title: Change color of UINavigationController back button
body: <p>I'm having problems trying to figure out how to change the color of the buttons on the navigation controller. </p>
  
  <p>Previously I had used the following:</p>
  
  <pre><code>[[UIBarButtonItem appearance] setTintColor:[UIColor colorWithRed:226/255.0 green:66/255.0 blue:66/255.0 alpha:0.0]];
  </code></pre>
  
  <p>and this worked, but I added a new view with a toolbar, and the tool bar button images will not show.  If I remove the global coloring, the tool bar items show just fine.</p>
  
  <p>I've tried setting the tint color on both the <strong>leftBarButtonItem</strong> and the <strong>backBarButtonItem</strong> in the <strong>viewDidLoad</strong> method of the view, but both of those properties appear to be null.</p>
  
  <p>I don't want to change the color of the entire navigation bar, just the buttons.  Is there a way to do this?</p>