title: navigationItem.setHidesBackButton hides the arrow, but the word "Back" remains
body: <p>I need to hide "&lt; Back" button in the navigator controller, but for some reason</p>
  
  <pre><code>self.navigationItem.setHidesBackButton = true
  </code></pre>
  
  <p>only hides the arrow, the word "Back" remains:</p>
  
  <p><img src="https://i.imgur.com/AdhEc6y.png" alt=""></p>
  
  <p>What's the best way to hide navigation back button in iOS8?</p>
  
  <p>Thank you</p>