How do I create an animated boarder around a UIView in Swift

Question

I want a border around a UIView that can fade in-and-out. I've created a border that shows once an action is done, but it's static and doesn't look very appealing.

This is the kind of border that I'm looking for in this GIF: LINK

Help would be appreciated as I'm really trying to get this working.

Thanks,

Answer 1

let borderWidth:CABasicAnimation = CABasicAnimation(keyPath: "borderWidth")
borderWidth.fromValue = 1
borderWidth.toValue = 5
borderWidth.duration = 1
borderWidth.autoreverses = true
borderWidth.repeatDuration = 300
view.layer.borderWidth = 5
view.layer.borderColor = UIColor.red.cgColor
view.layer.add(borderWidth, forKey: "Width")
view.layer.borderWidth = 1.0