Question

我正在创建一个包含快速入门屏幕的应用程序。在AppDelegate.swift中，我将navigationController设置为根视图控制器。但我有一个入门屏幕，需要将其添加到代码中。每当我运行应用程序时，我都会Thread 1: SIGNAL SIBAGRT。这是我的代码：

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

    window = UIWindow(frame: UIScreen.main.bounds)
    let sb = UIStoryboard(name: "Onboarding", bundle: nil)
    let initialViewController = sb.instantiateInitialViewController()
    window?.rootViewController = initialViewController
    window?.makeKeyAndVisible()


  let navigationController = window!.rootViewController as! UINavigationController

    let controller = navigationController.viewControllers[0] as! AllListsViewController
    controller.dataModel = dataModel

Answer 1

试试：

window = UIWindow(frame: UIScreen.main.bounds)
let storyboard = UIStoryboard(named:"Onboarding",bundle: nil)
let nvc = storyboard.instantiateInitialViewController() as? UINavigationController // since your storyboard start with a navigationController 
let topVc = nvc.topViewController as? AllListsViewController // then we get the first controller associated to that navigationController 
topVc?.dataModel = dataModel 
window?.rootViewController = nvc // still set your navigationController as the root of your application 
window?.makeKeyAndVisible()

即使导航控制器是rootView，如何在屏幕上放置一个入门屏幕

1 个答案: