Swift4中的通知单击操作

Question

我用Swift4 Xcode 9构建了一个包含推式通知的应用程序，我希望当我单击推式通知时它将移动到某个viewController。例如，有viewControllerA，viewControllerB，viewControllerC。当单击通知A时，它将转到viewControllerA。我该怎么做。我刚学过Swift。请帮忙，谢谢。

AppDelegate.swift

func userNotificationCenter(_ center: UNUserNotificationCenter, didReceive response: UNNotificationResponse, withCompletionHandler completionHandler: @escaping () -> Void) {

        let notifIdentifier = response.notification.request.identifier
        print("Notification identifier: \(notifIdentifier)")

        switch response.actionIdentifier {
        case "open":
            print("Open")
            self.showCashout()
            completionHandler()
        default:
            completionHandler()
        }

        completionHandler()
    }

    func showCashout() {
        let mainStoryboard : UIStoryboard = UIStoryboard(name: "Main", bundle: nil)
        let initialViewController: UIViewController = mainStoryboard.instantiateViewController(withIdentifier: "cashoutVC") as! CashoutController
        self.window = UIWindow(frame: UIScreen.main.bounds)
        self.window?.rootViewController?.present(initialViewController, animated: true, completion: nil)

    }

func createNotification(title: String, body: String) {
        let content = UNMutableNotificationContent()
        content.title = NSString.localizedUserNotificationString(forKey: title, arguments: nil)
        content.body = NSString.localizedUserNotificationString(forKey: body, arguments: nil)
        content.sound = UNNotificationSound.default()
        content.badge = NSNumber(integerLiteral: UIApplication.shared.applicationIconBadgeNumber + 1)
        content.categoryIdentifier = "Category"

        let request = UNNotificationRequest.init(identifier: "PushNotif", content: content, trigger: nil)

        let center = UNUserNotificationCenter.current()

        let openAction = UNNotificationAction.init(identifier: "open", title: "Open", options: UNNotificationActionOptions.foreground)
        let categories = UNNotificationCategory.init(identifier: "Category", actions: [openAction], intentIdentifiers: [], options: [])

        center.setNotificationCategories([categories])

        center.add(request)
    }