title: Disabling a Navigation Bar Button Item
body: <p>When setting the right navigation bar button to disabled, it does not change its color to signal its disabled state to the user.</p>
  
  <p>It remains "highlighted", non-greyed-out.</p>
  
  <p>I have set up the button in Storyboard as follows:</p>
  
  <p><img src="https://i.stack.imgur.com/3BTi4.png" alt="enter image description here"></p>
  
  <pre><code>self.navigationController.navigationItem.rightBarButtonItem.enabled = NO;
  </code></pre>
  
  <p>What do I need to do to change the button`s state visually too?</p>
  
  <p>Thank you!</p>