AVCaptureVideoPreviewLayerが画面に表示されない

Question

VideoPreviewLayerをiPhoneの完全な画面に埋め込む方法について、約100万本のスレッドを読みましたが、何も問題ありません。

これは私のプレビュー層のinitです：

if (UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPad) 
{ 
    // Choosing bigger preset for bigger screen. 
    _sessionPreset = AVCaptureSessionPreset1280x720; 
} 
else 
{ 
    _sessionPreset = AVCaptureSessionPresetHigh; 
} 

[self setupAVCapture]; 

AVCaptureSession *captureSession = _session; 
AVCaptureVideoPreviewLayer *previewLayer = [AVCaptureVideoPreviewLayer layerWithSession:captureSession]; 
UIView *aView = self.view; 
previewLayer.frame = aView.bounds; 
previewLayer.connection.videoOrientation = AVCaptureVideoOrientationLandscapeRight; 
[aView.layer addSublayer:previewLayer]; 

私setupAvCapture方法です：

//-- Setup Capture Session. 
_session = [[AVCaptureSession alloc] init]; 
[_session beginConfiguration]; 

//-- Set preset session size. 
[_session setSessionPreset:_sessionPreset]; 

//-- Creata a video device and input from that Device. Add the input to the capture session. 
AVCaptureDevice * videoDevice = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo]; 
if(videoDevice == nil) 
    assert(0); 

//-- Add the device to the session. 
NSError *error; 
AVCaptureDeviceInput *input = [AVCaptureDeviceInput deviceInputWithDevice:videoDevice error:&error]; 
if(error) 
    assert(0); 

[_session addInput:input]; 

//-- Create the output for the capture session. 
AVCaptureVideoDataOutput * dataOutput = [[AVCaptureVideoDataOutput alloc] init]; 
[dataOutput setAlwaysDiscardsLateVideoFrames:YES]; // Probably want to set this to NO when recording 

//-- Set to YUV420. 
[dataOutput setVideoSettings:[NSDictionary dictionaryWithObject:[NSNumber numberWithInt:kCVPixelFormatType_420YpCbCr8BiPlanarFullRange] 
                 forKey:(id)kCVPixelBufferPixelFormatTypeKey]]; // Necessary for manual preview 

// Set dispatch to be on the main thread so OpenGL can do things with the data 
[dataOutput setSampleBufferDelegate:self queue:dispatch_get_main_queue()]; 

[_session addOutput:dataOutput]; 
[_session commitConfiguration]; 

[_session startRunning]; 

私はすでに別のAVCaptureSessionPresetsとResizeFitオプションを使用しようとしました。しかし、それは常に次のようになります。

http://imageshack.us/photo/my-images/707/img0013g.png/

かを、この私が使用している場合previewLayer.videoGravity = AVLayerVideoGravityResizeAspectFill。レイヤーのサイズをログに記録すると、正しいフルスクリーンサイズが返されます。

http://imageshack.us/photo/my-images/194/img0014k.png/

Answer 1

試してみてください。

AVCaptureVideoPreviewLayer *captureVideoPreviewLayer = [AVCaptureVideoPreviewLayer layerWithSession: self.session]; 
[captureVideoPreviewLayer setVideoGravity:AVLayerVideoGravityResizeAspectFill]; 

スウィフト更新

let previewLayer = AVCaptureVideoPreviewLayer(session: session) 
previewLayer.videoGravity = AVLayerVideoGravityResizeAspectFill 

スウィフト4.0アップデート

let previewLayer = AVCaptureVideoPreviewLayer(session: session) 
previewLayer.videoGravity = AVLayerVideoGravity.resizeAspectFill