ios - Get UIWindow without using AppDelegate -

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I need to add a view directly to the window. I can access it through the UDIpplication on the AppDelegate Window Object I can do I intend to make this code as reusable as possible, even though it makes the method unusable. How can I use the UI window program without using the AppendageGate?

I am coding in Swift but the examples of objective-C can also be useful.

There is a reference to the current window of any view.

In a UIViewController: 

  self.view.window

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