Touchable area of a UIButton

Question

Is there any way to define which area of a UIButton is clickable? In my case I would like to have PNGs with an alpha channel overlapping. These PNGs should act as buttons - but only where alpha is > 0. Is there a way?

Best Stefan

Answer 1

Don't do that. According to the Apple Human Interface Guidelines, all UI elements should behave in a consistent manner.

Answer 2

Check this out: Irregularly Shaped UIButtons