如何用SpriteKit在Xcode13中以编程方式设置根视图控制器？

import SpriteKit

func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {
    // 创建一个SKView实例
    let skView = SKView(frame: UIScreen.main.bounds)
    
    // 设置根视图控制器为SKView实例
    window?.rootViewController = skView
    
    return true
}

func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {
    // 创建一个SKView实例
    let skView = SKView(frame: UIScreen.main.bounds)
    
    // 创建一个SKScene实例
    let scene = GameScene(size: skView.bounds.size)
    
    // 将SKScene设置为SKView的场景
    skView.presentScene(scene)
    
    // 设置根视图控制器为SKView实例
    window?.rootViewController = skView
    
    return true
}