UIWindow (An object that provides the backdrop for your app’s user interface and provides important event-handling)

  • Every view that appears onscreen is enclosed by a window, and each window is independent of the other windows in your app.
  • Events received by your app are initially routed to the appropriate window object, which is turn forwards those events to the appropriate view.

Handful tasks of Window Objects:

  • Setting the z-axis level of your window, which affects the visibility to the window relative to other windows.
  • Showing windows and making them the target of keyboard events.
  • Converting coordinate values to and from the window’s
  • Changing the root view controller of a window.
  • Changing the screen on which the window is displayed.
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