ios - 当应用程序 didFinishLaunching 时如何转到我想要的 Controller

Question

当我启动我的应用程序时，我想转到自定义 view controller，但是 storyboard 中的默认第一个 controller:

我想在启动我的 app 时转到棕色 vc:

我的方法如下，但是出现黑屏 Unable to capture view hierarchy

1)在Info.plist中，删除Main storyboard file base name这一行

2)在我的Appdelegate.swift中:

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

    let sb:UIStoryboard = UIStoryboard.init(name: "Main", bundle: nil)

    let nav: CustomNavController = sb.instantiateViewController(withIdentifier: "CustomNavController") as! CustomNavController

    let red_vc:ViewController = sb.instantiateViewController(withIdentifier: "ViewController") as! ViewController

    let green_vc:ViewController2 = sb.instantiateViewController(withIdentifier: "ViewController2") as! ViewController2

    let brown_vc:ViewController3 = sb.instantiateViewController(withIdentifier: "ViewController3") as! ViewController3


    nav.viewControllers = [red_vc, green_vc, brown_vc]

    self.window? = UIWindow.init(frame: UIScreen.main.bounds)

    self.window?.rootViewController = nav

    self.window?.makeKeyAndVisible()

    return true
}

结果得到黑屏屏幕:

我错了哪一步？我怎样才能做好呢？启动我的应用程序时，我想转到棕色 vc。

---

尝试 - 1

使用push 到brown vc，也是不行的:

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

    let sb:UIStoryboard = UIStoryboard.init(name: "Main", bundle: nil)

    let nav: CustomNavController = sb.instantiateViewController(withIdentifier: "CustomNavController") as! CustomNavController

    let red_vc:ViewController = sb.instantiateViewController(withIdentifier: "ViewController") as! ViewController

    let green_vc:ViewController2 = sb.instantiateViewController(withIdentifier: "ViewController2") as! ViewController2

    let brown_vc:ViewController3 = sb.instantiateViewController(withIdentifier: "ViewController3") as! ViewController3

    //nav.viewControllers = [red_vc, green_vc, brown_vc]

    nav.pushViewController(red_vc, animated: false)

    nav.pushViewController(green_vc, animated: false)

    nav.pushViewController(brown_vc, animated: false)

    self.window? = UIWindow.init(frame: UIScreen.main.bounds)

    self.window?.rootViewController = nav

    self.window?.makeKeyAndVisible()

    return true
}

Answer 1

您无需删除 Info.plist 中的主 Storyboard文件基名

在 AppDelegate 中:

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

        let mainStoryboard = UIStoryboard.init(name: "Main", bundle: nil)
        let brownVC = mainStoryboard.instantiateViewController(withIdentifier: "brownVCIdentifier") as! BrownViewController
        let navigationController = application.windows[0].rootViewController as! UINavigationController
        navigationController.isNavigationBarHidden = true
        navigationController.pushViewController(brownVC, animated: false)
        return true
    }

(或)

在 RedViewController(第一个 viewController)中:

override func viewWillAppear(_ animated: Bool) {
        super.viewWillAppear(animated)
        let brownVC = storyboard?.instantiateViewController(withIdentifier: "brownVCIdentifier") as! BrownViewController
        navigationController?.isNavigationBarHidden  = true
        navigationController?.pushViewController(brownVC, animated: false)

    }

Github 链接:

https://github.com/k-sathireddy/DirectNavigationSample