title: Accessing a view controller created through Storyboard using the App Delegate
body: <p>I'm working on an iOS5 app using storyboard, and I have a method in a view controller class that i'd like to access from the App Delegate.  The trouble is, this view controller gets instantiated via a tab bar controller in storyboard, so the App Delegate has no direct way of calling the method I want...</p>
  
  <p>For a view controller to get in touch with the App Delegate, all one has to do is use:</p>
  
  <pre><code>MyAppDelegate *appDelegate = (MyAppDelegate *)[[UIApplication sharedApplication] delegate];
  </code></pre>
  
  <p>Is there a similarly easy way of pointing to an already-instantiated view controller or class?</p>