Question

在UIKit iOS 13中进行更改之前，如何在SceneDelegate处设置rootViewController？

class SceneDelegate: UIResponder, UIWindowSceneDelegate {

    var window: UIWindow?


    @available(iOS 13.0, *)
    func scene(_ scene: UIScene, willConnectTo session: UISceneSession, options connectionOptions: UIScene.ConnectionOptions) {
        guard let _ = (scene as? UIWindowScene) else { return }

    }

Answer 1

仅供参考，因为如果您仅创建一个新的SwiftUI项目，SwiftUI不会使用情节提要，它将为您提供代码；您需要做的就是用所需的根VC替换UIHostingViewController，如下所示：

class SceneDelegate: UIResponder, UIWindowSceneDelegate {

  var window: UIWindow?

  func scene(_ scene: UIScene, willConnectTo session: UISceneSession, options connectionOptions: UIScene.ConnectionOptions) {

    if let windowScene = scene as? UIWindowScene {
        let window = UIWindow(windowScene: windowScene)
        window.rootViewController = MyRootViewController()
        self.window = window
        window.makeKeyAndVisible()
    }
  }

Answer 2

如果您发现自己需要从委托（iOS12和iO13）访问窗口以更改rootviewcontroller，则可以使用以下扩展名：

import { Link } from '@reach/router'

Answer 3

赞：

class SceneDelegate: UIResponder, UIWindowSceneDelegate {

   var window: UIWindow?
   func scene(_ scene: UIScene, willConnectTo session: UISceneSession, options connectionOptions: UIScene.ConnectionOptions) {
         // Use this method to optionally configure and attach the UIWindow `window` to the provided UIWindowScene `scene`.
         // If using a storyboard, the `window` property will automatically be initialized and attached to the scene.
         // This delegate does not imply the connecting scene or session are new (see `application:configurationForConnectingSceneSession` instead).
        guard let _ = (scene as? UIWindowScene) else { return }

        let rootVC = self.window?.rootViewController 
    }
    // ... the rest of SceneDelegate
}

如here所示。

Answer 4

如果您不需要支持多窗口支持，请忽略它。我跟进this answer。

使用它启动新项目时，它会自动创建清单和SceneDelegate类。忽略多窗口支持后，您可以像以前一样再次使用应用程序委托窗口。

如何在Scene Delegate iOS 13中设置rootViewController

4 个答案: