title: Flashing when switching between view controllers
body: <p>I got 2 view controllers and I'm having trouble to switch between them. For example:</p>
  
  <p>I displayed view controller A. The user taps a button and I have to display view controller B. I need to close A and open B. The problem is that when I close A and open B, the screen flashes for a second instead of just showing B. I believe I have to freeze graphics or something like that. Since I might have to switch back from B to A or even from B to C or A to C or C to B, opening B from A is not an option.</p>
  
  <p>Does anyone know any kind of solution for that? </p>
  
  <p>TIA!</p>