Add target to all UIButtons' touchUpInside Event

Question

I hope that this question's answer is as simple as the question itself.

I have a sound effect in an AVAudioPlayer that I want to play when every button is pressed. Now rather than manually adding a target to play that audio file to every button in my code, is there a way where I can override the touchUpInside event method (perhaps in an extension category file) and send the call to the AVPlayer in addition to sending the call to the super?

I don't want to have to subclass if I don't have to. Is there a delegate method I can use?

Answer 1

From any class that has a reference to the view which contains the buttons as subviews, you can just iterate through all of the subviews and see which ones are UIButtons:

for (id subview in _buttonView.subviews)
    if ([subview isKindOfClass:[UIButton class]])
        [(UIButton *)subview addTarget:self 
                             selector:@selector:(playSound)    
                             forControlEvents:UIControlEventTouchUpInside];

Answer 2

In such cases, the best way is to subclass the parent view of your button view. If you are adding the buttons in a UIView class, then subclass your class from UIView. So, you will have to change only one place in the code.

Now, in the subclass override this method:

- (void)didAddSubview:(UIView *)subview;

It will get called when any of the subviews will be added to it. Identify the proper subview in the method and do any processing over the subview which you want.