使用Xcode11.3的iOS 13上不显示条形图

Question

iOS 13.2上未显示UITabBar

@UIApplicationMain
class AppDelegate: UIResponder, UIApplicationDelegate {

    var window: UIWindow?

    func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {
        // Override point for customization after application launch.
        FirebaseApp.configure()

        window = UIWindow(frame: UIScreen.main.bounds)
        let rootViewController = UITabBarController()
        rootViewController.viewControllers = [RecordController()]
        window?.rootViewController = rootViewController
        window?.makeKeyAndVisible()

        return true
    }
}

iOS 13.2上未显示UINavigationBar

@UIApplicationMain
class AppDelegate: UIResponder, UIApplicationDelegate {

    var window: UIWindow?

    func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {
        // Override point for customization after application launch.
        FirebaseApp.configure()

        window = UIWindow(frame: UIScreen.main.bounds)
        window?.rootViewController = UINavigationController(rootViewController: RecordController())
        window?.makeKeyAndVisible()

        return true
    }
}

这在iOS 12和更早的版本上非常有效

Answer 1

如果您使用的是13.2，则需要替换场景代理中的代码。如果xcode中没有场景委托，则在didFinishLaunchingWithOptions委托中使用此条件。

希望它能为你工作。谢谢

    if #available(iOS 13, *) {
        return //code for ios 13
    } else {
        return // code for ios 12 or lower version
    }