title: How to set the image on rightBarButtonItem of UINavigationBar?
body: <p>I am trying to set the image on rightBarButtonItem and its fine but the only thing wrong is the background behind this image which has more width than my image. 
  Anybody has any idea how to fix this.
  Code:</p>
  
  <pre><code>[self.navigationItem setRightBarButtonItem:[[UIBarButtonItem alloc] initWithImage:[UIImage imageNamed:@"action_btn.png"] style:UIBarButtonItemStyleBordered target:self action:@selector(actionButtonClicked:)] animated:YES];
  </code></pre>