iOS CAlayer Orientation AVCaptureVideoPreviewLayer doesn't rotate

Question

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

Answer 1

// layout iOS 8+ animated 
- (void)viewWillTransitionToSize:(CGSize)size withTransitionCoordinator:(id)coordinator
{
    [coordinator animateAlongsideTransition:^(id context)
    {
         NSString *timingFunc = nil;
         switch ( [context completionCurve] )
         {
             case UIViewAnimationCurveEaseIn:    timingFunc = kCAMediaTimingFunctionEaseIn;          break;
             case UIViewAnimationCurveEaseInOut: timingFunc = kCAMediaTimingFunctionEaseInEaseOut;   break;
             case UIViewAnimationCurveEaseOut:   timingFunc = kCAMediaTimingFunctionEaseOut;         break;
             case UIViewAnimationCurveLinear:    timingFunc = kCAMediaTimingFunctionLinear;          break;
         }

         [CATransaction begin];
         [CATransaction setAnimationDuration:[context transitionDuration]];
         [CATransaction setAnimationTimingFunction:[CAMediaTimingFunction functionWithName:timingFunc]];
         [self updatePreviewLayer];
         [CATransaction commit];

         UIInterfaceOrientation toOrientation = [[UIApplication sharedApplication] statusBarOrientation];
         // layout ui if needed

    } completion:^(id context)
    {

    }];

    [super viewWillTransitionToSize:size withTransitionCoordinator:coordinator];
}

- (void)updatePreviewLayer
{
    CGAffineTransform transform = CGAffineTransformIdentity;
    switch ( UIDevice.currentDevice.orientation )
    {
        case UIDeviceOrientationLandscapeLeft:
            transform = CGAffineTransformRotate(transform, -M_PI_2);
        break;
        case UIDeviceOrientationLandscapeRight:
            transform = CGAffineTransformRotate(transform, M_PI_2);
        break;
        case UIDeviceOrientationPortraitUpsideDown:
            transform = CGAffineTransformRotate(transform, M_PI);
        break;
        default:
        break;
    }
    preview.affineTransform = transform;
    preview.frame = self.view.bounds;
}