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when my app is recording，I click recording in statusbar on the left, then it post the captured false notification below with alert, but I havent click stop button in alert; then it post the captured true notification when I click cancel button. it should not post notification when I click the stop button? it was some bug for this problem?     private func addNotificationForCaptured() {         NotificationCenter.default.addObserver(self, selector: #selector(screenCapturedDidChange), name:  UIScreen.capturedDidChangeNotification, object: nil)     }     @objc func screenCapturedDidChange(noti: Notification) {         if let screen: UIScreen = noti.object as? UIScreen {             print(screen.isCaptured)         }     }