Question

I have a simple camera app, that has a AVCaptureVideoPreviewLayer inside a View.

I also have a button that triggers the AVCaptureSession to swap input between the rear and the front cameras.

I’d love to cause a flip animation when the change happens but I can’t work out how to do it…

I was thinking I’d try and overlay a freezeframe of the AVCaptureVideoPreviewLayer and then transition this layer swapping back with the AVCaptureVideoPreviewLayer.

Any pointers would really be gratefully received

Answer 1

If your AVCaptureVideoPreviewLayer is inside a UIView, you should probably make a transition with this UIView.

Use one of these methods:

+ (void)transitionWithView:(UIView *)view duration:(NSTimeInterval)duration options:(UIViewAnimationOptions)options animations:(void (^)(void))animations completion:(void (^)(BOOL finished))completion

+ (void)transitionFromView:(UIView *)fromView toView:(UIView *)toView duration:(NSTimeInterval)duration options:(UIViewAnimationOptions)options completion:(void (^)(BOOL finished))completion

http://developer.apple.com/library/ios/#documentation/uikit/reference/uiview_class/uiview/uiview.html

With UIViewAnimationOptions set on UIViewAnimationOptionTransitionFlipFromLeft or UIViewAnimationOptionTransitionFlipFromRight