iphone - iOS中的双摄像头输出

Question

我想在 iOS 上使用内置摄像头制作双屏

我尝试了以下代码，但它只显示一个 View 。

这是一个自然的结果，我知道。

这是我使用的代码..

- (void)prepareCameraView:(UIView *)window
{
    AVCaptureSession *session = [[AVCaptureSession alloc] init];
    session.sessionPreset = AVCaptureSessionPresetMedium;

    CALayer *viewLayer = window.layer;
    NSLog(@"viewLayer = %@", viewLayer);

    AVCaptureVideoPreviewLayer *captureVideoPreviewLayer = [[AVCaptureVideoPreviewLayer alloc] 
                                                            initWithSession:session];
    captureVideoPreviewLayer.frame = window.bounds;
    [window.layer addSublayer:captureVideoPreviewLayer];    
    AVCaptureDevice *captureDevice = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo];

    NSError *error = nil;
    AVCaptureDeviceInput *input = [AVCaptureDeviceInput deviceInputWithDevice:captureDevice error:&error];
    if (!input) 
    {
        NSLog(@"ERROR : trying to open camera : %@", error);
    }

    [session addInput:input];

    [session startRunning];
}

如何在 iOS 上获得双屏？

Answer 1

 // Use this code





  AVCaptureSession *session = [AVCaptureSession new];
  AVCaptureDevice *inputDevice = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo];
NSError *error;
AVCaptureDeviceInput *deviceInput = [AVCaptureDeviceInput deviceInputWithDevice:inputDevice error:&error];

if ( [session canAddInput:deviceInput])
{
    [session addInput:deviceInput];
}
AVCaptureVideoPreviewLayer *previewLayer = [[AVCaptureVideoPreviewLayer alloc] initWithSession:session];
[previewLayer setVideoGravity:AVLayerVideoGravityResizeAspectFill];
[previewLayer setFrame:CGRectMake(0.0, 0.0, self.view.bounds.size.width, self.view.bounds.size.height)];

NSUInteger replicatorInstances = 2;
CGFloat replicatorViewHeight = (self.view.bounds.size.height - 64)/replicatorInstances;
CAReplicatorLayer *replicatorLayer = [CAReplicatorLayer layer];
replicatorLayer.frame = CGRectMake(0, 0.0, self.view.bounds.size.width, replicatorViewHeight);
replicatorLayer.instanceCount = replicatorInstances;
replicatorLayer.instanceTransform = CATransform3DMakeTranslation(0.0, replicatorViewHeight, 0.0);

[replicatorLayer addSublayer:previewLayer];
[self.view.layer addSublayer:replicatorLayer];
[session startRunning];