How do you change UIButton image alpha on disabled state?

Question

I have a UIButton with an image and on its disabled state, this image should have .3 alpha.

UIButton *button = [UIButton buttonWithType:UIButtonTypeCustom];
UIIm         


        

Answer 1

I found that none of these solutions really work. The cleanest way of doing it is to subclass, and instead of using self.imageView, just add your own custom imageView like this:

_customImageView = [[UIImageview alloc] initWithImage:image];

Then add your custom alpha like so:

- (void)setEnabled:(BOOL)enabled {
    [super setEnabled:enabled];
    if (enabled) {
        _customImageView.alpha = 1.0f;
    } else {
        _customImageView.alpha = 0.25f;
    }
}