title: How do you get a handle to view controllers in a storyboard for transitioning within a container controller
body: <p>My issue is I want to call transitionFromViewController:toViewController::: to change view controllers in a container view. But if the first controller is not created programatically but instead is created by the storyboard then how can I get a handle to it in order to pass it to transitionFromViewController?  </p>
  
  <p>More details:</p>
  
  <p>I want to create a container controller that contains either controller A or controller B at app launch depending upon a  flag read from defaults.</p>
  
  <p>In my storyboard I have placed a container view within the initial controller and when doing so IB automatically created a linked VC scene, which I have set as View Controller A.</p>
  
  <p>I have also created a scene for view controller B (however am unable to link it to the initial view controller as doing so disconnects view controller A. So I presume IB only permits one VC to be connected to a container view).</p>
  
  <p>In the initial controller's viewDidLoad I am planning to place a call to transitionToViewController to switch from controller A to controller B depending upon the state flag.
  The problem is how do I get a handle to controller A? I am not creating controller A in code, IB is creating it automatically - so I tried adding a property for it in the initial controller but IB does not permit me to drag and drop a link using the IB assistant between controller A and the property. So how else can I get a handle to it in order to pass it to transitionToViewController:?</p>