Add the `mirrorImage` prop will will mirror the resulting image when true.

Camera.js

@@ -82,6 +82,7 @@ export default class Camera extends Component {
     onBarCodeRead: PropTypes.func,
     onFocusChanged: PropTypes.func,
     onZoomChanged: PropTypes.func,
+    mirrorImage: PropTypes.bool,
     orientation: PropTypes.oneOfType([
       PropTypes.string,
       PropTypes.number
@@ -106,7 +107,8 @@ export default class Camera extends Component {
     captureQuality: CameraManager.CaptureQuality.high,
     defaultOnFocusComponent: true,
     flashMode: CameraManager.FlashMode.off,
-    torchMode: CameraManager.TorchMode.off
+    torchMode: CameraManager.TorchMode.off,
+    mirrorImage: false,
   };
 
   static checkDeviceAuthorizationStatus = CameraManager.checkDeviceAuthorizationStatus;

README.md

@@ -224,6 +224,10 @@ By default, `onZoomChanged` is not defined and pinch-to-zoom is disabled.
 
 If set to `true`, the device will not sleep while the camera preview is visible. This mimics the behavior of the default camera app, which keeps the device awake while open.
 
+#### `iOS` `mirrorImage`
+
+If set to `true`, the image returned will be mirrored..
+
 ## Component instance methods
 
 You can access component methods by adding a `ref` (ie. `ref="camera"`) prop to your `<Camera>` element, then you can use `this.refs.camera.capture(cb)`, etc. inside your component.

ios/RCTCamera.m

@@ -68,6 +68,11 @@
   }
 }
 
+- (void)setMirrorImage:(BOOL)mirrorImage
+{
+  [self.manager changeMirrorImage:mirrorImage];
+}
+
 - (void)setFlashMode:(NSInteger)flashMode
 {
   [self.manager changeFlashMode:flashMode];

ios/RCTCameraManager.h

@@ -59,6 +59,7 @@ typedef NS_ENUM(NSInteger, RCTCameraTorchMode) {
 @property (nonatomic, assign) NSInteger presetCamera;
 @property (nonatomic, strong) AVCaptureVideoPreviewLayer *previewLayer;
 @property (nonatomic, assign) NSInteger videoTarget;
+@property (nonatomic, assign) BOOL mirrorImage;
 @property (nonatomic, strong) RCTPromiseResolveBlock videoResolve;
 @property (nonatomic, strong) RCTPromiseRejectBlock videoReject;
 @property (nonatomic, strong) RCTCamera *camera;
@@ -67,6 +68,7 @@ typedef NS_ENUM(NSInteger, RCTCameraTorchMode) {
 - (void)changeAspect:(NSString *)aspect;
 - (void)changeCamera:(NSInteger)camera;
 - (void)changeOrientation:(NSInteger)orientation;
+- (void)changeMirrorImage:(BOOL)mirrorImage;
 - (void)changeFlashMode:(NSInteger)flashMode;
 - (void)changeTorchMode:(NSInteger)torchMode;
 - (AVCaptureDevice *)deviceWithMediaType:(NSString *)mediaType preferringPosition:(AVCaptureDevicePosition)position;

ios/RCTCameraManager.m

@@ -31,6 +31,7 @@ RCT_EXPORT_VIEW_PROPERTY(orientation, NSInteger);
 RCT_EXPORT_VIEW_PROPERTY(flashMode, NSInteger);
 RCT_EXPORT_VIEW_PROPERTY(torchMode, NSInteger);
 RCT_EXPORT_VIEW_PROPERTY(keepAwake, BOOL);
+RCT_EXPORT_VIEW_PROPERTY(mirrorImage, BOOL);
 
 - (NSDictionary *)constantsToExport
 {
@@ -143,6 +144,7 @@ RCT_EXPORT_VIEW_PROPERTY(onZoomChanged, BOOL)
 - (id)init {
 
   if ((self = [super init])) {
+    self.mirrorImage = false;
 
     self.session = [AVCaptureSession new];
 
@@ -246,6 +248,10 @@ RCT_EXPORT_METHOD(changeOrientation:(NSInteger)orientation) {
   }
 }
 
+RCT_EXPORT_METHOD(changeMirrorImage:(BOOL)mirrorImage) {
+  self.mirrorImage = mirrorImage;
+}
+
 RCT_EXPORT_METHOD(changeTorchMode:(NSInteger)torchMode) {
   AVCaptureDevice *device = [self.videoCaptureDeviceInput device];
   NSError *error = nil;
@@ -579,6 +585,12 @@ RCT_EXPORT_METHOD(hasFlash:(RCTPromiseResolveBlock)resolve reject:(RCTPromiseRej
   CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB();
   CGContextRef bmContext = CGBitmapContextCreate(NULL, rotatedRect.size.width, rotatedRect.size.height, 8, 0, colorSpace, (CGBitmapInfo) kCGImageAlphaPremultipliedFirst);
 
+  if (self.mirrorImage) {
+    CGAffineTransform transform = CGAffineTransformMakeTranslation(rotatedRect.size.width, 0.0);
+    transform = CGAffineTransformScale(transform, -1.0, 1.0);
+    CGContextConcatCTM(bmContext, transform);
+  }
+
   CGContextSetAllowsAntialiasing(bmContext, TRUE);
   CGContextSetInterpolationQuality(bmContext, kCGInterpolationNone);