title: Hide an item in the tabBar?
body: <p>i currently have a number of viewControllers that have a relationship with my tabBarController through Storyboard.  Given certain setting, i would like to programatically make a certain viewController hidden or visible.  I can hide the whole tabBar, but thats not what i'm after. I have been playing in Xcode and scouring interwebs, but can't find a solution. something along the lines of below that doesn't work me!</p>
  
  <pre><code>[[self.tabBarController.tabBar.items objectAtIndex:2] setHidden:YES];
  </code></pre>