title: ReactNative get the absolute position of a view relative to the screen
body: <p>with react native.</p>
  
  <p>I can get the position and size with <code>onLayout</code>, but I want to get the absolute position of a view relative to the screen</p>
  
  <p>please! the absolute position of a view relative to the screen</p>
  
  <p>not the absolute position of a view relative to the parent view</p>
  
  <p>What should I do?</p>