ios - 我无法在 swift ios 中从 appdelegate 访问 tabbarcontroller

Question

func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {

    self.window?.backgroundColor = UIColor.white
    self.window?.makeKeyAndVisible()

    let tabBarController = UITabBarController()
    let myVC1 = ViewController(nibName: "ViewController", bundle: nil)
    let myVC2 = ViewController1(nibName: "ViewController1", bundle: nil)
    let controllers = [myVC1,myVC2]
    tabBarController.viewControllers = controllers
    window?.rootViewController = tabBarController
    let firstImage = UIImage(named: "Search")
    let secondImage = UIImage(named: "Search1")
    myVC1.tabBarItem = UITabBarItem(
        title: "Pie",
        image: firstImage,
        tag: 1)
    myVC2.tabBarItem = UITabBarItem(
        title: "Pizza",
        image: secondImage,
        tag:2)
    // Override point for customization after application launch.
    return true

每当我运行该应用程序时都会出现黑屏。

Answer 1

我认为你没有避免 UIWindow 大小window = UIWindow(框架:UIScreen.main.bounds)window?.rootViewController = UITabBarController()

或者你在设置 Root View Controller 时遇到了一些问题。