Adding support for camera switching (WIP)

Camera.ios.js

@@ -38,14 +38,17 @@ var Camera = React.createClass({
   render: function() {
     var style = flattenStyle([styles.base, this.props.style]);
     var aspect = this.props.aspect || 'Fill';
+    var camera = this.props.camera || 'Back';
     var orientation = this.props.orientation || 'Portrait';
 
     aspect = NativeModules.CameraManager.aspects[aspect];
+    camera = NativeModules.CameraManager.cameras[camera];
     orientation = NativeModules.CameraManager.orientations[orientation];
 
     var nativeProps = merge(this.props, {
       style,
       aspect: aspect,
+      camera: camera,
       orientation: orientation,
     });
 
@@ -54,7 +57,11 @@ var Camera = React.createClass({
 });
 
 var RCTCamera = createReactIOSNativeComponentClass({
-  validAttributes: merge(ReactIOSViewAttributes.UIView, { aspect: true, orientation: true }),
+  validAttributes: merge(ReactIOSViewAttributes.UIView, {
+    aspect: true,
+    camera: true,
+    orientation: true
+  }),
   uiViewClassName: 'RCTCamera',
 });
 

RCTCamera.h

@@ -1,4 +1,5 @@
 #import <UIKit/UIKit.h>
+#import <AVFoundation/AVFoundation.h>
 #import "ViewfinderView.h"
 
 @class AVCaptureSession;
@@ -7,5 +8,6 @@
 
 @property (nonatomic) AVCaptureSession *session;
 @property (nonatomic) ViewfinderView *viewfinder;
+@property (nonatomic) AVCaptureDeviceInput *captureDeviceInput;
 
-@end
+@end

RCTCamera.m

@@ -5,16 +5,42 @@
 
 @implementation RCTCamera
 
-- (void)setOrientation:(NSInteger)orientation
-{
-    [[(AVCaptureVideoPreviewLayer *)[[self viewfinder] layer] connection] setVideoOrientation:orientation];
-}
-
 - (void)setAspect:(NSString *)aspect
 {
     [(AVCaptureVideoPreviewLayer *)[[self viewfinder] layer] setVideoGravity:aspect];
 }
 
+- (void)setCamera:(NSInteger)camera
+{
+//    AVCaptureDevice *currentVideoDevice = [_captureDeviceInput device];
+    AVCaptureDevice *videoDevice = [self deviceWithMediaType:AVMediaTypeVideo preferringPosition:(AVCaptureDevicePosition)camera];
+    AVCaptureDeviceInput *videoDeviceInput = [AVCaptureDeviceInput deviceInputWithDevice:videoDevice error:nil];
+
+    [[self session] beginConfiguration];
+
+    [[self session] removeInput:[self captureDeviceInput]];
+    if ([[self session] canAddInput:videoDeviceInput])
+    {
+//        [[NSNotificationCenter defaultCenter] removeObserver:self name:AVCaptureDeviceSubjectAreaDidChangeNotification object:currentVideoDevice];
+//
+//        [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(subjectAreaDidChange:) name:AVCaptureDeviceSubjectAreaDidChangeNotification object:videoDevice];
+//
+        [[self session] addInput:videoDeviceInput];
+        [self setCaptureDeviceInput:videoDeviceInput];
+    }
+    else
+    {
+        [[self session] addInput:_captureDeviceInput];
+    }
+
+    [[self session] commitConfiguration];
+}
+
+- (void)setOrientation:(NSInteger)orientation
+{
+    [[(AVCaptureVideoPreviewLayer *)[[self viewfinder] layer] connection] setVideoOrientation:orientation];
+}
+
 - (id)init
 {
     if ((self = [super init])) {
@@ -27,30 +53,18 @@
 
         NSError *error = nil;
 
-        NSArray *devices = [AVCaptureDevice devicesWithMediaType:AVMediaTypeVideo];
-        AVCaptureDevice *captureDevice = [devices firstObject];
+        AVCaptureDevice *captureDevice = [self deviceWithMediaType:AVMediaTypeVideo preferringPosition:AVCaptureDevicePositionBack];
 
-        AVCaptureDevicePosition position = AVCaptureDevicePositionBack;
-
-        for (AVCaptureDevice *device in devices)
-        {
-            if ([device position] == position)
-            {
-                captureDevice = device;
-                break;
-            }
-        }
-
-        AVCaptureDeviceInput *captureDeviceInput = [AVCaptureDeviceInput deviceInputWithDevice:captureDevice error:&error];
+        _captureDeviceInput = [AVCaptureDeviceInput deviceInputWithDevice:captureDevice error:&error];
 
         if (error)
         {
             NSLog(@"%@", error);
         }
 
-        if ([session canAddInput:captureDeviceInput])
+        if ([session canAddInput:_captureDeviceInput])
         {
-            [session addInput:captureDeviceInput];
+            [session addInput:_captureDeviceInput];
 
             [[(AVCaptureVideoPreviewLayer *)[[self viewfinder] layer] connection] setVideoOrientation:AVCaptureVideoOrientationPortrait];
             [(AVCaptureVideoPreviewLayer *)[[self viewfinder] layer] setVideoGravity:AVLayerVideoGravityResizeAspectFill];
@@ -62,6 +76,23 @@
     return self;
 }
 
+- (AVCaptureDevice *)deviceWithMediaType:(NSString *)mediaType preferringPosition:(AVCaptureDevicePosition)position
+{
+    NSArray *devices = [AVCaptureDevice devicesWithMediaType:mediaType];
+    AVCaptureDevice *captureDevice = [devices firstObject];
+
+    for (AVCaptureDevice *device in devices)
+    {
+        if ([device position] == position)
+        {
+            captureDevice = device;
+            break;
+        }
+    }
+
+    return captureDevice;
+}
+
 - (NSArray *)reactSubviews
 {
     NSArray *subviews = @[_viewfinder];

RCTCameraManager.m

@@ -13,6 +13,7 @@
 }
 
 RCT_EXPORT_VIEW_PROPERTY(aspect, NSString);
+RCT_EXPORT_VIEW_PROPERTY(camera, NSInteger);
 RCT_EXPORT_VIEW_PROPERTY(orientation, NSInteger);
 
 - (NSDictionary *)constantsToExport
@@ -23,6 +24,10 @@ RCT_EXPORT_VIEW_PROPERTY(orientation, NSInteger);
         @"Fit": AVLayerVideoGravityResizeAspect,
         @"Fill": AVLayerVideoGravityResizeAspectFill
       },
+      @"cameras": @{
+        @"Front": @(AVCaptureDevicePositionFront),
+        @"Back": @(AVCaptureDevicePositionBack)
+      },
       @"orientations": @{
         @"LandscapeLeft": @(AVCaptureVideoOrientationLandscapeLeft),
         @"LandscapeRight": @(AVCaptureVideoOrientationLandscapeRight),