前置摄像头填充圆形UIView

在我正在开发的应用程序中，用户需要采取“自拍”（是的，我知道，但该应用程序仅供私人使用）。

我已经把所有东西都用在圆形UIView区域中显示的相机上，但是我无法将其缩放并正确填充圆圈。 这是它现在正在做的事情：

这就是我希望它做的事情：

这是我的UIView的代码：

var cameraView = UIView() cameraView.frame = CGRectMake(100, self.view.center.y-260, 568, 568) cameraView.backgroundColor = UIColor(red:26/255, green:188/255, blue:156/255, alpha:1) cameraView.layer.cornerRadius = 284 cameraView.layer.borderColor = UIColor.whiteColor().CGColor cameraView.layer.borderWidth = 15 cameraView.contentMode = UIViewContentMode.ScaleToFill cameraView.layer.masksToBounds = true 

我尝试了一些不同的contentMode选项，包括ScaleToFill，ScaleAspectFill和ScaleAspectFit。 它们都会产生完全相同的结果。

Answer 1

事实certificate，相机的“self.previewLayer”具有一个属性，可以确定相机的内容如何填充视图。

在下面的代码中，我将“self.previewLayer.videoGravity = AVLayerVideoGravityResizeAspect”更改为“self.previewLayer.videoGravity = AVLayerVideoGravityResizeAspectFill”

 extension SelfieViewController: AVCaptureVideoDataOutputSampleBufferDelegate{ func setupAVCapture(){ session.sessionPreset = AVCaptureSessionPreset640x480 let devices = AVCaptureDevice.devices(); // Loop through all the capture devices on this phone for device in devices { // Make sure this particular device supports video if (device.hasMediaType(AVMediaTypeVideo)) { // Finally check the position and confirm we've got the front camera if(device.position == AVCaptureDevicePosition.Front) { captureDevice = device as? AVCaptureDevice if captureDevice != nil { beginSession() break } } } } } func beginSession(){ var err : NSError? = nil var deviceInput:AVCaptureDeviceInput = AVCaptureDeviceInput(device: captureDevice, error: &err) if err != nil { println("error: \(err?.localizedDescription)") } if self.session.canAddInput(deviceInput){ self.session.addInput(deviceInput) } self.videoDataOutput = AVCaptureVideoDataOutput() var rgbOutputSettings = [NSNumber(integer: kCMPixelFormat_32BGRA):kCVPixelBufferPixelFormatTypeKey] self.videoDataOutput.alwaysDiscardsLateVideoFrames=true self.videoDataOutputQueue = dispatch_queue_create("VideoDataOutputQueue", DISPATCH_QUEUE_SERIAL) self.videoDataOutput.setSampleBufferDelegate(self, queue:self.videoDataOutputQueue) if session.canAddOutput(self.videoDataOutput){ session.addOutput(self.videoDataOutput) } self.videoDataOutput.connectionWithMediaType(AVMediaTypeVideo).enabled = true self.previewLayer = AVCaptureVideoPreviewLayer(session: self.session) self.previewLayer.videoGravity = AVLayerVideoGravityResizeAspectFill var rootLayer :CALayer = self.cameraView.layer rootLayer.masksToBounds=true self.previewLayer.frame = rootLayer.bounds rootLayer.addSublayer(self.previewLayer) session.startRunning() } func captureOutput(captureOutput: AVCaptureOutput!, didOutputSampleBuffer sampleBuffer: CMSampleBuffer!, fromConnection connection: AVCaptureConnection!) { // do stuff here } // clean up AVCapture func stopCamera(){ session.stopRunning() } }