title: UIAlertView easy way to tell if cancel button is selected
body: <p>I know I've done this before but I just can't figure it out again.</p>
  
  <p>What is the method I would use to see if a cancel button was pressed. I don't want to do it based on the button index. There is a way to do it, something like:</p>
  
  <pre><code>[alertView isCancelIndex:index];
  </code></pre>
  
  <p>Anyone know?</p>