How to expand the hitTest area of a UIButton without extruding it's background image?

Question

I have set the UIButton's background image and put a title on it(I used setBackgroundImage method not setImage). Now I want to expand the hitTest area of a UIButton without extrude it's background image.

How can I do this?

Answer 1

A cleaner way to do this is to override pointInside.

Here's a Swift version:

override func pointInside(point: CGPoint, withEvent event: UIEvent?) -> Bool {
    let expandedBounds = CGRectInset(self.bounds, -15, -15)
    return CGRectContainsPoint(expandedBounds, point)
}

Answer 2

Here's a corrected version of the accepted answer. We're using bounds instead of frame and CGRectInset instead of CGRectMake. Cleaner and more reliable.

- (UIView *)hitTest:(CGPoint)point withEvent:(UIEvent *)event {
    return CGRectContainsPoint([self expandedBounds], point) ? self : nil;
}

- (CGRect)expandedBounds {
    return CGRectInset(self.bounds, -20, -20);
}