ios - 实例化一个vc保持导航栏为Swift

我想在响应远程通知操作时显示NewMapViewController，但是如果直接实例化NewMapViewController，则会松开导航栏。如果我改为实例化navigationController并执行segue，则我看到所有视图控制器（启动和登录）一个接一个地显示，这是非常不愉快的。有没有一种方法可以将导航栏保持在NewMapViewController中，并避免级联显示所有视图控制器？和往常一样，非常感谢您的帮助。

这是我尝试的：

case Id.checkActionIdentifier:
            print("Check tapped")
            let userInfo = response.notification.request.content.userInfo
            if let routeToCheck = userInfo[NSLocalizedString("Route", comment: "")] as? String {
                RoutesArray.routeName = routeToCheck
//                print("rotta is: \(routeToCheck)")
            }
//            let content = response.notification.request.content
//            print(" Body \(content.body)")
//            print(" Title \(content.title)")
            NewMapViewController.routeCheckCounter = 1

            //  Goes to NewMapViewController but showing the splash and login VC first
            let storyboard = UIStoryboard(name: "Main", bundle: nil)
            let initialViewController : UINavigationController = storyboard.instantiateViewController(withIdentifier: "MainNavigationController") as! UINavigationController
            self.window?.rootViewController = initialViewController
            self.window?.makeKeyAndVisible()
            let vc = initialViewController.viewControllers[0]
            vc.performSegue(withIdentifier: "alertToMapSegue", sender: nil)

            // goes straight to NewMapViewController but looses nav bar
//            let storyboard = UIStoryboard(name: "Main", bundle: nil)
//            let initialViewController : UIViewController = storyboard.instantiateViewController(withIdentifier: "NewMapViewController") as! NewMapViewController
//            self.window?.rootViewController = initialViewController
//            self.window?.makeKeyAndVisible()

更新：

我已经能够避免通过登录vc，但是仍然在NewMapViewController之前显示启动画面并显示以下代码：

let storyboard = UIStoryboard(name: "Main", bundle: nil)
            let vc = storyboard.instantiateViewController(withIdentifier: "NewMapViewController") as UIViewController
            self.window?.rootViewController?.show(vc, sender: self)

最佳答案

看来window的rootViewController已经是UINavitationController了，所以您只需按以下方法抓取并按下NewMapViewController。

 case Id.checkActionIdentifier:
     let userInfo = response.notification.request.content.userInfo
     if let routeToCheck = userInfo[NSLocalizedString("Route", comment: "")] as? String {
         RoutesArray.routeName = routeToCheck
     }
     NewMapViewController.routeCheckCounter = 1

     if let navigationVC = self.window?.rootViewController as? UINavigationController {
         let main = UIStoryboard(name: "Main", bundle: nil)
         let newMapVC = main.instantiateViewController(withIdentifier: "NewMapViewController") as! NewMapViewController
         navigationVC.pushViewController(newMapVC, animated: true)
     }