To create a new UIWindow over the main window

Question

In my app I want to create a new UIWindow over the main UIWindow, And I wrote as following, but it don\'t works. first, i create a UIWindow as the

Answer 1

Xcode 8 + Swift

class ViewController: UIViewController {
    var coveringWindow: UIWindow?
    
    func coverEverything() {
        coveringWindow = UIWindow(frame: (view.window?.frame)!)
        
        if let coveringWindow = coveringWindow {
            coveringWindow.windowLevel = UIWindowLevelAlert + 1
            coveringWindow.isHidden = false
        }
    }
}

According to the documentation, to receive events that do not have a relevant coordinate value, such as keyboard entry, make it key instead of merely ! isHidden:

coveringWindow.makeKeyAndVisible()

You can even control the transparency of its background, for a smoke effect:

coveringWindow.backgroundColor = UIColor(white: 0, alpha: 0.5)

Note that such window needs to handle orientation changes.