AVCaptureVideoPreviewLayer方向 - 需要景观-Java 学习之路

我的应用只是风景 . 我将这样呈现AVCaptureVideoPreviewLayer：

self.previewLayer = [[AVCaptureVideoPreviewLayer alloc] initWithSession:session];
[self.previewLayer setBackgroundColor:[[UIColor blackColor] CGColor]];
[self.previewLayer setVideoGravity:AVLayerVideoGravityResizeAspect];                    
NSLog(@"previewView: %@", self.previewView);
CALayer *rootLayer = [self.previewView layer];
[rootLayer setMasksToBounds:YES];
[self.previewLayer setFrame:[rootLayer bounds]];
    NSLog(@"previewlayer: %f, %f, %f, %f", self.previewLayer.frame.origin.x, self.previewLayer.frame.origin.y, self.previewLayer.frame.size.width, self.previewLayer.frame.size.height);
[rootLayer addSublayer:self.previewLayer];
[session startRunning];

self.previewView的框架为（0,0,568,320），这是正确的 . self.previewLayer记录一个（0,0,568,320）的帧，这在理论上是正确的 . 但是，相机显示在横向屏幕中间显示为纵向矩形，并且相机预览图像的方向错误90度 . 我究竟做错了什么？我需要在横屏模式下以全屏显示相机预览图层，并且图像应正确定向 .

17 回答

10
默认摄像机方向为横向左侧（左侧是主页按钮） . 你需要在这里做两件事：

1-将previewLayer框架更改为：
```
self.previewLayer.frame=self.view.bounds;
```
您需要将预览图层框架设置为屏幕边界，以便在屏幕旋转时预览图层的框架发生更改（您不能使用根视图的框架，因为它不会随着旋转而改变，而是根视图的边界做） . 在您的示例中，您将预览层框架设置为我看不到的previewView属性 .

2-您需要通过设备的旋转来旋转预览图层连接 . 在viewDidAppear中添加此代码：
```
-(void) viewDidAppear:(BOOL)animated
{
  [super viewDidAppear:YES];

  //Get Preview Layer connection
  AVCaptureConnection *previewLayerConnection=self.previewLayer.connection;

  if ([previewLayerConnection isVideoOrientationSupported])
    [previewLayerConnection setVideoOrientation:[[UIApplication sharedApplication] statusBarOrientation]]; 
}
```
希望这能解决它 .

完全披露：这是一个简化版本，因为您不关心Landscape Right还是Landscape .
回复于 2024-04-29T23:46:13+08:00

SWIFT 3.0和XCODE 8.0的最佳答案

private func updatePreviewLayer(layer: AVCaptureConnection, orientation: AVCaptureVideoOrientation) {

    layer.videoOrientation = orientation

    previewLayer.frame = self.view.bounds

}

override func viewDidLayoutSubviews() {
    super.viewDidLayoutSubviews()

    if let connection =  self.previewLayer?.connection  {

        let currentDevice: UIDevice = UIDevice.current

        let orientation: UIDeviceOrientation = currentDevice.orientation

        let previewLayerConnection : AVCaptureConnection = connection

        if previewLayerConnection.isVideoOrientationSupported {

            switch (orientation) {
            case .portrait: updatePreviewLayer(layer: previewLayerConnection, orientation: .portrait)

                break

            case .landscapeRight: updatePreviewLayer(layer: previewLayerConnection, orientation: .landscapeLeft)

                break

            case .landscapeLeft: updatePreviewLayer(layer: previewLayerConnection, orientation: .landscapeRight)

                break

            case .portraitUpsideDown: updatePreviewLayer(layer: previewLayerConnection, orientation: .portraitUpsideDown)

                break

            default: updatePreviewLayer(layer: previewLayerConnection, orientation: .portrait)

                break
            }
        }
    }
}

BEST ANSWER FOR SWIFT 2.2 AND XCODE 7.3

private func updatePreviewLayer(layer: AVCaptureConnection, orientation: AVCaptureVideoOrientation) {

    layer.videoOrientation = orientation

    previewLayer.frame = self.view.bounds

}

override func viewDidLayoutSubviews() {
    super.viewDidLayoutSubviews()

    if let connection =  self.previewLayer?.connection  {

        let currentDevice: UIDevice = UIDevice.currentDevice()

        let orientation: UIDeviceOrientation = currentDevice.orientation

        let previewLayerConnection : AVCaptureConnection = connection

        if (previewLayerConnection.supportsVideoOrientation) {

            switch (orientation) {
            case .Portrait: updatePreviewLayer(previewLayerConnection, orientation: .Portrait)

                break

            case .LandscapeRight: updatePreviewLayer(previewLayerConnection, orientation: .LandscapeLeft)

                break

            case .LandscapeLeft: updatePreviewLayer(previewLayerConnection, orientation: .LandscapeRight)

                break

            case .PortraitUpsideDown: updatePreviewLayer(previewLayerConnection, orientation: .PortraitUpsideDown)

                break

            default: updatePreviewLayer(previewLayerConnection, orientation: .Portrait)

                break
            }
        }
    }
}

回复于 2024-04-29T23:46:13+08:00

override func viewWillTransitionToSize(size: CGSize, withTransitionCoordinator coordinator: UIViewControllerTransitionCoordinator) {
    super.viewWillTransitionToSize(size, withTransitionCoordinator: coordinator)
    if let connection =  self.previewLayer?.connection  {
        var currentDevice: UIDevice = UIDevice.currentDevice()
        var orientation: UIDeviceOrientation = currentDevice.orientation
        var previewLayerConnection : AVCaptureConnection = connection

        if (previewLayerConnection.supportsVideoOrientation) {
            switch (orientation) {
            case .portrait:
                previewLayerConnection.videoOrientation = AVCaptureVideoOrientation.portrait
                break
            case .landscapeRight:
                previewLayerConnection.videoOrientation = AVCaptureVideoOrientation.landscapeRight
                break
            case .landscapeLeft:
                previewLayerConnection.videoOrientation = AVCaptureVideoOrientation.landscapeLeft
                break
            case .portraitUpsideDown:
                previewLayerConnection.videoOrientation = AVCaptureVideoOrientation.portraitUpsideDown
                break

            default:
                previewLayerConnection.videoOrientation = AVCaptureVideoOrientation.portrait
                break
            }
        }
    }
}

回复于 2024-04-29T23:46:13+08:00

我们不能用

[previewLayerConnection setVideoOrientation:[[UIApplication sharedApplication] statusBarOrientation]];

因为 UIInterfaceOrientation != AVCaptureVideoOrientation

但是我们可以通过以下代码测试值...并且这项工作 .

-(void)viewDidLayoutSubviews {
    [super viewDidLayoutSubviews];

    UIInterfaceOrientation orientation = [[UIApplication sharedApplication] statusBarOrientation];
    switch (orientation) {
        case UIInterfaceOrientationPortrait:
            [_videoPreviewLayer.connection setVideoOrientation:AVCaptureVideoOrientationPortrait];
            break;
        case UIInterfaceOrientationPortraitUpsideDown:
            [_videoPreviewLayer.connection setVideoOrientation:AVCaptureVideoOrientationPortraitUpsideDown];
            break;
        case UIInterfaceOrientationLandscapeLeft:
            [_videoPreviewLayer.connection setVideoOrientation:AVCaptureVideoOrientationLandscapeLeft];
            break;
        case UIInterfaceOrientationLandscapeRight:
            [_videoPreviewLayer.connection setVideoOrientation:AVCaptureVideoOrientationLandscapeRight];
            break;
    }
}

回复于 2024-04-29T23:46:13+08:00

API似乎有所改变 . videoOrientation 现在是预览图层 connection 属性的属性 . 此外，无需使用开关 . Swift 3.0的答案：

override func viewDidLayoutSubviews() {
    self.configureVideoOrientation()
}

private func configureVideoOrientation() {
    if let previewLayer = self.previewLayer,
        let connection = previewLayer.connection {
        let orientation = UIDevice.current.orientation

        if connection.isVideoOrientationSupported,
            let videoOrientation = AVCaptureVideoOrientation(rawValue: orientation.rawValue) {
            previewLayer.frame = self.view.bounds
            previewLayer.connection?.videoOrientation = videoOrientation
        }
    }
}

回复于 2024-04-29T23:46:13+08:00

对于那些正在全功能相机预览中苦苦挣扎的人 . 这是生产环境代码 . 当然，缺点是方向改变时滞后 . 如果有人有更好的解决方案来克服这个，请分享

- (void)viewDidLoad
{
    [super viewDidLoad];
    [self initCamera];
}

- (void)initCamera
{
    AVCaptureDeviceInput *captureInput = [AVCaptureDeviceInput deviceInputWithDevice:[AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo] error:nil];
    if (captureInput) {
        mSession = [[AVCaptureSession alloc] init];
        [mSession addInput:captureInput];
    }
}

- (void)didRotateFromInterfaceOrientation:(UIInterfaceOrientation)fromInterfaceOrientation
{
    [super didRotateFromInterfaceOrientation:fromInterfaceOrientation];
    if ([mSession isRunning]) {
        [mSession stopRunning];
        [mCameraLayer removeFromSuperlayer];

        [self initCamera];

        [self startCamera];
    }
}

- (void)startCamera
{
    [mSession startRunning];
    Settings::getInstance()->setClearColor(Color(0, 0, 0, 0));
    mCameraLayer = [AVCaptureVideoPreviewLayer layerWithSession: mSession];
    [self updateCameraLayer];
    [mCameraView.layer addSublayer:mCameraLayer];
}

- (void)stopCamera
{
    [mSession stopRunning];
    [mCameraLayer removeFromSuperlayer];
    Settings::getInstance()->setDefClearColor();
}

- (void)toggleCamera
{
    mSession.isRunning ? [self stopCamera] : [self startCamera];
    [mGLKView setNeedsDisplay];
}

- (void)updateCameraLayer
{
    mCameraLayer.videoGravity = AVLayerVideoGravityResizeAspectFill;
    mCameraLayer.frame = mCameraView.bounds;
    float x = mCameraView.frame.origin.x;
    float y = mCameraView.frame.origin.y;
    float w = mCameraView.frame.size.width;
    float h = mCameraView.frame.size.height;
    CATransform3D transform = CATransform3DIdentity;
    if (UIDeviceOrientationLandscapeLeft == [[UIDevice currentDevice] orientation]) {
        mCameraLayer.frame = CGRectMake(x, y, h, w);
        transform = CATransform3DTranslate(transform, (w - h) / 2, (h - w) / 2, 0);
        transform = CATransform3DRotate(transform, -M_PI/2, 0, 0, 1);
    } else if (UIDeviceOrientationLandscapeRight == [[UIDevice currentDevice] orientation]) {
        mCameraLayer.frame = CGRectMake(x, y, h, w);
        transform = CATransform3DTranslate(transform, (w - h) / 2, (h - w) / 2, 0);
        transform = CATransform3DRotate(transform, M_PI/2, 0, 0, 1);
    } else if (UIDeviceOrientationPortraitUpsideDown == [[UIDevice currentDevice] orientation]) {
        mCameraLayer.frame = mCameraView.bounds;
        transform = CATransform3DMakeRotation(M_PI, 0, 0, 1);
    } else {
        mCameraLayer.frame = mCameraView.bounds;
    }
    mCameraLayer.transform  = transform;
}

    enter code here

回复于 2024-04-29T23:46:13+08:00

由于使用上述解决方案存在弃用和转换警告，并且设置videoOrientation似乎在iOS7中不起作用，因此我在AVCaptureVideoPreviewLayer的getter中检查了方向，如下所示：

- (AVCaptureVideoPreviewLayer *) previewLayer
{
    if(!_previewLayer)
    {
        _previewLayer = [[AVCaptureVideoPreviewLayer alloc] initWithSession: self.captureSession];

    [_previewLayer setVideoGravity:AVLayerVideoGravityResizeAspectFill];

    _previewLayer.frame = self.view.bounds; // Assume you want the preview layer to fill the view.

    [_previewLayer setPosition:CGPointMake(0,0)];

    if (UIDeviceOrientationLandscapeLeft == [[UIDevice currentDevice] orientation]) {
        _previewLayer.transform = CATransform3DMakeRotation(-M_PI/2, 0, 0, 1);
    }
    else if (UIDeviceOrientationLandscapeRight == [[UIDevice currentDevice] orientation])
    {
        _previewLayer.transform = CATransform3DMakeRotation(M_PI/2, 0, 0, 1);
    }
}

return _previewLayer;
}

回复于 2024-04-29T23:46:13+08:00

适用于Swift 4，Xcode 9：

override func viewWillTransition(to size: CGSize,
                                   with coordinator: UIViewControllerTransitionCoordinator)
  {
    super.viewWillTransition(to: size, with: coordinator)
    guard
    let conn = self.previewLayer?.connection,
      conn.isVideoOrientationSupported
      else { return }
    let deviceOrientation = UIDevice.current.orientation
    switch deviceOrientation {
    case .portrait: conn.videoOrientation = .portrait
    case .landscapeRight: conn.videoOrientation = .landscapeLeft
    case .landscapeLeft: conn.videoOrientation = .landscapeRight
    case .portraitUpsideDown: conn.videoOrientation = .portraitUpsideDown
    default: conn.videoOrientation = .portrait
    }
  }

这里要注意的一个微妙之处是 UIDeviceOrientation.landscapeRight 与 AVCaptureVideoOrientation.landscapeLeft 一起使用 .

另一个景观案例同样不匹配 . 这是故意的，并且容纳了UIKit和AVFoundation之间不幸的不匹配 . 如果您通过匹配名称来匹配案例，则它将无效，并且您的视频将在横向配置中颠倒 .

回复于 2024-04-29T23:46:13+08:00

嘿伙计们感谢所有的答案和反馈，我遇到了这个，因为我正在开发一个快速的应用程序 . 您可以使用以下代码将相机与设备一起旋转：

override func shouldAutorotate() -> Bool {
        if your cameraController.previewLayer.connection != nil {
            var currentDevice: UIDevice = UIDevice.currentDevice()
            var orientation: UIDeviceOrientation = currentDevice.orientation

            var previewLayerConnection : AVCaptureConnection = your cameraController.previewLayer.connection

            if (previewLayerConnection.supportsVideoOrientation)
            {
                switch (orientation)
                {
                case .Portrait:
                    previewLayerConnection.videoOrientation = AVCaptureVideoOrientation.Portrait
                    break
                case .LandscapeRight:
                    previewLayerConnection.videoOrientation = AVCaptureVideoOrientation.LandscapeLeft
                    break
                case .LandscapeLeft:
                    previewLayerConnection.videoOrientation = AVCaptureVideoOrientation.LandscapeRight
                    break
                default:
                    previewLayerConnection.videoOrientation = AVCaptureVideoOrientation.Portrait
                    break
                }
            }

        }
        return true
    }

希望这可以帮助！

回复于 2024-04-29T23:46:13+08:00

从 UIDeviceOrientation 到 AVCaptureVideoOrientation 的正确映射是必要的 .

如果您的应用支持 device rotation ，则还需要 resizing preview.frame ，并且应从 viewDidLayoutSubviews() 和 viewWillTransition() 调用此 func .

private func configureVideoOrientation() {
    if let preview = self.previewLayer,
        let connection = preview.connection {
        let orientation = UIDevice.current.orientation

        if connection.isVideoOrientationSupported {
            var videoOrientation: AVCaptureVideoOrientation
            switch orientation {
            case .portrait:
                videoOrientation = .portrait
            case .portraitUpsideDown:
                videoOrientation = .portraitUpsideDown
            case .landscapeLeft:
                videoOrientation = .landscapeRight
            case .landscapeRight:
                videoOrientation = .landscapeLeft
            default:
                videoOrientation = .portrait
            }
            preview.frame = self.view.bounds
            connection.videoOrientation = videoOrientation
        }
    }
}

回复于 2024-04-29T23:46:13+08:00

首先，我们需要创建AVCaptureVideoPreviewLayer并：

设置了它的videoGravity（在我的情况下，我使用一个小视图来获取视频输出） .
设置框架 .

[_videoPreviewLayer setVideoGravity:AVLayerVideoGravityResizeAspectFill];
[_videoPreviewLayer setFrame:_viewPreview.layer.bounds];

最初设置方向

if (_videoPreviewLayer.connection.supportsVideoOrientation) {
        _videoPreviewLayer.connection.videoOrientation = [self interfaceOrientationToVideoOrientation:[UIApplication sharedApplication].statusBarOrientation];
    }

使用简单的开关盒设置每种情况的方向

-(AVCaptureVideoOrientation)interfaceOrientationToVideoOrientation: 

 (UIInterfaceOrientation)orientation {

    switch (orientation) {
        case UIInterfaceOrientationPortrait:
            return AVCaptureVideoOrientationPortrait;
        case UIInterfaceOrientationPortraitUpsideDown:
            return AVCaptureVideoOrientationPortraitUpsideDown;
        case UIInterfaceOrientationLandscapeLeft:
            return AVCaptureVideoOrientationLandscapeLeft ;
        case UIInterfaceOrientationLandscapeRight:
            return AVCaptureVideoOrientationLandscapeRight;
        default:
            break;
    }
    NSLog(@"Warning - Didn't recognise interface orientation (%d)",orientation);
    return AVCaptureVideoOrientationPortrait;
 

 }

由于设备支持landscapeLeft和landscapeRight，因此使用旋转时调用的委托：

- (void)willRotateToInterfaceOrientation:(UIInterfaceOrientation)toInterfaceOrientation duration:(NSTimeInterval)duration{
if (_videoPreviewLayer.connection.supportsVideoOrientation) {
    _videoPreviewLayer.connection.videoOrientation = [self interfaceOrientationToVideoOrientation:toInterfaceOrientation];
 }
}

回复于 2024-04-29T23:46:13+08:00

我也是面对同样的这是为了修复我的相机方向

override func shouldAutorotate() -> Bool {
        return false
    }

override func preferredInterfaceOrientationForPresentation() -> UIInterfaceOrientation {
        return UIInterfaceOrientation.LandscapeLeft
    }

override func supportedInterfaceOrientations() -> UIInterfaceOrientationMask {
        return UIInterfaceOrientationMask.LandscapeLeft
    }

修理相机

let previewLayer: AVCaptureVideoPreviewLayer = AVCaptureVideoPreviewLayer(session: self.avCaptureSession)    
previewLayer.frame = self.view.layer.frame
previewLayer.videoGravity = AVLayerVideoGravityResizeAspectFill

回复于 2024-04-29T23:46:13+08:00

Maselko's answer几乎为我工作，除了状态栏方向翻转然后相机输出显示颠倒 . 当状态栏翻转时，我've addressed that issue by re-calling Maselko'的逻辑 .

这是我修改过的Maselko解决方案（在ios12 / swift4上测试）：

override func viewDidLayoutSubviews() {
    super.viewDidLayoutSubviews()
    setCameraOrientation()
}

override func viewWillTransition(to size: CGSize, with coordinator: UIViewControllerTransitionCoordinator) {
    super.viewWillTransition(to: size, with: coordinator)
    setCameraOrientation()
}

@objc func setCameraOrientation() {
    if let connection =  self.previewLayer?.connection  {
        let currentDevice: UIDevice = UIDevice.current
        let orientation: UIDeviceOrientation = currentDevice.orientation
        let previewLayerConnection : AVCaptureConnection = connection
        if previewLayerConnection.isVideoOrientationSupported {
            let o: AVCaptureVideoOrientation
            switch (orientation) {
            case .portrait: o = .portrait
            case .landscapeRight: o = .landscapeLeft
            case .landscapeLeft: o = .landscapeRight
            case .portraitUpsideDown: o = .portraitUpsideDown
            default: o = .portrait
            }

            previewLayerConnection.videoOrientation = o
            previewLayer!.frame = self.view.bounds
        }
    }
}

回复于 2024-04-29T23:46:13+08:00

选择的答案适用于Swift 4.2 - Xcode 10.0 - iOS 12.0：

var videoPreviewLayer: AVCaptureVideoPreviewLayer?

override func viewDidLayoutSubviews() {
  super.viewDidLayoutSubviews()
  if let previewLayerConnection =  self.videoPreviewLayer?.connection, previewLayerConnection.isVideoOrientationSupported {
    updatePreviewLayer(layer: previewLayerConnection, orientation: UIApplication.shared.statusBarOrientation.videoOrientation)
  }
}

private func updatePreviewLayer(layer: AVCaptureConnection, orientation: AVCaptureVideoOrientation) {
  layer.videoOrientation = orientation
  videoPreviewLayer?.frame = self.view.bounds
}

不要忘记从UIInterfaceOrientation到AVCaptureVideoOrientation的映射

extension UIInterfaceOrientation {

  public var videoOrientation: AVCaptureVideoOrientation {
    switch self {
    case .portrait:
      return AVCaptureVideoOrientation.portrait
    case .landscapeRight:
      return AVCaptureVideoOrientation.landscapeRight
    case .landscapeLeft:
      return AVCaptureVideoOrientation.landscapeLeft
    case .portraitUpsideDown:
      return AVCaptureVideoOrientation.portraitUpsideDown
    default:
      return AVCaptureVideoOrientation.portrait
    }
  }

}

回复于 2024-04-29T23:46:13+08:00

它在iOS 8到11.1中对我没有任何问题的唯一方法是这样做，我应该提一下，在我的情况下，我只在横向模式下加载我的应用程序，但它应该在所有方向上工作 . （顺便说一句，你可以叠加通过imageview手动摄像头或任何你想要的方式容易）

@interface ViewController (){
    AVCaptureVideoPreviewLayer * previewLayer;
    AVCaptureSession* session;
}
@property (weak, nonatomic) IBOutlet UIView *cameraPreviewView;


-(void)viewDidLoad{
    AVCaptureDeviceInput *captureInput = [AVCaptureDeviceInput deviceInputWithDevice:[AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo] error:nil];
    if (captureInput) {
        session = [[AVCaptureSession alloc] init];
        [session addInput:captureInput];
    }
    previewLayer = [[AVCaptureVideoPreviewLayer alloc] initWithSession:session];
    [previewLayer setBackgroundColor:[[UIColor blackColor] CGColor]];
    [previewLayer setVideoGravity:AVLayerVideoGravityResizeAspect];

    CALayer *rootLayer = [self.cameraPreviewView layer];
    [rootLayer setMasksToBounds:YES];
    [previewLayer setFrame:[self.view bounds]];
    [rootLayer addSublayer:previewLayer];
    [session startRunning];

    //Orientation Code is in viewDidLayoutSubviews method
}
-(void)viewDidLayoutSubviews {
    [super viewDidLayoutSubviews];

    UIInterfaceOrientation orientation = [[UIApplication sharedApplication] statusBarOrientation];
    switch (orientation) {
        case UIInterfaceOrientationPortrait:
            [previewLayer.connection setVideoOrientation:AVCaptureVideoOrientationPortrait];
            break;
        case UIInterfaceOrientationPortraitUpsideDown:
            [previewLayer.connection setVideoOrientation:AVCaptureVideoOrientationPortraitUpsideDown];
            break;
        case UIInterfaceOrientationLandscapeLeft:
            [previewLayer.connection setVideoOrientation:AVCaptureVideoOrientationLandscapeLeft];
            break;
        case UIInterfaceOrientationLandscapeRight:
            [previewLayer.connection setVideoOrientation:AVCaptureVideoOrientationLandscapeRight];
            break;
        default:break;
    }
}

回复于 2024-04-29T23:46:13+08:00

@Maselko的回答是正确的，但有一点：您应该使用 UIApplication.shared.statusBarOrientation 而不是 UIDevice.current.orientation ，因为设备方向是您的设备定位的方式 . 当您的设备处于横向状态但您的UI不支持该方向时（例如，当我制作仅限风景的相机应用并在设备处于纵向位置时启动视图），它会中断 .

private func updatePreviewLayer(layer: AVCaptureConnection, orientation: AVCaptureVideoOrientation) {

    layer.videoOrientation = orientation

    previewLayer.frame = self.view.bounds

}

override func viewDidLayoutSubviews() {
    super.viewDidLayoutSubviews()

    if let connection =  self.previewLayer?.connection  {

        let currentDevice: UIDevice = UIDevice.current

        let orientation = UIApplication.shared.statusBarOrientation

        let previewLayerConnection : AVCaptureConnection = connection

        if previewLayerConnection.isVideoOrientationSupported {

            switch (orientation) {
            case .portrait: updatePreviewLayer(layer: previewLayerConnection, orientation: .portrait)

                break

            case .landscapeRight: updatePreviewLayer(layer: previewLayerConnection, orientation: .landscapeLeft)

                break

            case .landscapeLeft: updatePreviewLayer(layer: previewLayerConnection, orientation: .landscapeRight)

                break

            case .portraitUpsideDown: updatePreviewLayer(layer: previewLayerConnection, orientation: .portraitUpsideDown)

                break

            default: updatePreviewLayer(layer: previewLayerConnection, orientation: .portrait)

                break
            }
        }
    }
}

回复于 2024-04-29T23:46:13+08:00

这是我使用Swift 4的解决方案 .

它很短，对我来说很漂亮 .

open override func viewWillTransition(to size: CGSize, with coordinator: UIViewControllerTransitionCoordinator) {
    super.viewWillTransition(to: size, with: coordinator)

    let videoLayer = self.previewLayer
    coordinator.animate(alongsideTransition: { (context: UIViewControllerTransitionCoordinatorContext) in

        guard let connection = videoLayer?.connection, connection.isVideoOrientationSupported, let orientation = AVCaptureVideoOrientation(rawValue: UIApplication.shared.statusBarOrientation.rawValue) else {
            return
        }

        connection.videoOrientation = orientation
        videoLayer?.frame = self.view.bounds

    }) { (context: UIViewControllerTransitionCoordinatorContext) in
        // handle any completion logic here...
    }
}

回复于 2024-04-29T23:46:13+08:00

AVCaptureVideoPreviewLayer方向 - 需要景观

17 回答

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