title: How can i identify self.editButtonItem button's clicked event?
body: <p>I set my left bar button of UINavigationController as edit button using the code </p>
  
  <pre><code>leftBarButton = self.editButtonItem;
  </code></pre>
  
  <p>I want to change some disable/enable properties of other buttons with respect to the edit button's click action. </p>
  
  <p>How can i find whether the Edit button is pressed or not?</p>