title: How do I change the title of the "back" button on a Navigation Bar
body: <p>Currently the left bar button default value is the title of the view that loaded the current one, in other words the view to be shown when the button is pressed (back button).</p>
  
  <p>I want to change the text shown on the button to something else.</p>
  
  <p>I tried putting the following line of code in the view controller's viewDidLoad method but it doesn't seem to work.</p>
  
  <pre><code>self.navigationItem.leftBarButtonItem.title = @"Log Out";
  </code></pre>
  
  <p>What should I do?</p>
  
  <p>Thanks.</p>