title: Remove back arrow in iOS7
body: <p><img src="https://i.stack.imgur.com/uadjY.png" alt="enter image description here"></p>
  
  <p>I want to incorporate a custom back button - I'm able to get the above result using</p>
  
  <pre><code>self.navigationItem.backBarButtonItem = [[UIBarButtonItem alloc] initWithImage:[UIImage imageNamed:@"back-btn"] style:UIBarButtonItemStylePlain target:nil action:nil];
  </code></pre>
  
  <p>but how do you remove the native blue button?</p>