title: How to hide/show custom navigation bar?
body: <p>In my iOS application, I'm using custom <code>NavigationItem</code> (added to root view from Nib file). For default <code>NavigationItem</code> I can use</p>
  
  <p><code>[self.navigationController setNavigationBarHidden:YES animated:YES];</code></p>
  
  <p>to hide them, but I didn't find any way to hide my custom <code>NavigationItem</code> or <code>removeFromSuperview</code>, could somebody please kindly show me some pointers?</p>
  
  <p>Thanks in Advance!</p>