SWIFT - CALayer between PNG and background image

Question

I have seen many stackoverflow posts or tutorials on how make a mask with an image and a rectangle or a circle, but it is possible to make a mask between a png file with transparency and a background image.

In the photoshop screenshot I use the wolf png image as a mask for the background.

Any approach for this with CALayer or other in SWIFT ?

Thank you very much.

Answer 1

UIView as of iOS 8 has a mask property which you can set to any view with an alpha channel, including a UIImageView that has your image in it.

This is just a wrapper arround CALayer's mask property which works similarly. Set your image to the content property of your masking layer and set the masking layer as the mask for your background image layer.