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

每当我运行应用程序时都会出现黑屏。

Answer 1

我认为你不会破坏UIWindow的大小 window = UIWindow（frame：UIScreen.main.bounds）窗口？.rootViewController = UITabBarController（）

或者您在设置根视图控制器时遇到了一些问题。

Answer 2

您需要在app Delegate didFinishLaunchingWithOptions的开头添加window = UIWindow：否则没有设置帧大小。这就是为什么你的黑屏。

__setitem__

我无法从swift ios中的appdelegate访问tabbarcontroller

2 个答案: