在导航控制器中更改视图控制器

点击注销按钮时，从导航控制器中取出VC1并添加VC2

if var viewControllers = self.navigationController?.viewControllers {
    viewControllers.removeLast()
    viewControllers.append(VC2())
    self.navigationController?.setViewControllers(viewControllers, animated: true)
}

再次登录VC2时，再次更改视图控制器

self.navigationController?.setViewControllers([VC1()], animated: true)

在标签栏控制器中更改视图控制器

退出

if var viewControllers = self.tabBarController?.viewControllers {
    let newVC = UINavigationController(rootViewController: VC2())
    newVC.tabBarItem = UITabBarItem(title: "Log In", image: nil, tag: 0)
    viewControllers.removeFirst()
    viewControllers.insert(newVC, at: 0)
    self.tabBarController?.viewControllers = viewControllers
}

登录

if var viewControllers = self.tabBarController?.viewControllers {
    let newVC = UINavigationController(rootViewController: VC1())
    newVC.tabBarItem = UITabBarItem(title: "Home", image: nil, tag: 0)
    viewControllers.removeFirst()
    viewControllers.insert(newVC, at: 0)
    self.tabBarController?.viewControllers = viewControllers
}

你可以覆盖窗口rootviewcontroller新的选项卡控制器。因此，在未来你不会有任何错误与新的发展（新的屏幕层次结构）。

//Login
    let navigation = UINavigationController.init(rootViewController: vc1)
    let tabVC = UITabBarController()
    tabVC.viewControllers?.append(navigation)
    self.appDelegate?.window?.rootViewController = navigation

    //Logout
    let navigation = UINavigationController.init(rootViewController: vc2)
    let tabVC = UITabBarController()
    tabVC.viewControllers?.append(navigation)
    self.appDelegate?.window?.rootViewController = navigation

func userNotificationCenter（_ center：UNUserNotificationCenter，did接收响应：UNNotificationResponse，withCompletionHandler completionHandler：@escaping（）-> Void）{

let userInfo = response.notification.request.content.userInfo
    print("didReceive2: ", userInfo)
    Messaging.messaging().appDidReceiveMessage(userInfo)
    
        //        NotificationCenter.default.post(name: NotificationName.openRaceDAyTipsTab, object: nil)
    
    let application = UIApplication.shared
    
    if(application.applicationState == .active) {
        print("user tapped the notification bar when the app is in foreground")
    }
    
    if(application.applicationState == .inactive) {
        print("user tapped the notification bar when the app is in background")
    }
    
    guard let rootViewController = (UIApplication.shared.connectedScenes.first?.delegate as? SceneDelegate)?.window?.rootViewController else {
        return
    }
    print("got active scene")
    
    
        // handle the push notification here
    if let articleId = userInfo["articleId"] as? String {
            // use the articleId in your app logic
            // Create an instance of ArticlesDetailViewController
        let articlesDetailVC = ArticlesDetailViewController.instantiateHome()
        articlesDetailVC.articlesId = articleId
        
        if let tabBarVC = rootViewController as? UITabBarController,
           let navVC = tabBarVC.selectedViewController as? UINavigationController {
            navVC.pushViewController(articlesDetailVC, animated: true)
        }
    }
    
    completionHandler()
}