title: How hide back bar button in navigation controller with swift
body: <p>in the Storyboard (Xcode 6, iOS 8 and swift) i have embedded a TableViewController in a Navigation Controller.</p>
  
  <p>From the object library, i have drag &amp; drop a Bar Button Item as the back button and it show an icon image: when i click that button i show a setting view.</p>
  
  <p>How can i hide that button? In the viewDidLoad() i've tried:</p>
  
  <pre><code>self.navigationItem.hidesBackButton = true;
  </code></pre>
  
  <p>The code is executed (i've tried with the debugger) but the button is always visible.</p>