title: Setting custom back button to look like default back button
body: <p>I am trying to make a custom back button but also want to retain the default look of the back button. I simply want the look of the default back arrow (&lt;) without any text. The code I am using is</p>
  
  <pre><code>    let newBackButton = UIBarButtonItem(title: "&lt;", style: UIBarButtonItemStyle.Plain, target: self, action: "goBack")
      navigationItem.leftBarButtonItem = newBackButton
  </code></pre>
  
  <p>But this makes the back button looks all wrong. I can't find anywhere how/what to change the button to look like the default look. Thanks for any help.</p>