title: UITabBarController - How to access a view controller?
body: <p>I have a uitabbarcontroller, which contains multiple tabs and viewControllers.
  I am trying to loop through the view controllers to find the right one and call a method.
  but the type of the view controller i get, each time i go through the loop is a UINavigationController. So how can i simply access a view controller in my tabBar?</p>
  
  <pre><code>for (UIViewController *v in self.tabBar.viewControllers)
  {
       if ([v isKindOfClass:[MyViewController class]])
       {
            MyViewController *myViewController = v;
            [v doSomething];
       }
  }
  </code></pre>