title: How can i change color of one screen from another screen in swift?
body: <p>I have "screen A" and "Screen B", I have button on "screen A" using which I can navigate to "screen B",</p>
  
  <p>On "screen B" I have two buttons "Button red" and "Button Green", I want to change color of "screen A" by pressing buttons on "screen B"</p>
  
  <p>I want to do this using delegate</p>
  
  <p>even solution in Objective-C also helpful </p>