title: UINavigationController UIBarButtonItem Push Segue
body: <p>When I view a UIBarButtonItem and drag from Connections Inspector the "push" segue, I can connect it to another view controller in the storyboard. When I run it and click the UIBarButtonItem the ViewController I connected up in IB magically appears.</p>
  
  <p>My question is: where does this happen? This, "push" event. Is there a method in a parent ViewController? Something like: "PushSegue"? I'd like to pass information to the connected ViewController from the navigation view controller.  For example, if I wanted to popup a UIAlertView at that moment, where would I do that? Somewhere in the ViewController class?</p>