Question

When a user touches down on my UIButton subclass, I want the the button to expand in size outward. However, when I manipulate the button’s frame in the touchDown event nothing happens. The touchDown event is being called and I can change other properties such as color, but not the frame.

What is going on here?

- (id)initWithFrame:(CGRect)frame {    
    self = [super initWithFrame:frame];

    if (self) {        
        [self addTarget:self action:@selector(touchDown:) forControlEvents:UIControlEventTouchDown];
    }  

    return self;
}

- (void)touchDown:(id)sender {
    self.frame = CGRectInset(self.frame, -20, -20);
}

EDIT: The button is nested deep within a view hierarchy, but each superview has clipsToBounds = NO.

Answer 1

The problem was that my superview implements layoutSubviews and resets my subview frames each time I update their frame.