title: NavigationController background image issue
body: <p>I've checked many solutions on line but I still have a problem with my NavigationController background image.</p>
  
  <p>This is my code:</p>
  
  <pre><code>[self.navigationController.navigationBar setBackgroundImage:[UIImage imageNamed:@"header_bg"] forBarMetrics:UIBarMetricsDefault];
  </code></pre>
  
  <p>The problem is that my bar changed it's looks (color mainly) but it still doesn't look like my image.</p>
  
  <p>Is there a better way to approach this?</p>