This demo app shows how to apply spring style animation on a button.

Animation is done by setting Scale transform to the button inside animation block. This demo app allows to tweak duration, damping and velocity parameters of the animation function.

button.transform = CGAffineTransformMakeScale(0.1, 0.1)

UIView.animateWithDuration(2.0,
  delay: 0,
  usingSpringWithDamping: 0.20,
  initialSpringVelocity: 6.00,
  options: UIViewAnimationOptions.AllowUserInteraction,
  animations: {
    self.button.transform = CGAffineTransformIdentity
  }, completion: nil)

The Large Bubble Sound clip is taken from soundbible.com and recorded by snottyboy.