title: UIBarButtonItem appearance and setBackButtonBackgroundImage
body: <p>I change my back button when pushing a new viewcontroller in my navigationcontroller. But it doesnt look nice and its stretched. Also, how can I remove the "News" title in my back button?
  here's my code. see the image </p>
  
  <p><img src="https://i.stack.imgur.com/BB1me.png" alt="screen shoot"></p>
  
  <p>and the code is </p>
  
  <pre><code>[[UIBarButtonItem appearance] setBackButtonBackgroundImage:[UIImage imageNamed:@"back_button.png"] forState:UIControlStateNormal barMetrics:UIBarMetricsDefault];
  </code></pre>
  
  <p>I want to achieve something like this <a href="http://i228.photobucket.com/albums/ee262/romano2717/photo4.png" rel="nofollow noreferrer">http://i228.photobucket.com/albums/ee262/romano2717/photo4.png</a></p>