Swift 5. 目标：使应用程序在不使用 segues 的情况下打开特定的 View Controller答案

【问题标题】：Swift 5. Objective: make the app open a specific View Controller without using seguesSwift 5. 目标：使应用程序在不使用 segues 的情况下打开特定的 View Controller
【发布时间】：2020-01-10 19:55:55
【问题描述】：

此代码在 AppDelegate 中。 Xcode 不会抛出任何错误，但是当我在其他视图控制器按钮中调用 func 时，此代码不起作用。（在 View Controller VC1 或 VC2 上打开应用程序）召回代码： (UIApplication.shared.delegate as!AppDelegate).configureInitialViewController()

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

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

        configureInitialViewController()
        return true
    }

    **// determins which VC will be initially launched.**
    func configureInitialViewController() {
        var initialVC: UIViewController
        let storyboard = UIStoryboard(name: "Main", bundle: nil)
        if 1 > 0 {
            initialVC = storyboard.instantiateViewController(withIdentifier: VC1)
        } else {
            initialVC = storyboard.instantiateViewController(identifier: VC2)
        }
        window?.rootViewController = initialVC
        window?.makeKeyAndVisible()

    }

【问题讨论】：

在 iOS 13 Xcode 11 中，窗口属于场景委托，而不是应用委托。
参考这篇文章：stackoverflow.com/questions/26753925/…

标签： xcode swift5 swift5.1

【解决方案1】：

采纳了你的建议，马特。（SceneDelegate.swift 文件）这是代码：

var window: UIWindow?

func scene(_ scene: UIScene, willConnectTo session: UISceneSession, options connectionOptions: UIScene.ConnectionOptions) {
        guard let windowScene = (scene as? UIWindowScene) else { return }
        window = UIWindow(frame: windowScene.coordinateSpace.bounds)
        window?.windowScene = windowScene
        if 1 > 0 {
            window?.rootViewController = UIStoryboard(name: "Main", bundle: nil).instantiateViewController(withIdentifier: "INPUT YOUR STORYBOARD ID HERE")
        } else {
            window?.rootViewController = UIStoryboard(name: "Main", bundle: nil).instantiateViewController(withIdentifier: "INPUT YOUR STORYBOARD ID HERE")
        }
        window?.makeKeyAndVisible()


}

【讨论】：