title: Initialization for ViewController under NavController in TabBarController
body: <p>I have the relatively common setup of a TabBarController whose tabs contain NavigationControllers which have TableViewControllers as their roots. I'm trying to perform some logic on initialization of one of these TableViewControllers but can't seem to find what init function gets called.</p>
  
  <p>My goal is to add a listener in the TableViewController (that I have subclassed) which can respond to events by updating the navigationController.tabBarItem.badgeVluew property.</p>
  
  <p>I've tried putting code into initWithStyle: as well as init but neither of them end up getting called. I've also tried putting it in viewDidLoad, but that only gets called once the controller actually appears (I need to have it happen as soon as the controller is loaded / as soon as the tab bar item shows up).</p>
  
  <p>Does anyone know where I would put this code for it to happen on initialization of the controller?</p>
  
  <p>Also, this is all set up through interface builder / NIBs.  I'm not adding the nav controller or tableviewcontroller manually, which is why it's not clear what init function I need to override.</p>