iOS CAlayer Orientation AVCaptureVideoPreviewLayer doesn't rotate

Question

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

Answer 1

- (void)willRotateToInterfaceOrientation:(UIInterfaceOrientation)toInterfaceOrientation duration:(NSTimeInterval)duration  
{  
    previewLayer.orientation = toInterfaceOrientation;  
}

Answer 2

I am still not sure what's causing the problem but I managed to fix it. Here is how I did it:

in viewDidLoad I am adding a layer:

CGRect layerRect = [[[self view] layer] bounds];
    [[[self captureManager] previewLayer] setBounds:layerRect];
    [[[self captureManager] previewLayer] setPosition:CGPointMake(CGRectGetMidX(layerRect),CGRectGetMidY(layerRect))];
    [[[self view] layer] addSublayer:[[self captureManager] previewLayer]];

Then I am adding call to the rotateLayer method to didRotate

- (void)didRotateFromInterfaceOrientation:(UIInterfaceOrientation)fromInterfaceOrientation{
    [self rotateLayer];
}

and finally the rotateLayer method looks like:

-(void)rotateLayer{
    CALayer * stuckview = [[self captureManager] previewLayer];
    CGRect layerRect = [[[self view] layer] bounds];

    UIDeviceOrientation orientation =[[UIDevice currentDevice]orientation];

    switch (orientation) {
        case UIDeviceOrientationLandscapeLeft:
            stuckview.affineTransform = CGAffineTransformMakeRotation(M_PI+ M_PI_2); // 270 degress

            break;
        case UIDeviceOrientationLandscapeRight:
            stuckview.affineTransform = CGAffineTransformMakeRotation(M_PI_2); // 90 degrees
            break;
        case UIDeviceOrientationPortraitUpsideDown:
            stuckview.affineTransform = CGAffineTransformMakeRotation(M_PI); // 180 degrees
            break;
        default:
            stuckview.affineTransform = CGAffineTransformMakeRotation(0.0);
            [stuckview setBounds:layerRect];
            break;
    }
    [stuckview setPosition:CGPointMake(CGRectGetMidX(layerRect),CGRectGetMidY(layerRect))];
}

I still don't understand why it works in this way. If anyone can explain it will be great.