ios - 呈现自定义选项卡 View Controller 但出现黑屏

Question

我的目标是显示一个选项卡 View Controller ，该 Controller 管理多个选项卡，这些选项卡由包含 View Controller 的导航 Controller 组成。

我在 AppDelegate 中将选项卡 View Controller BaseTabBarController 设置为窗口我的 Root View Controller 。我的自定义选项卡 View Controller 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 Controller 类是导航 Controller 的空子类。

问题是应用程序显示标签栏几分之一秒，然后立即变成黑屏(控制台消息:“不鼓励在分离的 View Controller 上显示 View Controller ”)。我做错了什么？

Answer 1

您代码的其他部分一定有问题。当我使用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
}