ios - UIInterfaceOrientation 是 Landscape 但 UIView 仍处于 Portrait 模式

Question

我正在使用最新的 SDK 开发一个 iOS 应用程序。

我正在开发一个仅支持 LandscapeRight 方向的相机应用程序。

主线 ViewController我添加了一个 UIView对于 AVCaptureVideoPreviewLayer .换句话说，主要 ViewController我有主视图和另一个 View ，称为 videoPreviewView , 对于 AVCaptureVideoPreviewLayer .

我设置了AVCaptureVideoPreviewLayer在 viewWillAppear:方法:

- (void) viewWillAppear:(BOOL)animated
{
    [super viewWillAppear:animated];
    [self setUpVideo];
}

- (void)setUpVideo
{
    NSLog(@"Set up video");
    if (DataExchanger.cameraManager != nil)
    {
        UIView *view = [self videoPreviewView];
        CALayer *viewLayer = [view layer];
        [viewLayer setMasksToBounds:YES];

        AVCaptureVideoPreviewLayer *newCaptureVideoPreviewLayer = [[AVCaptureVideoPreviewLayer alloc] initWithSession:DataExchanger.cameraManager.captureSession];
        CGRect bounds = [view bounds];
        NSLog(@"BOUNDS: %@", NSStringFromCGRect(bounds));

        [newCaptureVideoPreviewLayer setFrame:bounds];
        [newCaptureVideoPreviewLayer setVideoGravity:AVLayerVideoGravityResizeAspectFill];

        [viewLayer insertSublayer:newCaptureVideoPreviewLayer below:[[viewLayer sublayers] objectAtIndex:0]];
    }
}

我得到这个日志:

BOUNDS: {{0, 0}, {320, 480}}

但是 UIInterfaceOrientation是 UIInterfaceOrientationLandscapeRight有了这个方向，我会得到这些值:

BOUNDS: {{0, 0}, {480, 320}}

另一个问题是我看到 视频旋转 -90 度 .

我找到了这个 stackoverflow question , 但是 - (void)didRotateFromInterfaceOrientation:(UIInterfaceOrientation)fromInterfaceOrientation方法永远不会被触发。

发生了什么？我该如何解决这个问题？

Answer 1

默认的 AVCaptureVideoPreviewLayer 对象方向是横向的!

AVCaptureVideoPreviewLayer 的方向不会随着设备的方向而改变。您必须手动更改它。

手动更改需要调用预览层的连接并旋转:

iOS6:

 AVCaptureConnection *previewLayerConnection=self.newCaptureVideoPreviewLayer.connection;
 if ([previewLayerConnection isVideoOrientationSupported])
   [previewLayerConnection setVideoOrientation:AVCaptureVideoOrientationLandscapeRight];

< iOS6:

if ([self.newCaptureVideoPreviewLayer isOrientationSupported])   
[self.newCaptureVideoPreviewLayer setOrientation:AVCaptureVideoOrientationLandscapeRight];