以编程方式创建UITabBarController时,只显示一个选项卡

我有一个tabbar协调器,它包含一个uitabbar控制器。

我想添加两个UINavigationController(CoinPage和Top/Flop),但选项卡中只显示一个。我想我已经把一切都安排好了,我尝试了一些其他的东西,但我无法让它工作。

这是我的代码:

class TabBarCoordinator: Coordinator {
    var dependencys: DependencyManager


    let tabBarController: UITabBarController
    var tabCoordinators = [Tabs: Coordinator]()
    var navigationController: UINavigationController

    init(navigationController: UINavigationController, persistenceCentral: PersistenceCentral, dependencys: DependencyManager) {
        self.tabBarController = UITabBarController()
        self.navigationController = navigationController
        self.dependencys = dependencys
        var controllers: [UIViewController] = []

        tabCoordinators[.topFlop] = TopFlopCoordinator(navigationController: navigationController, dependencys: dependencys)

        tabCoordinators[.coinPage] = CoinPageCoordinator(dependencys: dependencys, navigationController: navigationController)

        let coinPageVC = tabCoordinators[.coinPage]!.navigationController
        coinPageVC.tabBarItem = UITabBarItem(title: "Coinpage", image: nil, tag: 0)


        let topFlopVC = tabCoordinators[.topFlop]!.navigationController
        topFlopVC.tabBarItem = UITabBarItem(title: "Top/Flop", image: nil, tag: 1)


        controllers.append(topFlopVC)
        controllers.append(coinPageVC)

        tabBarController.viewControllers = controllers
        tabBarController.tabBar.isTranslucent = false

        tabCoordinators[.topFlop]?.start()
        tabCoordinators[.coinPage]?.start()
    }

    func start() {

    }
}

我做了一些研究,例如,他以类似的方式设置选项卡: https://medium.com/@satindersingh71/uitabbarcontroller-programmatically-2a3df63607f1