RCTImagePicker now uses main thread

Summary: public

RCTImagePicker (aka ImagePickerIOS) was previously displaying UI from a random thread, which is unsafe. This diff forces it to execute on the main thread instead.

Reviewed By: jspahrsummers

Differential Revision: D2657465

fb-gh-sync-id: 3c0fa6935061ccaa3e6ce649b4e3e8ad8c701384

Libraries/CameraRoll/RCTImagePickerManager.m

@@ -42,6 +42,11 @@ RCT_EXPORT_MODULE(ImagePickerIOS);
   return self;
 }
 
+- (dispatch_queue_t)methodQueue
+{
+  return dispatch_get_main_queue();
+}
+
 RCT_EXPORT_METHOD(canRecordVideos:(RCTResponseSenderBlock)callback)
 {
   NSArray<NSString *> *availableMediaTypes = [UIImagePickerController availableMediaTypesForSourceType:UIImagePickerControllerSourceTypeCamera];

Libraries/RCTTest/RCTSnapshotManager.m

@@ -37,7 +37,8 @@
 
 RCT_EXPORT_MODULE()
 
-- (UIView *)view {
+- (UIView *)view
+{
   return [RCTSnapshotView new];
 }
 

React/Modules/RCTStatusBarManager.m

@@ -52,7 +52,6 @@ RCT_EXPORT_MODULE()
     NSNotificationCenter *nc = [NSNotificationCenter defaultCenter];
     [nc addObserver:self selector:@selector(applicationDidChangeStatusBarFrame:) name:UIApplicationDidChangeStatusBarFrameNotification object:nil];
     [nc addObserver:self selector:@selector(applicationWillChangeStatusBarFrame:) name:UIApplicationWillChangeStatusBarFrameNotification object:nil];
-
   }
   return self;
 }
@@ -72,10 +71,10 @@ RCT_EXPORT_MODULE()
   CGRect frame = [notification.userInfo[UIApplicationStatusBarFrameUserInfoKey] CGRectValue];
   NSDictionary *event = @{
     @"frame": @{
-        @"x": @(frame.origin.x),
-        @"y": @(frame.origin.y),
-        @"width": @(frame.size.width),
-        @"height": @(frame.size.height),
+      @"x": @(frame.origin.x),
+      @"y": @(frame.origin.y),
+      @"width": @(frame.size.width),
+      @"height": @(frame.size.height),
     },
   };
   [_bridge.eventDispatcher sendDeviceEventWithName:eventName body:event];