title: 'Transitioning between View Controllers from an NSObject
body: <p>I'd like to know what is the best way to transition back and forth between two view controllers from an <code>NSObject</code> outside of the code for those two view controllers in iOS 9. 
  For example, I have..
      <code>GameViewcontroller.h</code>
      <code>GameViewController.m</code>
      <code>TableViewController.h</code>
      <code>TableViewController.m</code>
      <code>Helper.h</code>
     <code>Helper.m</code></p>
  
  <p>I need <code>Helper.m</code> which is an NSObject, to be able to call a segue or transitional code so <code>GameViewController</code> and <code>TableViewController</code> transition between themselves without causing any memory or assertion issues.  </p>