UITabBar项目在应用启动时未处于活动状态

Question

I have UITabBar Controller

let tabBarController = UITabBarController()
tabBarController.viewControllers = [todayViewController, forecastViewController]
window.rootViewController = tabBarController
window.makeKeyAndVisible()
tabBarController.selectedIndex = 0

内todayViewController：

tabBarItem = UITabBarItem(title: "Today", image: #imageLiteral(resourceName: "TodayTabBarItem"), selectedImage: #imageLiteral(resourceName: "SunTabBarItemSelected"))

内部forecastViewController：

tabBarItem = UITabBarItem(title: "Forecast", image: #imageLiteral(resourceName: "ForecastTabBarItem"), selectedImage: #imageLiteral(resourceName: "ForecastTabBarItemSelected"))

当我启动应用程序时，第一个视图控制器的UITabBarItem处于非活动状态。当我点击它或另一个时，它会变得活跃(突出显示的文本和右图(

我应该怎么做才能在应用程序启动时UITabBarItem处于活动状态？

Answer 1

Try tabBarItem = UITabBarItem 不是在调用 viewDidLoad 期间，而是在创建 ViewContrller 时 - 在 init 中