Window property :
var window: UIWindow?
the window property used to present the app’s visual content on the device’s main screen.
Normally, Xcode provides your app's main window. New iOS projects use storyboards to define the app’s views. Storyboards require the presence of a window property on the app delegate object, which the Xcode templates automatically provide. If your app does not use storyboards, you must create this window yourself.
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