我读了大约一百万个线程,关于如何让一个VideoPreviewLayer填满iPhone的整个屏幕,但没有任何作用......也许你可以帮助我,因为我真的被卡住了。
这是我的预览层init:
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];
这是我的setupAvCapture方法:
//-- 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];
我已经尝试使用不同的AVCaptureSessionPresets和ResizeFit选项。但它总是这样:
http://imageshack.us/photo/my-images/707/img0013g.png/
或者如果我使用previewLayer.videoGravity = AVLayerVideoGravityResizeAspectFill;如果我记录图层的大小,则返回正确的全屏大小。
答案 0 :(得分:55)
尝试:
AVCaptureVideoPreviewLayer *captureVideoPreviewLayer = [AVCaptureVideoPreviewLayer layerWithSession: self.session];
[captureVideoPreviewLayer setVideoGravity:AVLayerVideoGravityResizeAspectFill];
快速更新
let previewLayer = AVCaptureVideoPreviewLayer(session: session)
previewLayer.videoGravity = AVLayerVideoGravityResizeAspectFill
Swift 4.0更新
let previewLayer = AVCaptureVideoPreviewLayer(session: session)
previewLayer.videoGravity = AVLayerVideoGravity.resizeAspectFill
答案 1 :(得分:4)
如果有人遇到此问题,您只需要限制屏幕范围即可
Boolean international_F = "Y".equals(in.next()); // next returns a string
Boolean international_F =in.next().charAt(0) == 'Y';