title: How do you define a subclass of UITabBarController?
body: <p>We were having issues with our app not rotating but that problem has been solved. We now need to force our views into protrait mode.</p>
  
  <p>The best scenario would be to define a subclass of our UITabBarController and then override supportedInterfaceOrientations with a portrait mask.</p>
  
  <p>I can't seem to figure out how to properly subclass our UITabBarController. Can someone help?</p>