Question

启动应用后，我想实例化一个ViewController。所以我实例化了控制器，但是却收到一个奇怪的错误

无法将类型'erkeb.HomeVC'（0x100bd8738）的值强制转换为'erkeb.ContainerVC'（0x100bd8990）

有人可以告诉我如何解决此问题吗？

@UIApplicationMain
class AppDelegate: UIResponder, UIApplicationDelegate {
    var window: UIWindow?

    fileprivate var containerVC = ContainerVC()

    var MenuContainerVC: ContainerVC{
        return containerVC
    }

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

        containerVC = ContainerVC()

        window = UIWindow(frame: UIScreen.main.bounds)

        let sb = UIStoryboard(name: "Main", bundle: nil)
        var intialViewController = sb.instantiateViewController(withIdentifier: "WelkomVC")

        let userDefaults = UserDefaults.standard

        if userDefaults.bool(forKey: "WelkomIntroIsOk"){
            intialViewController = sb.instantiateInitialViewController() as! ContainerVC
        }

        window?.rootViewController = intialViewController
        window?.makeKeyAndVisible()

        //normaal juist onder lijn 28 maar menu schuift niet open
//        window?.rootViewController = containerVC
//        window?.makeKeyAndVisible()

        return true
    }

Answer 1

您无需将sb.instantiateInitialViewController()强制转换为ContainerVC。如果UserDefaults的值为true，则以编程方式创建ContainerVC实例并在intialViewController中进行分配。 ContainerVC将被分配为根视图控制器。

if userDefaults.bool(forKey: "WelkomIntroIsOk") {
    intialViewController = ContainerVC()
}

我无法转换initialViewController

1 个答案: