Keep window always on top?

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To change the window level you can’t do it inside viewDidload because view’s window property will always be nil there but it can be done overriding viewDidAppear method or any other method that runs after view is installed in a window (do not use it inside viewDidLoad):

Swift 4 or later

override func viewDidAppear() {
    super.viewDidAppear()
    view.window?.level = .floating
}

For older Swift syntax check the edit history

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