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

with UIViewPropertyAnimator and Swift 5

UIViewPropertyAnimator.runningPropertyAnimator(withDuration: 1, delay: 0, options: [.curveLinear,.repeat], animations: {
       UIView.setAnimationRepeatCount(3000)
       self.buttonScan.alpha = 0.0
 }, completion: {_ in   })