title: What happens with presenting viewController after it presents a presented viewController?
body: <p>What happens with presenting viewController after it presents a presented viewController. Does its instance live forward? Is it destroyed when it is obscured by presented viewController views? If it is destroyed, how do I tell the system not to destroy it, but keep it intact? </p>
  
  <p>I'm designing a game in witch the game is obscured with a presented viewController when some button is clicked. When the player returns to the game, I want it to restore its state exactly as it was before presenting a viewController</p>