Shake Animation for UITextField/UIView in Swift

Question

I am trying to figure out how to make the text Field shake on button press when the user leaves the text field blank.

I currently have the following code working:

Answer 1

You can change the duration and repeatCount and tweak it. This is what I use in my code. Varying the fromValue and toValue will vary the distance moved in the shake.

let animation = CABasicAnimation(keyPath: "position")
animation.duration = 0.07
animation.repeatCount = 4
animation.autoreverses = true
animation.fromValue = NSValue(cgPoint: CGPoint(x: viewToShake.center.x - 10, y: viewToShake.center.y))
animation.toValue = NSValue(cgPoint: CGPoint(x: viewToShake.center.x + 10, y: viewToShake.center.y))

viewToShake.layer.add(animation, forKey: "position")