Animate UIButton state change

Question

I\'m using a UIButton with images for normal and highlighted states. They work as expected but I want to have some fading/merging transition and not just a sudden swap.

Answer 1

Here is a self contained solution that also supports a boolean animated flag.

- (void)setEnabled:(BOOL)enabled animated:(BOOL)animated
{
  if (_button.enabled == enabled) {
    return;
  }

  void (^transitionBlock)(void) = ^void(void) {
    _button.enabled = enabled;
  };

  if (animated) {
    [UIView transitionWithView:_button
                      duration:0.15
                       options:UIViewAnimationOptionTransitionCrossDissolve
                    animations:^{
                      transitionBlock();
                    }
                    completion:nil];
  } else {
    transitionBlock();
  }
}