title: Adding a Flip View type controller in the middle of a UINavigationController hierarchy
body: <p>I currently have a UINavigationController based application that works just fine. I'd like to take one of the view controllers that's a few levels deep into the UINavigationController stack to have a "flip side" type view as demonstrated by Utility apps, etc. Very common thing.</p>
  
  <p>The problem here is that I created an intermediate view controller to manage both the view controllers that will be flipping back and forth. Now the intermediate view controller intercepts and overrides the navigationBar with its own within the hierarchy. The navigationBar from the existing view controller gets masked and its entire view gets shifted down. </p>
  
  <p>I've tried doing something like:</p>
  
  <pre><code>myFlipViewController.view = myOriginalViewController.view;
  </code></pre>
  
  <p>That breaks my entire view from myOriginalViewController as it has its own navigationItems. I basically just want myFlipViewController to act as a transparent proxy that will control flipping myOriginalViewController and othersideViewController. The navigationItems from myOriginalViewController should still show up.</p>
  
  <p>I've tried an assortment of setNavigationBarHidden amongst the view controllers, but nothing seems to be doing the trick.</p>
  
  <p>What's the best way to introduce a flipViewController in the middle of a UINavigationController stack without making it get in the way?</p>