iOS: Non-square hit areas for buttons

Question

I need to make some triangular buttons that overlap each other.

While UIButtons can take transparent images as backgrounds, and UIControls can have custom views, the

Answer 1

You can achieve this by subclassing UIButton and providing your own:

- (BOOL)pointInside:(CGPoint)point withEvent:(UIEvent *)event {
    // return YES if point is inside the receiver’s bounds; otherwise, NO.
}

Apple's UIView Documentation provides the details, such as confirming that point is already in the receiver's coordinate system.