title: Trouble hiding backbarbutton text
body: <p>For some reason this code won't hide back button text. </p>
  
  <pre><code>self.navigationItem.backBarButtonItem = UIBarButtonItem(title: " ", style: .Plain, target: nil, action: nil)}
  </code></pre>
  
  <p>Text remains "Back".</p>
  
  <p>On the other hand executing:</p>
  
  <pre><code>self.navigationItem.hidesBackButton
  </code></pre>
  
  <p>does hide the button. I execute both inside viewDidLoad. Any ideas how to remove that text and keep the arrow only? I read the suggestions on this site already.</p>