title: Swift custom back button in navigation bar
body: <p>I am trying to use a custom image for my back button in the navigation bar. I am using the below code, which adds the image, but also keeps the text "Back" in the button. I want to also remove the text. Can I do that?</p>
  
  <pre><code>self.navigationController?.navigationBar.backIndicatorImage = UIImage(named: "icon-back")
  self.navigationController?.navigationBar.backIndicatorTransitionMaskImage = UIImage(named: "icon-back")
  self.navigationItem.backBarButtonItem = UIBarButtonItem(title: "", style: UIBarButtonItemStyle.Plain, target: nil, action: nil)
  </code></pre>