cancelButtonIndex = [actionSheet numberOfButtons] - 1;
+  actionSheet.cancelButtonIndex = actionSheet.numberOfButtons - 1;
 
   actionSheet.actionSheetStyle = UIBarStyleBlack;
   [actionSheet showInView:[UIApplication sharedApplication].keyWindow.rootViewController.view];

React/Modules/RCTRedBox.m

@@ -32,7 +32,7 @@
   UITableViewCell *_cachedMessageCell;
 }
 
-- (id)initWithFrame:(CGRect)frame
+- (instancetype)initWithFrame:(CGRect)frame
 {
   if ((self = [super initWithFrame:frame])) {
     self.windowLevel = UIWindowLevelAlert + 1000;
@@ -89,7 +89,7 @@
   return self;
 }
 
-RCT_NOT_IMPLEMENTED(-initWithCoder:(NSCoder *)aDecoder)
+RCT_NOT_IMPLEMENTED(- (instancetype)initWithCoder:(NSCoder *)aDecoder)
 
 - (void)dealloc
 {
@@ -99,7 +99,7 @@ RCT_NOT_IMPLEMENTED(-initWithCoder:(NSCoder *)aDecoder)
 - (void)openStackFrameInEditor:(NSDictionary *)stackFrame
 {
   NSData *stackFrameJSON = [RCTJSONStringify(stackFrame, nil) dataUsingEncoding:NSUTF8StringEncoding];
-  NSString *postLength = [NSString stringWithFormat:@"%lu", (unsigned long)[stackFrameJSON length]];
+  NSString *postLength = [NSString stringWithFormat:@"%lu", (unsigned long)stackFrameJSON.length];
   NSMutableURLRequest *request = [NSMutableURLRequest new];
   request.URL = [RCTConvert NSURL:@"http://localhost:8081/open-stack-frame"];
   request.HTTPMethod = @"POST";
@@ -135,7 +135,7 @@ RCT_NOT_IMPLEMENTED(-initWithCoder:(NSCoder *)aDecoder)
 {
   self.hidden = YES;
   [self resignFirstResponder];
-  [[[[UIApplication sharedApplication] delegate] window] makeKeyWindow];
+  [[UIApplication sharedApplication].delegate.window makeKeyWindow];
 }
 
 - (void)reload
@@ -152,17 +152,17 @@ RCT_NOT_IMPLEMENTED(-initWithCoder:(NSCoder *)aDecoder)
 
 - (NSInteger)tableView:(__unused UITableView *)tableView numberOfRowsInSection:(NSInteger)section
 {
-  return section == 0 ? 1 : [_lastStackTrace count];
+  return section == 0 ? 1 : _lastStackTrace.count;
 }
 
 - (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
 {
-  if ([indexPath section] == 0) {
+  if (indexPath.section == 0) {
     UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:@"msg-cell"];
     return [self reuseCell:cell forErrorMessage:_lastErrorMessage];
   }
   UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:@"cell"];
-  NSUInteger index = [indexPath row];
+  NSUInteger index = indexPath.row;
   NSDictionary *stackFrame = _lastStackTrace[index];
   return [self reuseCell:cell forStackFrame:stackFrame];
 }
@@ -213,7 +213,7 @@ RCT_NOT_IMPLEMENTED(-initWithCoder:(NSCoder *)aDecoder)
 
 - (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath
 {
-  if ([indexPath section] == 0) {
+  if (indexPath.section == 0) {
     NSMutableParagraphStyle *paragraphStyle = [[NSParagraphStyle defaultParagraphStyle] mutableCopy];
     paragraphStyle.lineBreakMode = NSLineBreakByWordWrapping;
 
@@ -228,8 +228,8 @@ RCT_NOT_IMPLEMENTED(-initWithCoder:(NSCoder *)aDecoder)
 
 - (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
 {
-  if ([indexPath section] == 1) {
+  if (indexPath.section == 1) {
-    NSUInteger row = [indexPath row];
+    NSUInteger row = indexPath.row;
     NSDictionary *stackFrame = _lastStackTrace[row];
     [self openStackFrameInEditor:stackFrame];
   }

React/Modules/RCTSourceCode.m

@@ -23,7 +23,7 @@ RCT_EXPORT_METHOD(getScriptText:(RCTResponseSenderBlock)successCallback
                   failureCallback:(RCTResponseErrorBlock)failureCallback)
 {
   if (self.scriptText && self.scriptURL) {
-    successCallback(@[@{@"text": self.scriptText, @"url":[self.scriptURL absoluteString]}]);
+    successCallback(@[@{@"text": self.scriptText, @"url": self.scriptURL.absoluteString}]);
   } else {
     failureCallback(RCTErrorWithMessage(@"Source code is not available"));
   }
@@ -31,7 +31,7 @@ RCT_EXPORT_METHOD(getScriptText:(RCTResponseSenderBlock)successCallback
 
 - (NSDictionary *)constantsToExport
 {
-  NSString *URL = [self.bridge.bundleURL absoluteString] ?: @"";
+  NSString *URL = self.bridge.bundleURL.absoluteString ?: @"";
   return @{@"scriptURL": URL};
 }
 

React/Modules/RCTStatusBarManager.m

@@ -116,7 +116,7 @@ RCT_EXPORT_METHOD(setHidden:(BOOL)hidden
 
 RCT_EXPORT_METHOD(setNetworkActivityIndicatorVisible:(BOOL)visible)
 {
-  [[UIApplication sharedApplication] setNetworkActivityIndicatorVisible:visible];
+  [UIApplication sharedApplication].networkActivityIndicatorVisible = visible;
 }
 
 @end

React/Modules/RCTTiming.m

@@ -145,7 +145,7 @@ RCT_EXPORT_MODULE()
   }
 
   // call timers that need to be called
-  if ([timersToCall count] > 0) {
+  if (timersToCall.count > 0) {
     [_bridge enqueueJSCall:@"JSTimersExecution.callTimers" args:@[timersToCall]];
   }
 

React/Modules/RCTUIManager.m

@@ -731,7 +731,7 @@ RCT_EXPORT_METHOD(manageChildren:(nonnull NSNumber *)containerReactTag
     }
   }
 
-  NSArray *sortedIndices = [[destinationsToChildrenToAdd allKeys] sortedArrayUsingSelector:@selector(compare:)];
+  NSArray *sortedIndices = [destinationsToChildrenToAdd.allKeys sortedArrayUsingSelector:@selector(compare:)];
   for (NSNumber *reactIndex in sortedIndices) {
     [container insertReactSubview:destinationsToChildrenToAdd[reactIndex] atIndex:reactIndex.integerValue];
   }
@@ -760,7 +760,7 @@ RCT_EXPORT_METHOD(createView:(nonnull NSNumber *)reactTag
   [self addUIBlock:^(RCTUIManager *uiManager, RCTSparseArray *viewRegistry){
     id<RCTComponent> view = [componentData createViewWithTag:reactTag];
     if ([view respondsToSelector:@selector(setBackgroundColor:)]) {
-      [(UIView *)view setBackgroundColor:backgroundColor];
+      ((UIView *)view).backgroundColor = backgroundColor;
     }
     [componentData setProps:props forView:view];
     if ([view respondsToSelector:@selector(reactBridgeDidFinishTransaction)]) {
@@ -810,7 +810,7 @@ RCT_EXPORT_METHOD(findSubviewIn:(nonnull NSNumber *)reactTag atPoint:(CGPoint)po
     CGRect frame = [target convertRect:target.bounds toView:view];
 
     while (target.reactTag == nil && target.superview != nil) {
-      target = [target superview];
+      target = target.superview;
     }
 
     callback(@[
@@ -858,7 +858,7 @@ RCT_EXPORT_METHOD(findSubviewIn:(nonnull NSNumber *)reactTag atPoint:(CGPoint)po
   }
 
   RCTProfileEndEvent(0, @"uimanager", @{
-    @"view_count": @([_viewRegistry count]),
+    @"view_count": @(_viewRegistry.count),
   });
   [self flushUIBlocks];
 }
@@ -1005,7 +1005,7 @@ RCT_EXPORT_METHOD(measureViewsInRect:(CGRect)rect
     return;
   }
   NSArray *childShadowViews = [shadowView reactSubviews];
-  NSMutableArray *results = [[NSMutableArray alloc] initWithCapacity:[childShadowViews count]];
+  NSMutableArray *results = [[NSMutableArray alloc] initWithCapacity:childShadowViews.count];
 
   [childShadowViews enumerateObjectsUsingBlock:
    ^(RCTShadowView *childShadowView, NSUInteger idx, __unused BOOL *stop) {

React/Views/RCTComponentData.m

@@ -60,7 +60,7 @@ typedef void (^RCTPropBlock)(id<RCTComponent> view, id json);
   return self;
 }
 
-RCT_NOT_IMPLEMENTED(-init)
+RCT_NOT_IMPLEMENTED(- (instancetype)init)
 
 - (id<RCTComponent>)createViewWithTag:(NSNumber *)tag
 {
@@ -126,7 +126,7 @@ RCT_NOT_IMPLEMENTED(-init)
       NSString *key = name;
       NSArray *parts = [keyPath componentsSeparatedByString:@"."];
       if (parts) {
-        key = [parts lastObject];
+        key = parts.lastObject;
         parts = [parts subarrayWithRange:(NSRange){0, parts.count - 1}];
       }
 
@@ -135,7 +135,7 @@ RCT_NOT_IMPLEMENTED(-init)
 
       // Get property setter
       SEL setter = NSSelectorFromString([NSString stringWithFormat:@"set%@%@:",
-                                         [[key substringToIndex:1] uppercaseString],
+                                         [key substringToIndex:1].uppercaseString,
                                          [key substringFromIndex:1]]);
 
       // Build setter block
@@ -176,8 +176,8 @@ RCT_NOT_IMPLEMENTED(-init)
         default: {
 
           NSInvocation *typeInvocation = [NSInvocation invocationWithMethodSignature:typeSignature];
-          [typeInvocation setSelector:type];
+          typeInvocation.selector = type;
-          [typeInvocation setTarget:[RCTConvert class]];
+          typeInvocation.target = [RCTConvert class];
 
           __block NSInvocation *sourceInvocation = nil;
           __block NSInvocation *targetInvocation = nil;
@@ -194,7 +194,7 @@ RCT_NOT_IMPLEMENTED(-init)
               if (!sourceInvocation && source) {
                 NSMethodSignature *signature = [source methodSignatureForSelector:getter];
                 sourceInvocation = [NSInvocation invocationWithMethodSignature:signature];
-                [sourceInvocation setSelector:getter];
+                sourceInvocation.selector = getter;
               }
               [sourceInvocation invokeWithTarget:source];
               [sourceInvocation getReturnValue:value];
@@ -204,7 +204,7 @@ RCT_NOT_IMPLEMENTED(-init)
             if (!targetInvocation && target) {
               NSMethodSignature *signature = [target methodSignatureForSelector:setter];
               targetInvocation = [NSInvocation invocationWithMethodSignature:signature];
-              [targetInvocation setSelector:setter];
+              targetInvocation.selector = setter;
             }
             [targetInvocation setArgument:value atIndex:2];
             [targetInvocation invokeWithTarget:target];

React/Views/RCTDatePickerManager.m

@@ -51,7 +51,7 @@ RCT_REMAP_VIEW_PROPERTY(timeZoneOffsetInMinutes, timeZone, NSTimeZone)
 {
   NSDictionary *event = @{
     @"target": sender.reactTag,
-    @"timestamp": @([sender.date timeIntervalSince1970] * 1000.0)
+    @"timestamp": @(sender.date.timeIntervalSince1970 * 1000.0)
   };
   [self.bridge.eventDispatcher sendInputEventWithName:@"change" body:event];
 }

React/Views/RCTModalHostView.m

@@ -24,8 +24,8 @@
   RCTTouchHandler *_touchHandler;
 }
 
-RCT_NOT_IMPLEMENTED(-initWithFrame:(CGRect)frame)
+RCT_NOT_IMPLEMENTED(- (instancetype)initWithFrame:(CGRect)frame)
-RCT_NOT_IMPLEMENTED(-initWithCoder:coder)
+RCT_NOT_IMPLEMENTED(- (instancetype)initWithCoder:coder)
 
 - (instancetype)initWithBridge:(RCTBridge *)bridge
 {

React/Views/RCTNavigator.m

@@ -293,8 +293,8 @@ NSInteger kNeverProgressed = -10000;
   return self;
 }
 
-RCT_NOT_IMPLEMENTED(-initWithFrame:(CGRect)frame)
+RCT_NOT_IMPLEMENTED(- (instancetype)initWithFrame:(CGRect)frame)
-RCT_NOT_IMPLEMENTED(-initWithCoder:(NSCoder *)aDecoder)
+RCT_NOT_IMPLEMENTED(- (instancetype)initWithCoder:(NSCoder *)aDecoder)
 
 - (void)didUpdateFrame:(__unused RCTFrameUpdate *)update
 {
@@ -501,13 +501,13 @@ BOOL jsGettingtooSlow =
   }
   if (jsGettingAhead) {
     if (reactPushOne) {
-      UIView *lastView = [_currentViews lastObject];
+      UIView *lastView = _currentViews.lastObject;
       RCTWrapperViewController *vc = [[RCTWrapperViewController alloc] initWithNavItem:(RCTNavItem *)lastView eventDispatcher:_bridge.eventDispatcher];
       vc.navigationListener = self;
       _numberOfViewControllerMovesToIgnore = 1;
       [_navigationController pushViewController:vc animated:(currentReactCount > 1)];
     } else if (reactPopN) {
-      UIViewController *viewControllerToPopTo = [[_navigationController viewControllers] objectAtIndex:(currentReactCount - 1)];
+      UIViewController *viewControllerToPopTo = _navigationController.viewControllers[(currentReactCount - 1)];
       _numberOfViewControllerMovesToIgnore = viewControllerCount - currentReactCount;
       [_navigationController popToViewController:viewControllerToPopTo animated:YES];
     } else {

React/Views/RCTPicker.m

@@ -39,8 +39,8 @@ const NSInteger UNINITIALIZED_INDEX = -1;
   return self;
 }
 
-RCT_NOT_IMPLEMENTED(-initWithFrame:(CGRect)frame)
+RCT_NOT_IMPLEMENTED(- (instancetype)initWithFrame:(CGRect)frame)
-RCT_NOT_IMPLEMENTED(-initWithCoder:(NSCoder *)aDecoder)
+RCT_NOT_IMPLEMENTED(- (instancetype)initWithCoder:(NSCoder *)aDecoder)
 
 - (void)setItems:(NSArray *)items
 {

React/Views/RCTScrollView.m

@@ -56,7 +56,7 @@ CGFloat const ZINDEX_STICKY_HEADER = 50;
   return self;
 }
 
-RCT_NOT_IMPLEMENTED(-init)
+RCT_NOT_IMPLEMENTED(- (instancetype)init)
 
 - (uint16_t)coalescingKey
 {
@@ -266,7 +266,7 @@ RCT_NOT_IMPLEMENTED(-init)
       contentOffset.y = -(scrollViewSize.height - subviewSize.height) / 2.0;
     }
   }
-  [super setContentOffset:contentOffset];
+  super.contentOffset = contentOffset;
 }
 
 - (void)dockClosestSectionHeader
@@ -354,10 +354,6 @@ RCT_NOT_IMPLEMENTED(-init)
 
 @end
 
-@interface RCTScrollView (Private)
-- (NSArray *)calculateChildFramesData;
-@end
-
 @implementation RCTScrollView
 {
   RCTEventDispatcher *_eventDispatcher;
@@ -394,8 +390,8 @@ RCT_NOT_IMPLEMENTED(-init)
   return self;
 }
 
-RCT_NOT_IMPLEMENTED(-initWithFrame:(CGRect)frame)
+RCT_NOT_IMPLEMENTED(- (instancetype)initWithFrame:(CGRect)frame)
-RCT_NOT_IMPLEMENTED(-initWithCoder:(NSCoder *)aDecoder)
+RCT_NOT_IMPLEMENTED(- (instancetype)initWithCoder:(NSCoder *)aDecoder)
 
 - (void)setRemoveClippedSubviews:(__unused BOOL)removeClippedSubviews
 {
@@ -445,8 +441,8 @@ RCT_NOT_IMPLEMENTED(-initWithCoder:(NSCoder *)aDecoder)
 
 - (void)setClipsToBounds:(BOOL)clipsToBounds
 {
-  [super setClipsToBounds:clipsToBounds];
+  super.clipsToBounds = clipsToBounds;
-  [_scrollView setClipsToBounds:clipsToBounds];
+  _scrollView.clipsToBounds = clipsToBounds;
 }
 
 - (void)dealloc

React/Views/RCTScrollViewManager.m

@@ -15,7 +15,9 @@
 #import "RCTUIManager.h"
 
 @interface RCTScrollView (Private)
+
 - (NSArray *)calculateChildFramesData;
+
 @end
 
 @implementation RCTConvert (UIScrollView)

React/Views/RCTSegmentedControl.m

@@ -18,7 +18,7 @@
   RCTEventDispatcher *_eventDispatcher;
 }
 
-- (id)initWithEventDispatcher:(RCTEventDispatcher *)eventDispatcher
+- (instancetype)initWithEventDispatcher:(RCTEventDispatcher *)eventDispatcher
 {
   if ((self = [super initWithFrame:CGRectZero])) {
     _eventDispatcher = eventDispatcher;

React/Views/RCTShadowView.m

@@ -20,7 +20,7 @@ typedef void (^RCTResetActionBlock)(RCTShadowView *shadowViewSelf);
 
 const NSString *const RCTBackgroundColorProp = @"backgroundColor";
 
-typedef enum {
+typedef NS_ENUM(unsigned int, meta_prop_t) {
   META_PROP_LEFT,
   META_PROP_TOP,
   META_PROP_RIGHT,
@@ -29,7 +29,7 @@ typedef enum {
   META_PROP_VERTICAL,
   META_PROP_ALL,
   META_PROP_COUNT,
-} meta_prop_t;
+};
 
 @implementation RCTShadowView
 {
@@ -246,7 +246,7 @@ static void RCTProcessMetaProps(const float metaProps[META_PROP_COUNT], float st
 
     _frame = CGRectMake(0, 0, CSS_UNDEFINED, CSS_UNDEFINED);
 
-    for (int ii = 0; ii < META_PROP_COUNT; ii++) {
+    for (unsigned int ii = 0; ii < META_PROP_COUNT; ii++) {
       _paddingMetaProps[ii] = CSS_UNDEFINED;
       _marginMetaProps[ii] = CSS_UNDEFINED;
       _borderMetaProps[ii] = CSS_UNDEFINED;
@@ -326,7 +326,7 @@ static void RCTProcessMetaProps(const float metaProps[META_PROP_COUNT], float st
 - (void)insertReactSubview:(RCTShadowView *)subview atIndex:(NSInteger)atIndex
 {
   [_reactSubviews insertObject:subview atIndex:atIndex];
-  _cssNode->children_count = (int)[_reactSubviews count];
+  _cssNode->children_count = (int)_reactSubviews.count;
   subview->_superview = self;
   [self dirtyText];
   [self dirtyLayout];
@@ -340,7 +340,7 @@ static void RCTProcessMetaProps(const float metaProps[META_PROP_COUNT], float st
   [subview dirtyPropagation];
   subview->_superview = nil;
   [_reactSubviews removeObject:subview];
-  _cssNode->children_count = (int)[_reactSubviews count];
+  _cssNode->children_count = (int)_reactSubviews.count;
 }
 
 - (NSArray *)reactSubviews

React/Views/RCTTabBar.m

@@ -44,8 +44,8 @@
   return self;
 }
 
-RCT_NOT_IMPLEMENTED(-initWithFrame:(CGRect)frame)
+RCT_NOT_IMPLEMENTED(- (instancetype)initWithFrame:(CGRect)frame)
-RCT_NOT_IMPLEMENTED(-initWithCoder:(NSCoder *)aDecoder)
+RCT_NOT_IMPLEMENTED(- (instancetype)initWithCoder:(NSCoder *)aDecoder)
 
 - (UIViewController *)reactViewController
 {

React/Views/RCTTabBarItem.m

@@ -72,7 +72,7 @@
       RCTLogError(@"The tab bar icon '%@' did not match any known image or system icon", icon);
       return;
     }
-    _barItem = [[UITabBarItem alloc] initWithTabBarSystemItem:[systemIcon integerValue] tag:oldItem.tag];
+    _barItem = [[UITabBarItem alloc] initWithTabBarSystemItem:systemIcon.integerValue tag:oldItem.tag];
   }
 
   // Reapply previous properties

React/Views/RCTTabBarItemManager.m

@@ -28,7 +28,7 @@ RCT_REMAP_VIEW_PROPERTY(badge, barItem.badgeValue, NSString);
 RCT_CUSTOM_VIEW_PROPERTY(title, NSString, RCTTabBarItem)
 {
   view.barItem.title = json ? [RCTConvert NSString:json] : defaultView.barItem.title;
-  view.barItem.imageInsets = [view.barItem.title length] ? UIEdgeInsetsZero : (UIEdgeInsets){6, 0, -6, 0};
+  view.barItem.imageInsets = view.barItem.title.length ? UIEdgeInsetsZero : (UIEdgeInsets){6, 0, -6, 0};
 }
 
 @end

React/Views/RCTView.m

@@ -49,7 +49,7 @@ static UIView *RCTViewHitTest(UIView *view, CGPoint point, UIEvent *event)
   // we do support clipsToBounds, so if that's enabled
   // we'll update the clipping
 
-  if (self.clipsToBounds && [self.subviews count] > 0) {
+  if (self.clipsToBounds && self.subviews.count > 0) {
     clipRect = [clipView convertRect:clipRect toView:self];
     clipRect = CGRectIntersection(clipRect, self.bounds);
     clipView = self;
@@ -93,7 +93,7 @@ static NSString *RCTRecursiveAccessibilityLabel(UIView *view)
 {
   NSMutableString *str = [NSMutableString stringWithString:@""];
   for (UIView *subview in view.subviews) {
-    NSString *label = [subview accessibilityLabel];
+    NSString *label = subview.accessibilityLabel;
     if (label) {
       [str appendString:@" "];
       [str appendString:label];
@@ -123,13 +123,13 @@ static NSString *RCTRecursiveAccessibilityLabel(UIView *view)
     _borderBottomLeftRadius = -1;
     _borderBottomRightRadius = -1;
 
-    _backgroundColor = [super backgroundColor];
+    _backgroundColor = super.backgroundColor;
   }
 
   return self;
 }
 
-RCT_NOT_IMPLEMENTED(-initWithCoder:unused)
+RCT_NOT_IMPLEMENTED(- (instancetype)initWithCoder:unused)
 
 - (NSString *)accessibilityLabel
 {
@@ -210,8 +210,8 @@ RCT_NOT_IMPLEMENTED(-initWithCoder:unused)
     baseInset.left += autoInset.left;
     baseInset.right += autoInset.right;
   }
-  [scrollView setContentInset:baseInset];
+  scrollView.contentInset = baseInset;
-  [scrollView setScrollIndicatorInsets:baseInset];
+  scrollView.scrollIndicatorInsets = baseInset;
 
   if (updateOffset) {
     // If we're adjusting the top inset, then let's also adjust the contentOffset so that the view
@@ -333,7 +333,7 @@ RCT_NOT_IMPLEMENTED(-initWithCoder:unused)
     return [super react_updateClippedSubviewsWithClipRect:clipRect relativeToView:clipView];
   }
 
-  if ([_reactSubviews count] == 0) {
+  if (_reactSubviews.count == 0) {
     // Do nothing if we have no subviews
     return;
   }
@@ -405,7 +405,7 @@ RCT_NOT_IMPLEMENTED(-initWithCoder:unused)
   // offscreen views. If _reactSubviews is nil, we can assume
   // that [self reactSubviews] and [self subviews] are the same
 
-  return _reactSubviews ?: [self subviews];
+  return _reactSubviews ?: self.subviews;
 }
 
 - (void)updateClippedSubviews

React/Views/RCTViewManager.m

@@ -51,7 +51,7 @@ RCT_EXPORT_MODULE()
 
 - (dispatch_queue_t)methodQueue
 {
-  return [_bridge.uiManager methodQueue];
+  return _bridge.uiManager.methodQueue;
 }
 
 - (UIView *)view

React/Views/RCTWebView.m

@@ -47,8 +47,8 @@ NSString *const RCTJSNavigationScheme = @"react-js-navigation";
   return self;
 }
 
-RCT_NOT_IMPLEMENTED(-initWithFrame:(CGRect)frame)
+RCT_NOT_IMPLEMENTED(- (instancetype)initWithFrame:(CGRect)frame)
-RCT_NOT_IMPLEMENTED(-initWithCoder:(NSCoder *)aDecoder)
+RCT_NOT_IMPLEMENTED(- (instancetype)initWithCoder:(NSCoder *)aDecoder)
 
 - (void)goForward
 {
@@ -127,11 +127,11 @@ RCT_NOT_IMPLEMENTED(-initWithCoder:(NSCoder *)aDecoder)
   NSString *title = [_webView stringByEvaluatingJavaScriptFromString:@"document.title"];
   NSMutableDictionary *event = [[NSMutableDictionary alloc] initWithDictionary: @{
     @"target": self.reactTag,
-    @"url": url ? [url absoluteString] : @"",
+    @"url": url ? url.absoluteString : @"",
     @"loading" : @(_webView.loading),
     @"title": title,
-    @"canGoBack": @([_webView canGoBack]),
+    @"canGoBack": @(_webView.canGoBack),
-    @"canGoForward" : @([_webView canGoForward]),
+    @"canGoForward" : @(_webView.canGoForward),
   }];
 
   return event;
@@ -148,7 +148,7 @@ RCT_NOT_IMPLEMENTED(-initWithCoder:(NSCoder *)aDecoder)
   if (isTopFrame) {
     NSMutableDictionary *event = [self baseEvent];
     [event addEntriesFromDictionary: @{
-      @"url": [request.URL absoluteString],
+      @"url": (request.URL).absoluteString,
       @"navigationType": @(navigationType)
     }];
     [_eventDispatcher sendInputEventWithName:@"loadingStart" body:event];
@@ -172,7 +172,7 @@ RCT_NOT_IMPLEMENTED(-initWithCoder:(NSCoder *)aDecoder)
   [event addEntriesFromDictionary: @{
     @"domain": error.domain,
     @"code": @(error.code),
-    @"description": [error localizedDescription],
+    @"description": error.localizedDescription,
   }];
   [_eventDispatcher sendInputEventWithName:@"loadingError" body:event];
 }

React/Views/RCTWrapperViewController.m

@@ -52,8 +52,8 @@
   return self;
 }
 
-RCT_NOT_IMPLEMENTED(-initWithNibName:(NSString *)nn bundle:(NSBundle *)nb)
+RCT_NOT_IMPLEMENTED(- (instancetype)initWithNibName:(NSString *)nn bundle:(NSBundle *)nb)
-RCT_NOT_IMPLEMENTED(-initWithCoder:(NSCoder *)aDecoder)
+RCT_NOT_IMPLEMENTED(- (instancetype)initWithCoder:(NSCoder *)aDecoder)
 
 - (void)viewWillLayoutSubviews
 {