title: Animate a UIButton
body: <p>I wanted to know if is possible to have a UIButton which when untouched animates?</p>
  
  <p>Not sure if that makes perfect sense.  I have a UIButton which I have placed via IB on my XIB.  I am using a type Custom with my own 75x75 image for control state default.  When the user touches the button i have no custom image set so it just darkens which is fine.</p>
  
  <p>However, when the button is not touched, I would like it to animate between two or three different custom images to give it an effect of 'glowing' around the outer edges.  Is this possible to do?</p>