How to make a button flash or blink?

Question

I am trying to change a button\'s color (just a flash/blink) to green when a scan is correct and red when there\'s a problem. I am able to do this with a view like so

Answer 1

myButton.alpha = 0.7

UIView.animate(withDuration: 0.3,
                      delay: 1.0,
                    options: [UIView.AnimationOptions.curveLinear, UIView.AnimationOptions.repeat, UIView.AnimationOptions.autoreverse],
                 animations: { myButton.alpha = 1.0 },
                 completion: nil)