title: Add an image to a navigation bar
body: <p>I want to change the <strong>image</strong>, the title and the color of a backButton in the navigationBar. Here the code:</p>
  
  <pre><code>UIButton* backButton = (UIButton *) [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"BackButtonTopBar.png"]];
  UIBarButtonItem *backButtonItem = [[UIBarButtonItem alloc] initWithCustomView:backButton];
  self.navigationItem.leftBarButtonItem = backButtonItem;
  
  self.navigationController.navigationBar.tintColor = [UIColor blackColor]; 
  
  UIImage *image = [UIImage imageNamed: @"TopBar.png"];
  UIImageView *imageView = [[UIImageView alloc] initWithImage: image];
  self.navigationItem.titleView = imageView;
  </code></pre>
  
  <p>but I have some problems:</p>
  
  <ol>
  <li>the black color not point</li>
  <li>the back image not working</li>
  </ol>
  
  <p>So someone can help me? Thanks.</p>