title: Perform Action when UIButton State changes
body: <p>I have a UIButton that performs an Action when it is touched down. 
  I do this with</p>
  
  <pre><code>[inButton addTarget:self action:@selector(cardTouchDown) forControlEvents:UIControlEventTouchDown];
  </code></pre>
  
  <p>Now I want to perform another action when the button leaves this state. Any advices how to do this?</p>