旋转后如何调整相机的宽高比？

Question

我有一个小的Swift程序来捕获视频。 如果我在横向模式下用手机启动应用程序，那么我会全屏显示

但是当我将手机旋转到“人像”时，它并不能覆盖整个屏幕。

我已经尝试过resizeAspectFill，但是它不起作用。 我怀疑在将屏幕旋转到新的宽高比时必须更改宽高比，但是似乎找不到成功完成此操作的示例。

有人可以帮忙吗？

示例代码如下所示：

    cameraPreviewLayer = AVCaptureVideoPreviewLayer(session: captureSession)
    cameraPreviewLayer?.videoGravity = AVLayerVideoGravity.resizeAspectFill

    let orientation: UIDeviceOrientation = UIDevice.current.orientation

    switch (orientation) {
    case .portrait:
        cameraPreviewLayer?.connection?.videoOrientation = .portrait
    case .landscapeRight:
        cameraPreviewLayer?.connection?.videoOrientation = .landscapeLeft
    case .landscapeLeft:
        cameraPreviewLayer?.connection?.videoOrientation = .landscapeRight
    case .portraitUpsideDown:
        cameraPreviewLayer?.connection?.videoOrientation = .portraitUpsideDown
    default:
        cameraPreviewLayer?.connection?.videoOrientation = .portraitUpsideDown
    }

    cameraPreviewLayer?.frame = self.view.frame

    self.view.layer.insertSublayer(cameraPreviewLayer!, at: 0)

谢谢。

Answer 1

尝试将这些代码移动到viewDidLayoutSubviews ：

override func viewDidLayoutSubviews() {
    let orientation: UIDeviceOrientation = UIDevice.current.orientation

    switch (orientation) {
    case .portrait:
        cameraPreviewLayer?.connection?.videoOrientation = .portrait
    case .landscapeRight:
        cameraPreviewLayer?.connection?.videoOrientation = .landscapeLeft
    case .landscapeLeft:
        cameraPreviewLayer?.connection?.videoOrientation = .landscapeRight
    case .portraitUpsideDown:
        cameraPreviewLayer?.connection?.videoOrientation = .portraitUpsideDown
    default:
        cameraPreviewLayer?.connection?.videoOrientation = .portraitUpsideDown
    }

    cameraPreviewLayer?.frame = self.view.frame
}