ios - AVCaptureSession 和预览层不填满整个屏幕

Question

所以，我尝试在我的应用程序中使用手机上的摄像头，我成功了，但不幸的是，在使用预览时，图层没有填满整个屏幕 Here is an image to show you what it looks like

这是我的代码:

if let previewLayer = AVCaptureVideoPreviewLayer(session: captureSession) {
        self.previewLayer = previewLayer
        self.view.layer.addSublayer(self.previewLayer)
        self.previewLayer.frame = self.view.layer.frame
        captureSession.startRunning()

        let dataOutput = AVCaptureVideoDataOutput()
        dataOutput.videoSettings = [(kCVPixelBufferPixelFormatTypeKey as NSString):NSNumber(value:kCVPixelFormatType_32BGRA)]

        dataOutput.alwaysDiscardsLateVideoFrames = true

        if captureSession.canAddOutput(dataOutput) {
            captureSession.addOutput(dataOutput)
        }

        captureSession.commitConfiguration()


        let queue = DispatchQueue(label: "com.Osmo.captureQueue")
        dataOutput.setSampleBufferDelegate(self, queue: queue)
    }

Answer 1

这可能是因为您试图从具有自动布局约束的 View 中设置预览图层的框架。尝试将 viewDidLayoutSubviews 方法的覆盖添加到您的 View Controller :

override func viewDidLayoutSubviews() {
    super.viewDidLayoutSubviews()
    self.previewLayer.frame = self.view.layer.bounds
}