iOS CAlayer Orientation AVCaptureVideoPreviewLayer doesn't rotate

Question

Summary: I can\'t force the CALayer to respond correctly to orientati

Answer 1

This the method I use in the view controller to maintain the orientation of the capture layer so that it is always right-side-up:

- (void)willRotateToInterfaceOrientation:(UIInterfaceOrientation)toInterfaceOrientation duration:(NSTimeInterval)duration
    if (_previewLayer.connection.supportsVideoOrientation)
    {
    switch (toInterfaceOrientation)
        {
        case UIInterfaceOrientationPortrait:
            {
            _previewLayer.connection.videoOrientation = AVCaptureVideoOrientationPortrait;
            break;
            }
        case UIInterfaceOrientationPortraitUpsideDown:
            {
            _previewLayer.connection.videoOrientation = AVCaptureVideoOrientationPortraitUpsideDown;
            break;
            }
        case UIInterfaceOrientationLandscapeLeft:
            {
            _previewLayer.connection.videoOrientation = AVCaptureVideoOrientationLandscapeLeft;
            break;
            }
        case UIInterfaceOrientationLandscapeRight:
            {
            _previewLayer.connection.videoOrientation = AVCaptureVideoOrientationLandscapeRight;
            break;
            }
        }
    }

A little wordy, but safe even if either enumeration ever changes in the future.