/** * Copyright (c) 2015-present, Facebook, Inc. * * This source code is licensed under the MIT license found in the * LICENSE file in the root directory of this source tree. */ #import #import #import #import #import #import #import #import #import #import "RCTImageCache.h" #import "RCTImageUtils.h" @implementation UIImage (React) - (CAKeyframeAnimation *)reactKeyframeAnimation { return objc_getAssociatedObject(self, _cmd); } - (void)setReactKeyframeAnimation:(CAKeyframeAnimation *)reactKeyframeAnimation { objc_setAssociatedObject(self, @selector(reactKeyframeAnimation), reactKeyframeAnimation, OBJC_ASSOCIATION_COPY_NONATOMIC); } @end @implementation RCTImageLoader { NSArray> *_loaders; NSArray> *_decoders; NSOperationQueue *_imageDecodeQueue; dispatch_queue_t _URLRequestQueue; id _imageCache; NSMutableArray *_pendingTasks; NSInteger _activeTasks; NSMutableArray *_pendingDecodes; NSInteger _scheduledDecodes; NSUInteger _activeBytes; __weak id _redirectDelegate; } @synthesize bridge = _bridge; RCT_EXPORT_MODULE() - (instancetype)init { return [self initWithRedirectDelegate:nil]; } + (BOOL)requiresMainQueueSetup { return NO; } - (instancetype)initWithRedirectDelegate:(id)redirectDelegate { if (self = [super init]) { _redirectDelegate = redirectDelegate; } return self; } - (void)setUp { // Set defaults _maxConcurrentLoadingTasks = _maxConcurrentLoadingTasks ?: 4; _maxConcurrentDecodingTasks = _maxConcurrentDecodingTasks ?: 2; _maxConcurrentDecodingBytes = _maxConcurrentDecodingBytes ?: 30 * 1024 * 1024; // 30MB _URLRequestQueue = dispatch_queue_create("com.facebook.react.ImageLoaderURLRequestQueue", DISPATCH_QUEUE_SERIAL); } - (float)handlerPriority { return 2; } - (id)imageCache { if (!_imageCache) { //set up with default cache _imageCache = [RCTImageCache new]; } return _imageCache; } - (void)setImageCache:(id)cache { if (_imageCache) { RCTLogWarn(@"RCTImageCache was already set and has now been overriden."); } _imageCache = cache; } - (id)imageURLLoaderForURL:(NSURL *)URL { if (!_maxConcurrentLoadingTasks) { [self setUp]; } if (!_loaders) { // Get loaders, sorted in reverse priority order (highest priority first) RCTAssert(_bridge, @"Bridge not set"); _loaders = [[_bridge modulesConformingToProtocol:@protocol(RCTImageURLLoader)] sortedArrayUsingComparator:^NSComparisonResult(id a, id b) { float priorityA = [a respondsToSelector:@selector(loaderPriority)] ? [a loaderPriority] : 0; float priorityB = [b respondsToSelector:@selector(loaderPriority)] ? [b loaderPriority] : 0; if (priorityA > priorityB) { return NSOrderedAscending; } else if (priorityA < priorityB) { return NSOrderedDescending; } else { return NSOrderedSame; } }]; } if (RCT_DEBUG) { // Check for handler conflicts float previousPriority = 0; id previousLoader = nil; for (id loader in _loaders) { float priority = [loader respondsToSelector:@selector(loaderPriority)] ? [loader loaderPriority] : 0; if (previousLoader && priority < previousPriority) { return previousLoader; } if ([loader canLoadImageURL:URL]) { if (previousLoader) { if (priority == previousPriority) { RCTLogError(@"The RCTImageURLLoaders %@ and %@ both reported that" " they can load the URL %@, and have equal priority" " (%g). This could result in non-deterministic behavior.", loader, previousLoader, URL, priority); } } else { previousLoader = loader; previousPriority = priority; } } } return previousLoader; } // Normal code path for (id loader in _loaders) { if ([loader canLoadImageURL:URL]) { return loader; } } return nil; } - (id)imageDataDecoderForData:(NSData *)data { if (!_maxConcurrentLoadingTasks) { [self setUp]; } if (!_decoders) { // Get decoders, sorted in reverse priority order (highest priority first) RCTAssert(_bridge, @"Bridge not set"); _decoders = [[_bridge modulesConformingToProtocol:@protocol(RCTImageDataDecoder)] sortedArrayUsingComparator:^NSComparisonResult(id a, id b) { float priorityA = [a respondsToSelector:@selector(decoderPriority)] ? [a decoderPriority] : 0; float priorityB = [b respondsToSelector:@selector(decoderPriority)] ? [b decoderPriority] : 0; if (priorityA > priorityB) { return NSOrderedAscending; } else if (priorityA < priorityB) { return NSOrderedDescending; } else { return NSOrderedSame; } }]; } if (RCT_DEBUG) { // Check for handler conflicts float previousPriority = 0; id previousDecoder = nil; for (id decoder in _decoders) { float priority = [decoder respondsToSelector:@selector(decoderPriority)] ? [decoder decoderPriority] : 0; if (previousDecoder && priority < previousPriority) { return previousDecoder; } if ([decoder canDecodeImageData:data]) { if (previousDecoder) { if (priority == previousPriority) { RCTLogError(@"The RCTImageDataDecoders %@ and %@ both reported that" " they can decode the data , and" " have equal priority (%g). This could result in" " non-deterministic behavior.", decoder, previousDecoder, data, data.length, priority); } } else { previousDecoder = decoder; previousPriority = priority; } } } return previousDecoder; } // Normal code path for (id decoder in _decoders) { if ([decoder canDecodeImageData:data]) { return decoder; } } return nil; } static UIImage *RCTResizeImageIfNeeded(UIImage *image, CGSize size, CGFloat scale, RCTResizeMode resizeMode) { if (CGSizeEqualToSize(size, CGSizeZero) || CGSizeEqualToSize(image.size, CGSizeZero) || CGSizeEqualToSize(image.size, size)) { return image; } CAKeyframeAnimation *animation = image.reactKeyframeAnimation; CGRect targetSize = RCTTargetRect(image.size, size, scale, resizeMode); CGAffineTransform transform = RCTTransformFromTargetRect(image.size, targetSize); image = RCTTransformImage(image, size, scale, transform); image.reactKeyframeAnimation = animation; return image; } - (RCTImageLoaderCancellationBlock)loadImageWithURLRequest:(NSURLRequest *)imageURLRequest callback:(RCTImageLoaderCompletionBlock)callback { return [self loadImageWithURLRequest:imageURLRequest size:CGSizeZero scale:1 clipped:YES resizeMode:RCTResizeModeStretch progressBlock:nil partialLoadBlock:nil completionBlock:callback]; } - (void)dequeueTasks { dispatch_async(_URLRequestQueue, ^{ // Remove completed tasks NSMutableArray *tasksToRemove = nil; for (RCTNetworkTask *task in self->_pendingTasks.reverseObjectEnumerator) { switch (task.status) { case RCTNetworkTaskFinished: if (!tasksToRemove) { tasksToRemove = [NSMutableArray new]; } [tasksToRemove addObject:task]; self->_activeTasks--; break; case RCTNetworkTaskPending: break; case RCTNetworkTaskInProgress: // Check task isn't "stuck" if (task.requestToken == nil) { RCTLogWarn(@"Task orphaned for request %@", task.request); if (!tasksToRemove) { tasksToRemove = [NSMutableArray new]; } [tasksToRemove addObject:task]; self->_activeTasks--; [task cancel]; } break; } } if (tasksToRemove) { [self->_pendingTasks removeObjectsInArray:tasksToRemove]; } // Start queued decode NSInteger activeDecodes = self->_scheduledDecodes - self->_pendingDecodes.count; while (activeDecodes == 0 || (self->_activeBytes <= self->_maxConcurrentDecodingBytes && activeDecodes <= self->_maxConcurrentDecodingTasks)) { dispatch_block_t decodeBlock = self->_pendingDecodes.firstObject; if (decodeBlock) { [self->_pendingDecodes removeObjectAtIndex:0]; decodeBlock(); } else { break; } } // Start queued tasks for (RCTNetworkTask *task in self->_pendingTasks) { if (MAX(self->_activeTasks, self->_scheduledDecodes) >= self->_maxConcurrentLoadingTasks) { break; } if (task.status == RCTNetworkTaskPending) { [task start]; self->_activeTasks++; } } }); } /** * This returns either an image, or raw image data, depending on the loading * path taken. This is useful if you want to skip decoding, e.g. when preloading * the image, or retrieving metadata. */ - (RCTImageLoaderCancellationBlock)_loadImageOrDataWithURLRequest:(NSURLRequest *)request size:(CGSize)size scale:(CGFloat)scale resizeMode:(RCTResizeMode)resizeMode progressBlock:(RCTImageLoaderProgressBlock)progressHandler partialLoadBlock:(RCTImageLoaderPartialLoadBlock)partialLoadHandler completionBlock:(void (^)(NSError *error, id imageOrData, BOOL cacheResult, NSString *fetchDate))completionBlock { { NSMutableURLRequest *mutableRequest = [request mutableCopy]; [NSURLProtocol setProperty:@"RCTImageLoader" forKey:@"trackingName" inRequest:mutableRequest]; // Add missing png extension if (request.URL.fileURL && request.URL.pathExtension.length == 0) { mutableRequest.URL = [request.URL URLByAppendingPathExtension:@"png"]; } if (_redirectDelegate != nil) { mutableRequest.URL = [_redirectDelegate redirectAssetsURL:mutableRequest.URL]; } request = mutableRequest; } // Find suitable image URL loader id loadHandler = [self imageURLLoaderForURL:request.URL]; BOOL requiresScheduling = [loadHandler respondsToSelector:@selector(requiresScheduling)] ? [loadHandler requiresScheduling] : YES; __block atomic_bool cancelled = ATOMIC_VAR_INIT(NO); // TODO: Protect this variable shared between threads. __block dispatch_block_t cancelLoad = nil; void (^completionHandler)(NSError *, id, NSString *) = ^(NSError *error, id imageOrData, NSString *fetchDate) { cancelLoad = nil; BOOL cacheResult = [loadHandler respondsToSelector:@selector(shouldCacheLoadedImages)] ? [loadHandler shouldCacheLoadedImages] : YES; // If we've received an image, we should try to set it synchronously, // if it's data, do decoding on a background thread. if (RCTIsMainQueue() && ![imageOrData isKindOfClass:[UIImage class]]) { // Most loaders do not return on the main thread, so caller is probably not // expecting it, and may do expensive post-processing in the callback dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{ if (!atomic_load(&cancelled)) { completionBlock(error, imageOrData, cacheResult, fetchDate); } }); } else if (!atomic_load(&cancelled)) { completionBlock(error, imageOrData, cacheResult, fetchDate); } }; // If the loader doesn't require scheduling we call it directly on // the main queue. if (loadHandler && !requiresScheduling) { return [loadHandler loadImageForURL:request.URL size:size scale:scale resizeMode:resizeMode progressHandler:progressHandler partialLoadHandler:partialLoadHandler completionHandler:^(NSError *error, UIImage *image){ completionHandler(error, image, nil); }]; } // All access to URL cache must be serialized if (!_URLRequestQueue) { [self setUp]; } __weak RCTImageLoader *weakSelf = self; dispatch_async(_URLRequestQueue, ^{ __typeof(self) strongSelf = weakSelf; if (atomic_load(&cancelled) || !strongSelf) { return; } if (loadHandler) { cancelLoad = [loadHandler loadImageForURL:request.URL size:size scale:scale resizeMode:resizeMode progressHandler:progressHandler partialLoadHandler:partialLoadHandler completionHandler:^(NSError *error, UIImage *image) { completionHandler(error, image, nil); }]; } else { // Use networking module to load image cancelLoad = [strongSelf _loadURLRequest:request progressBlock:progressHandler completionBlock:completionHandler]; } }); return ^{ BOOL alreadyCancelled = atomic_fetch_or(&cancelled, 1); if (alreadyCancelled) { return; } dispatch_block_t cancelLoadLocal = cancelLoad; cancelLoad = nil; if (cancelLoadLocal) { cancelLoadLocal(); } }; } - (RCTImageLoaderCancellationBlock)_loadURLRequest:(NSURLRequest *)request progressBlock:(RCTImageLoaderProgressBlock)progressHandler completionBlock:(void (^)(NSError *error, id imageOrData, NSString *fetchDate))completionHandler { // Check if networking module is available if (RCT_DEBUG && ![_bridge respondsToSelector:@selector(networking)]) { RCTLogError(@"No suitable image URL loader found for %@. You may need to " " import the RCTNetwork library in order to load images.", request.URL.absoluteString); return NULL; } RCTNetworking *networking = [_bridge networking]; // Check if networking module can load image if (RCT_DEBUG && ![networking canHandleRequest:request]) { RCTLogError(@"No suitable image URL loader found for %@", request.URL.absoluteString); return NULL; } // Use networking module to load image RCTURLRequestCompletionBlock processResponse = ^(NSURLResponse *response, NSData *data, NSError *error) { // Check for system errors if (error) { completionHandler(error, nil, nil); return; } else if (!response) { completionHandler(RCTErrorWithMessage(@"Response metadata error"), nil, nil); return; } else if (!data) { completionHandler(RCTErrorWithMessage(@"Unknown image download error"), nil, nil); return; } // Check for http errors NSString *responseDate; if ([response isKindOfClass:[NSHTTPURLResponse class]]) { NSInteger statusCode = ((NSHTTPURLResponse *)response).statusCode; if (statusCode != 200) { NSString *errorMessage = [NSString stringWithFormat:@"Failed to load %@", response.URL]; NSDictionary *userInfo = @{NSLocalizedDescriptionKey: errorMessage}; completionHandler([[NSError alloc] initWithDomain:NSURLErrorDomain code:statusCode userInfo:userInfo], nil, nil); return; } responseDate = ((NSHTTPURLResponse *)response).allHeaderFields[@"Date"]; } // Call handler completionHandler(nil, data, responseDate); }; // Download image __weak __typeof(self) weakSelf = self; __block RCTNetworkTask *task = [networking networkTaskWithRequest:request completionBlock:^(NSURLResponse *response, NSData *data, NSError *error) { __typeof(self) strongSelf = weakSelf; if (!strongSelf) { return; } if (error || !response || !data) { NSError *someError = nil; if (error) { someError = error; } else if (!response) { someError = RCTErrorWithMessage(@"Response metadata error"); } else { someError = RCTErrorWithMessage(@"Unknown image download error"); } completionHandler(someError, nil, nil); [strongSelf dequeueTasks]; return; } dispatch_async(strongSelf->_URLRequestQueue, ^{ // Process image data processResponse(response, data, nil); // Prepare for next task [strongSelf dequeueTasks]; }); }]; task.downloadProgressBlock = ^(int64_t progress, int64_t total) { if (progressHandler) { progressHandler(progress, total); } }; if (task) { if (!_pendingTasks) { _pendingTasks = [NSMutableArray new]; } [_pendingTasks addObject:task]; [self dequeueTasks]; } return ^{ __typeof(self) strongSelf = weakSelf; if (!strongSelf || !task) { return; } dispatch_async(strongSelf->_URLRequestQueue, ^{ [task cancel]; task = nil; }); [strongSelf dequeueTasks]; }; } - (RCTImageLoaderCancellationBlock)loadImageWithURLRequest:(NSURLRequest *)imageURLRequest size:(CGSize)size scale:(CGFloat)scale clipped:(BOOL)clipped resizeMode:(RCTResizeMode)resizeMode progressBlock:(RCTImageLoaderProgressBlock)progressBlock partialLoadBlock:(RCTImageLoaderPartialLoadBlock)partialLoadBlock completionBlock:(RCTImageLoaderCompletionBlock)completionBlock { __block atomic_bool cancelled = ATOMIC_VAR_INIT(NO); // TODO: Protect this variable shared between threads. __block dispatch_block_t cancelLoad = nil; dispatch_block_t cancellationBlock = ^{ BOOL alreadyCancelled = atomic_fetch_or(&cancelled, 1); if (alreadyCancelled) { return; } dispatch_block_t cancelLoadLocal = cancelLoad; cancelLoad = nil; if (cancelLoadLocal) { cancelLoadLocal(); } }; __weak RCTImageLoader *weakSelf = self; void (^completionHandler)(NSError *, id, BOOL, NSString *) = ^(NSError *error, id imageOrData, BOOL cacheResult, NSString *fetchDate) { __typeof(self) strongSelf = weakSelf; if (atomic_load(&cancelled) || !strongSelf) { return; } if (!imageOrData || [imageOrData isKindOfClass:[UIImage class]]) { cancelLoad = nil; completionBlock(error, imageOrData); return; } // Check decoded image cache if (cacheResult) { UIImage *image = [[strongSelf imageCache] imageForUrl:imageURLRequest.URL.absoluteString size:size scale:scale resizeMode:resizeMode responseDate:fetchDate]; if (image) { cancelLoad = nil; completionBlock(nil, image); return; } } RCTImageLoaderCompletionBlock decodeCompletionHandler = ^(NSError *error_, UIImage *image) { if (cacheResult && image) { // Store decoded image in cache [[strongSelf imageCache] addImageToCache:image URL:imageURLRequest.URL.absoluteString size:size scale:scale resizeMode:resizeMode responseDate:fetchDate]; } cancelLoad = nil; completionBlock(error_, image); }; cancelLoad = [strongSelf decodeImageData:imageOrData size:size scale:scale clipped:clipped resizeMode:resizeMode completionBlock:decodeCompletionHandler]; }; cancelLoad = [self _loadImageOrDataWithURLRequest:imageURLRequest size:size scale:scale resizeMode:resizeMode progressBlock:progressBlock partialLoadBlock:partialLoadBlock completionBlock:completionHandler]; return cancellationBlock; } - (RCTImageLoaderCancellationBlock)decodeImageData:(NSData *)data size:(CGSize)size scale:(CGFloat)scale clipped:(BOOL)clipped resizeMode:(RCTResizeMode)resizeMode completionBlock:(RCTImageLoaderCompletionBlock)completionBlock { if (data.length == 0) { completionBlock(RCTErrorWithMessage(@"No image data"), nil); return ^{}; } __block atomic_bool cancelled = ATOMIC_VAR_INIT(NO); void (^completionHandler)(NSError *, UIImage *) = ^(NSError *error, UIImage *image) { if (RCTIsMainQueue()) { // Most loaders do not return on the main thread, so caller is probably not // expecting it, and may do expensive post-processing in the callback dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{ if (!atomic_load(&cancelled)) { completionBlock(error, clipped ? RCTResizeImageIfNeeded(image, size, scale, resizeMode) : image); } }); } else if (!atomic_load(&cancelled)) { completionBlock(error, clipped ? RCTResizeImageIfNeeded(image, size, scale, resizeMode) : image); } }; id imageDecoder = [self imageDataDecoderForData:data]; if (imageDecoder) { return [imageDecoder decodeImageData:data size:size scale:scale resizeMode:resizeMode completionHandler:completionHandler] ?: ^{}; } else { dispatch_block_t decodeBlock = ^{ // Calculate the size, in bytes, that the decompressed image will require NSInteger decodedImageBytes = (size.width * scale) * (size.height * scale) * 4; // Mark these bytes as in-use self->_activeBytes += decodedImageBytes; // Do actual decompression on a concurrent background queue dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{ if (!atomic_load(&cancelled)) { // Decompress the image data (this may be CPU and memory intensive) UIImage *image = RCTDecodeImageWithData(data, size, scale, resizeMode); #if RCT_DEV CGSize imagePixelSize = RCTSizeInPixels(image.size, image.scale); CGSize screenPixelSize = RCTSizeInPixels(RCTScreenSize(), RCTScreenScale()); if (imagePixelSize.width * imagePixelSize.height > screenPixelSize.width * screenPixelSize.height) { RCTLogInfo(@"[PERF ASSETS] Loading image at size %@, which is larger " "than the screen size %@", NSStringFromCGSize(imagePixelSize), NSStringFromCGSize(screenPixelSize)); } #endif if (image) { completionHandler(nil, image); } else { NSString *errorMessage = [NSString stringWithFormat:@"Error decoding image data ", data, data.length]; NSError *finalError = RCTErrorWithMessage(errorMessage); completionHandler(finalError, nil); } } // We're no longer retaining the uncompressed data, so now we'll mark // the decoding as complete so that the loading task queue can resume. dispatch_async(self->_URLRequestQueue, ^{ self->_scheduledDecodes--; self->_activeBytes -= decodedImageBytes; [self dequeueTasks]; }); }); }; if (!_URLRequestQueue) { [self setUp]; } dispatch_async(_URLRequestQueue, ^{ // The decode operation retains the compressed image data until it's // complete, so we'll mark it as having started, in order to block // further image loads from happening until we're done with the data. self->_scheduledDecodes++; if (!self->_pendingDecodes) { self->_pendingDecodes = [NSMutableArray new]; } NSInteger activeDecodes = self->_scheduledDecodes - self->_pendingDecodes.count - 1; if (activeDecodes == 0 || (self->_activeBytes <= self->_maxConcurrentDecodingBytes && activeDecodes <= self->_maxConcurrentDecodingTasks)) { decodeBlock(); } else { [self->_pendingDecodes addObject:decodeBlock]; } }); return ^{ atomic_store(&cancelled, YES); }; } } - (RCTImageLoaderCancellationBlock)getImageSizeForURLRequest:(NSURLRequest *)imageURLRequest block:(void(^)(NSError *error, CGSize size))callback { void (^completion)(NSError *, id, BOOL, NSString *) = ^(NSError *error, id imageOrData, BOOL cacheResult, NSString *fetchDate) { CGSize size; if ([imageOrData isKindOfClass:[NSData class]]) { NSDictionary *meta = RCTGetImageMetadata(imageOrData); NSInteger imageOrientation = [meta[(id)kCGImagePropertyOrientation] integerValue]; switch (imageOrientation) { case kCGImagePropertyOrientationLeft: case kCGImagePropertyOrientationRight: case kCGImagePropertyOrientationLeftMirrored: case kCGImagePropertyOrientationRightMirrored: // swap width and height size = (CGSize){ [meta[(id)kCGImagePropertyPixelHeight] doubleValue], [meta[(id)kCGImagePropertyPixelWidth] doubleValue], }; break; case kCGImagePropertyOrientationUp: case kCGImagePropertyOrientationDown: case kCGImagePropertyOrientationUpMirrored: case kCGImagePropertyOrientationDownMirrored: default: size = (CGSize){ [meta[(id)kCGImagePropertyPixelWidth] doubleValue], [meta[(id)kCGImagePropertyPixelHeight] doubleValue], }; break; } } else { UIImage *image = imageOrData; size = (CGSize){ image.size.width * image.scale, image.size.height * image.scale, }; } callback(error, size); }; return [self _loadImageOrDataWithURLRequest:imageURLRequest size:CGSizeZero scale:1 resizeMode:RCTResizeModeStretch progressBlock:NULL partialLoadBlock:NULL completionBlock:completion]; } #pragma mark - RCTURLRequestHandler - (BOOL)canHandleRequest:(NSURLRequest *)request { NSURL *requestURL = request.URL; // If the data being loaded is a video, return NO // Even better may be to implement this on the RCTImageURLLoader that would try to load it, // but we'd have to run the logic both in RCTPhotoLibraryImageLoader and // RCTAssetsLibraryRequestHandler. Once we drop iOS7 though, we'd drop // RCTAssetsLibraryRequestHandler and can move it there. static NSRegularExpression *videoRegex = nil; if (!videoRegex) { NSError *error = nil; videoRegex = [NSRegularExpression regularExpressionWithPattern:@"(?:&|^)ext=MOV(?:&|$)" options:NSRegularExpressionCaseInsensitive error:&error]; if (error) { RCTLogError(@"%@", error); } } NSString *query = requestURL.query; if (query != nil && [videoRegex firstMatchInString:query options:0 range:NSMakeRange(0, query.length)]) { return NO; } for (id loader in _loaders) { // Don't use RCTImageURLLoader protocol for modules that already conform to // RCTURLRequestHandler as it's inefficient to decode an image and then // convert it back into data if (![loader conformsToProtocol:@protocol(RCTURLRequestHandler)] && [loader canLoadImageURL:requestURL]) { return YES; } } return NO; } - (id)sendRequest:(NSURLRequest *)request withDelegate:(id)delegate { __block RCTImageLoaderCancellationBlock requestToken; requestToken = [self loadImageWithURLRequest:request callback:^(NSError *error, UIImage *image) { if (error) { [delegate URLRequest:requestToken didCompleteWithError:error]; return; } NSString *mimeType = nil; NSData *imageData = nil; if (RCTImageHasAlpha(image.CGImage)) { mimeType = @"image/png"; imageData = UIImagePNGRepresentation(image); } else { mimeType = @"image/jpeg"; imageData = UIImageJPEGRepresentation(image, 1.0); } NSURLResponse *response = [[NSURLResponse alloc] initWithURL:request.URL MIMEType:mimeType expectedContentLength:imageData.length textEncodingName:nil]; [delegate URLRequest:requestToken didReceiveResponse:response]; [delegate URLRequest:requestToken didReceiveData:imageData]; [delegate URLRequest:requestToken didCompleteWithError:nil]; }]; return requestToken; } - (void)cancelRequest:(id)requestToken { if (requestToken) { ((RCTImageLoaderCancellationBlock)requestToken)(); } } @end @implementation RCTBridge (RCTImageLoader) - (RCTImageLoader *)imageLoader { return [self moduleForClass:[RCTImageLoader class]]; } @end