title: User Interaction on a UIImageView
body: <p>I have a number of UIImageView which have buttons on top of them.</p>
  
  <p>I would like to enable user interaction on the UIImageView behind these buttons.</p>
  
  <p>I see the option in IB, but would like to know how to trigger some code when the UIImageView is actually touched.</p>
  
  <p>How does one do this and how is it set to enabled and disabled in the code rather than IB?</p>
  
  <p>Thanks</p>