Changed front-facing camera so that it shows consistent image during capture and preview

Summary: Changed front-facing camera so that it shows consistent image during capture and preview

Reviewed By: mmmulani

Differential Revision: D13012715

fbshipit-source-id: 043cd9178fc49ef9e8e628a866dd8e52434f7306

Author: Enrico Bern Hardy Tanuwidjaja

Libraries/CameraRoll/RCTImagePickerManager.m

@@ -16,6 +16,16 @@
 #import <React/RCTRootView.h>
 #import <React/RCTUtils.h>
 
+@interface RCTImagePickerController : UIImagePickerController
+
+@property (nonatomic, assign) BOOL unmirrorFrontFacingCamera;
+
+@end
+
+@implementation RCTImagePickerController
+
+@end
+
 @interface RCTImagePickerManager () <UIImagePickerControllerDelegate, UINavigationControllerDelegate>
 
 @end
@@ -31,6 +41,22 @@ @implementation RCTImagePickerManager
 
 @synthesize bridge = _bridge;
 
+- (id)init
+{
+  if (self = [super init]) {
+    [[NSNotificationCenter defaultCenter] addObserver:self
+                                             selector:@selector(cameraChanged:)
+                                                 name:@"AVCaptureDeviceDidStartRunningNotification"
+                                               object:nil];
+  }
+  return self;
+}
+
+- (void)dealloc
+{
+    [[NSNotificationCenter defaultCenter] removeObserver:self name:@"AVCaptureDeviceDidStartRunningNotification" object:nil];
+}
+
 - (dispatch_queue_t)methodQueue
 {
   return dispatch_get_main_queue();
@@ -56,9 +82,10 @@ - (dispatch_queue_t)methodQueue
     return;
   }
 
-  UIImagePickerController *imagePicker = [UIImagePickerController new];
+  RCTImagePickerController *imagePicker = [RCTImagePickerController new];
   imagePicker.delegate = self;
   imagePicker.sourceType = UIImagePickerControllerSourceTypeCamera;
+  imagePicker.unmirrorFrontFacingCamera = [RCTConvert BOOL:config[@"unmirrorFrontFacingCamera"]];
 
   if ([RCTConvert BOOL:config[@"videoMode"]]) {
     imagePicker.cameraCaptureMode = UIImagePickerControllerCameraCaptureModeVideo;
@@ -175,4 +202,17 @@ - (void)_dismissPicker:(UIImagePickerController *)picker args:(NSArray *)args
   }
 }
 
+- (void)cameraChanged:(NSNotification *)notification
+{
+  for (UIImagePickerController *picker in _pickers) {
+    if ([picker isKindOfClass:[RCTImagePickerController class]]
+      && ((RCTImagePickerController *)picker).unmirrorFrontFacingCamera
+      && picker.cameraDevice == UIImagePickerControllerCameraDeviceFront) {
+      picker.cameraViewTransform = CGAffineTransformScale(CGAffineTransformIdentity, -1, 1);
+    } else {
+      picker.cameraViewTransform = CGAffineTransformIdentity;
+    }
+  }
+}
+
 @end