Using Additional Window to hide sensitive data

AdditionalWindowToHideSensitiveData.swift

@UIApplicationMain
class AppDelegate: UIApplicationDelegate {
    
    var window: UIWindow?
    
    private lazy var backgroundWindow: UIWindow = {
        let screen = UIScreen.main
        let window = UIWindow(frame: screen.bounds)
        window.screen = screen
        window.rootViewController = BlockViewController()
        window.windowLevel = .alert
        return window
    }()
    
    // MARK: - App
    
    func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {
        // Setup your app here ...
        return true
    }
    
    // MARK: - Handling Application Background State
    
    func applicationDidEnterBackground(_ application: UIApplication) {
        backgroundWindow.isHidden = true
    }

    func applicationWillEnterForeground(_ application: UIApplication) {
        backgroundWindow.isHidden = false
    }
}