swift - TabBar 和 NavigationBar 的问题

Question

我在 TabBar 中有两个 View Controller 。我设置为如果用户已登录，则它直接显示 TabBar，否则它显示 loginViewController。查看 AppDelegate

中的代码

func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {
        UserDefaults.standard.register(defaults: ["NSApplicationCrashOnExceptions": true])

        let status = UserDefaults.standard.bool(forKey: "status")

        //StoryBoard Decide
        if (status == false){
            let storyBoard : UIStoryboard = UIStoryboard(name: "Tools", bundle:nil)
            let nextViewController = storyBoard.instantiateViewController(withIdentifier: "LoginViewController") as! LoginViewController
            let navigationController = UINavigationController(rootViewController: nextViewController)
            let appdelegate = UIApplication.shared.delegate as! AppDelegate
            appdelegate.window!.rootViewController = navigationController
        }else {
            let storyBoard : UIStoryboard = UIStoryboard(name: "Tools", bundle:nil)
            let nextViewController = storyBoard.instantiateViewController(withIdentifier: "tabbar") as! UITabBarController
            let navigationController = UINavigationController(rootViewController: nextViewController)
            let appdelegate = UIApplication.shared.delegate as! AppDelegate
            appdelegate.window!.rootViewController = navigationController
        }}

但是当我通过登录 ViewController 时它工作正常但是当用户已经登录时它在 HomeViewController 中显示导航栏。

这是我的 Storyboard设置。

以及如何使用 TabBar 管理导航。

Answer 1

因为你正在制作新的导航 Controller 然后添加标签栏作为它的 Root View 。

您可以这样做，而不是制作 UINavigationController:

替换

let nextViewController = storyBoard.instantiateViewController(withIdentifier: "tabbar") as! UITabBarController
let navigationController = UINavigationController(rootViewController: nextViewController)
let appdelegate = UIApplication.shared.delegate as! AppDelegate
appdelegate.window!.rootViewController = navigationController

与:

let nextViewController = storyBoard.instantiateViewController(withIdentifier: "tabbar") as! UITabBarController
self.window?.rootViewController = nextViewController
self.window?.makeKeyAndVisible()