title: hiding title of navigationbar
body: <p>my first view named "back". I need to hidden the title of the navigationbar because I have my custom navigation bar. </p>
  
  <p>I try with this code but it didn't work!</p>
  
  <pre><code>self.title = @"back";
  self.navigationController.navigationItem.titleView.hidden = YES;
  </code></pre>