title: How to access the stack in UINavigationController
body: <blockquote>
    <h2><strong>viewControllers</strong></h2>
    
    <p>The view controllers currently on the
    navigation stack.</p>
  
  <pre><code>@property(nonatomic, copy) NSArray * viewControllers
  </code></pre>
    
    <p><strong>Discussion</strong></p>
    
    <p>The root view controller is at index 0 in the
    array, the back view controller is at
    index n-2, and the top controller is
    at index n-1, where n is the number of
    items in the array.</p>
    
    <p>Assigning a new array of view
    controllers to this property is
    equivalent to calling the
    setViewControllers:animated: method
    with the animated parameter set to NO.</p>
  </blockquote>
  
  <p>I am confused how to access the the stack I have three views in the navigation controller – root view controller, sti testing location, sti map.</p>
  
  <p>How can I access the stack?</p>