Question

我的目标是显示一个标签视图控制器，该控制器管理由包含视图控制器的导航控制器组成的多个标签。

我将选项卡视图控制器BaseTabBarController设置为AppDelegate中的根视图控制器窗口。我的自定义选项卡视图控制器如下所示：

class BaseTabBarController: ESTabBarController {

    override func viewDidLoad() {
        super.viewDidLoad()
        view.backgroundColor = .red

        let v1 = BaseNavigationController(rootViewController: SubscriptionsController())
        let v2 = BaseNavigationController(rootViewController: SubscriptionsController())

        v1.tabBarItem = ESTabBarItem(title: "Home", image: #imageLiteral(resourceName: "tab_bar_home"), selectedImage: #imageLiteral(resourceName: "tab_bar_home"))
        v2.tabBarItem = ESTabBarItem(title: "Home", image: #imageLiteral(resourceName: "tab_bar_home"), selectedImage: #imageLiteral(resourceName: "tab_bar_home"))

        self.viewControllers = [v1, v2]
        self.hidesBottomBarWhenPushed = true
    }
}

我的自定义导航控制器类是导航控制器的空子类。

问题是应用程序显示标签栏几分之一秒，并立即变成黑屏（控制台消息：“不建议在分离的视图控制器上显示视图控制器”）。我做错了什么？

Answer 1

代码的其他部分出现了问题。当我接受你的代码并像这样使用它时，一切都按预期工作：

class BaseTabBarController: UITabBarController {
    override func viewDidLoad() {
        super.viewDidLoad()
        view.backgroundColor = .red

        let v1 = UINavigationController(rootViewController: UIViewController())
        let v2 = UINavigationController(rootViewController: UIViewController())

        v1.tabBarItem = UITabBarItem(title: "Home", image: nil, selectedImage: nil)
        v2.tabBarItem = UITabBarItem(title: "Home", image: nil, selectedImage: nil)

        self.viewControllers = [v1, v2]
        self.hidesBottomBarWhenPushed = true
    }
}

func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {
    // Override point for customization after application launch.
    window = UIWindow(frame: UIScreen.main.bounds)
    window?.rootViewController = BaseTabBarController()
    window?.makeKeyAndVisible()

    return true
}

呈现自定义标签视图控制器但获得黑屏

1 个答案: