Swift UIButton扩展动画覆盖

Question

So I have a UIButton Extension that allows all the buttons in my app to have a nice subtle animation. But recently I have thought of giving a few buttons a special animation but I am not sure how to give those few buttons a specific different animation other than the one that I have set universally for all the UIButtons . Is there a way to override this animation for just a few specific buttons?

Code for the extension of the button animation universally:

extension UIButton {
   override open func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) 
   {
    self.transform = CGAffineTransform(scaleX: 0.6, y: 0.6)

    UIView.animate(withDuration: 0.5, delay: 0, usingSpringWithDamping: 0.5, initialSpringVelocity: 6, options: .allowUserInteraction, animations: {
        self.transform = CGAffineTransform.identity
    }, completion: nil)
    super.touchesBegan(touches, with: event)
  }
}

Answer 1

I think the best thing to do here is to create subclasses of UIButton s that all do different things, instead of creating extensions of UIButton . Extensions are supposed to add new functionality, not override existing methods, like touchesBegan .

You should delete your extension and write a SubtleAnimationButton :

class SubtleAnimationButton : UIButton {
   override open func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) 
   {
    self.transform = CGAffineTransform(scaleX: 0.6, y: 0.6)

    UIView.animate(withDuration: 0.5, delay: 0, usingSpringWithDamping: 0.5, initialSpringVelocity: 6, options: .allowUserInteraction, animations: {
        self.transform = CGAffineTransform.identity
    }, completion: nil)
    super.touchesBegan(touches, with: event)
  }
}

And use SubtleAnimationButton instead.

For those buttons where you want to override the behaviour, you should use a different subclass. I'll call this SpecialButton .

class SpecialButton : UIButton {
    override open func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {
        // something else
    }
}