“Scene support”是指iOS应用程序支持多个并行场景。这些场景可以显示在同一屏幕上，并允许用户同时使用多个窗口或视图控制器。为了支持场景，应用程序必须实现UISceneDelegate协议，并将每个场景配置为单独的窗口。

以下是一个简单的示例，演示如何在应用程序中使用场景。

首先，在SceneDelegate.swift中实现UISceneDelegate协议。

import UIKit

class SceneDelegate: UIResponder, UIWindowSceneDelegate {

    var window: UIWindow?

    func scene(_ scene: UIScene, willConnectTo session: UISceneSession, options connectionOptions: UIScene.ConnectionOptions) {
        guard let windowScene = (scene as? UIWindowScene) else { return }
        window = UIWindow(windowScene: windowScene)

        // Configure the scene.
        let viewController = ViewController()
        let navigationController = UINavigationController(rootViewController: viewController)
        window?.rootViewController = navigationController

        // Make the window visible.
        window?.makeKeyAndVisible()
    }

    // Implement other UISceneDelegate methods as needed.
}

接下来，修改AppDelegate.swift以使用新的SceneDelegate。

import UIKit

@UIApplicationMain
class AppDelegate: UIResponder, UIApplicationDelegate {

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

    // Replace the default UIWindow creation method.
    var window: UIWindow?
    func application(_ application: UIApplication, configurationForConnecting connectingSceneSession: UISceneSession, options: UIScene.ConnectionOptions) -> UISceneConfiguration {
        return UISceneConfiguration(name: "Default Configuration", sessionRole: connectingSceneSession.role)
    }

    // Implement other UIApplicationDelegate methods as needed.

    // Add scene support.
    func application(_ application: UIApplication, didDiscardSceneSessions sceneSessions: Set) {
    }
}

最后，在Info.plist中添加支持场景的键值。