title: dismissViewControllerAnimated completion method not working
body: <p>Here's my app design. I have <code>mainController</code> which presents <code>secondViewController</code>. Now, I want to dismiss <code>secondViewController</code> and subsequently call the method <code>aMethod</code> on <code>mainController</code> like so:</p>
  
  <pre><code>[self dismissViewControllerAnimated:YES completion:aMethod];
  </code></pre>
  
  <p>But this gives me the error <code>use of undeclared identifier 'aMethod'</code></p>
  
  <p>Obviously I am not using the completion handler correctly, but I cannot figure out the correct way. </p>