What's the difference between UIView.animate() and UIButton.animate()?-CodePudding

I want to change the opacity of my button to half when pressed, and animate that change. So I was searching for how to do that and found this piece of code:

    @IBAction func keyPressed(_ sender: UIButton) {
        UIView.animate(withDuration: 0.3)
        {
            sender.alpha = 0.5
        }

I got curious as to why we called the animate function on a UIView not on a UIButton, as what we want to animate is, specifically, a UIButton. So I tried UIButton.animate() and to my eyes it gives the same result with the animation.

So what's the difference? Is there a reason the person posting this code preferred using UIView.animate() over UIButton.animate()?

CodePudding user response：

The animate function is a class level function of UIView so it is common to use it as UIView.animate....

Since UIButton ultimately extends UIView, using UIButton.animate... also works. You could even use UIScrollView.animate..., for example, in your UIButton code. Obviously that would be confusing but it would work.

In any code within a UIView subclass, using Self.animate... also works.

But the basic answer to your question is that people use UIView.animate... because animate is defined in the UIView class.