title: Set navigation bar image in iOS 7
body: <p>I want to convert my current project from iOS 6 to iOS 7. 
  In iOS 6 my project is working fine, but in iOS 7 navigation bar image is not showing properly.</p>
  
  <p>I used this code snippet for iOS 6,</p>
  
  <pre><code>UIImage *imgNav = [UIImage imageNamed:@"navigation.png"];
  self.navigationController.navigationBar.frame = CGRectMake(0, 0, 320, 44);
  [self.navigationController.navigationBar setBackgroundImage:imgNav forBarMetrics:
       UIBarMetricsDefault];
  </code></pre>
  
  <p>How can I set the navigation bar image in iOS 7?</p>