title: iOS - Get location of a view in a window?
body: <p>I have a UIView that displays a popup after it's been clicked.
  The popup needs to be added to the main UIWindow to make sure that it goes on top of everything else.</p>
  
  <p>I want the position of this popup to be relative to my UIView, so I need to know the relative location of my UIView in the window.</p>
  
  <p>Question: How can I find the location of a UIView in a UIWindow when the UIView is not directly in the UIWindow (It's inside the view of my viewController)?</p>