title: id type to NSString
body: <p>is there any way by which I can change an id type to NSString object?
  note the following line of my code.</p>
  
  <pre><code>NSString *value = [appDelegate.bird_arr objectAtIndex:rowClicked] ;
  </code></pre>
  
  <p>in this appDelegate is object of my AppDelegate class in a navigation based program and bird_arr is object of NSMutableArray.
  I want to use the string written in row which is clicked. But objectAtIndex: returns id type.
  Do we have any way to change this id type to NSString or any other way by which I can collect string inside the specific row?</p>