TabBar 和 NavigationBar 的问题

Question

我在 TabBar 中有两个视图控制器。我设置为如果用户已登录，则它直接显示 TabBar，否则它显示登录 ViewController。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
        }}

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

这是我的故事板设置。

以及如何使用 TabBar 管理导航。

Answer 1

因为你正在制作新的导航控制器然后添加标签栏作为它的根视图。

你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()

TabBar 和 NavigationBar 的问题

Issues with the TabBar and NavigationBar

uitabbarcontroller

uinavigationcontroller

swift