AVFoundation相机不可见

Question

我刚启动AVFoundation并尝试捕获图像，问题是我可以捕获图像但无法在视图中看到相机，这是我的代码：

     session = [AVCaptureSession new];
if([session canSetSessionPreset:AVCaptureSessionPresetHigh])
 [session setSessionPreset:AVCaptureSessionPresetHigh];//specifies photo quality

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

AVCaptureVideoPreviewLayer *previewLayer = [[AVCaptureVideoPreviewLayer alloc]initWithSession:session];
[previewLayer setVideoGravity:AVLayerVideoGravityResizeAspectFill];
CALayer *rootLayer = [[self view]layer];
[rootLayer setMasksToBounds:YES];
[previewLayer setFrame:_cameraView.frame];
[rootLayer insertSublayer:previewLayer atIndex:0];

stillImageOutput = [AVCaptureStillImageOutput new];
[stillImageOutput setOutputSettings:[[NSDictionary alloc]initWithObjectsAndKeys:AVVideoCodecJPEG,AVVideoCodecKey,nil]];
[session addOutput:stillImageOutput];
    [session startRunning];

我的代码有什么问题吗？

Answer 1

尝试[[rootLayer layer] addSublayer:previewLayer];

对我来说，它有效！