title: How to Skip Over Previous View When Back Button Pressed
body: <p>I have the navigation as:</p>
  
  <p><code>List of Friends with messages Controller</code> (click compose) -> <code>List of friends to select chatting</code> (select friend) ->  <code>Show chat with friend</code></p>
  
  <p>At present, if within <code>Show chat with friend</code>, and the user selects <code>back</code>, it takes them to the <code>List of friends to select chatting</code> controller.
  I wish to skip over this controller and, upon back selection, navigate to <code>List of Friends with messages Controller</code></p>
  
  <p>Note: the <code>List of Friends with messages Controller</code> is an embedded within a tab.</p>
  
  <p>I have attempted using: <code>self.navigationController?.viewControllers.removeLast()</code>, within the <code>segue</code> between the  <code>List of friends to select chatting</code> to remove it from the stack. But then after the navigating to <code>Show chat with friend</code>, the back button disappears...</p>
  
  <p>How can I allow the navigation I am describing? </p>