ios - SpriteKit : Passing variable from GameViewController to GameScene

Question

我在 Storyboard 中创建了一个菜单，它通过 segue 将一些信息传递给 GameViewController。理想情况下，我可以使用该 segue 将信息直接传递到我需要的 GameScene.swift，但我不确定这是一个选项，因为场景只是一个 View 而不是 View Controller 。因此，我将信息传递给 GameViewController，效果很好。但是现在，我如何将它发送到 GameScene.swift？

从菜单转到 GameViewController

func passToGame(game: String) {
        performSegue(withIdentifier: "toGameSegue", sender: game)
    }

    override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
        if let destinationVC = segue.destination as? GameViewController {
            if let item = sender as? String {
                destinationVC.gameInfo = item
            }
        }
    }

游戏 View Controller

    class GameViewController: UIViewController {

        var gameInfo: String? //This works great - now how do I get it to GameScene.swift?

        override func viewDidLoad() {
            super.viewDidLoad()
...

Answer 1

与其他 SKNode 一样，SKScene 有一个名为 userData 的实例属性，你可以使用这个字典来存储你想要的任何东西来呈现场景(这个例子来自“Hello World”Sprite-kit 模板):

class GameViewController: UIViewController {
    var gameInfo: String?
    override func viewDidLoad() {
        super.viewDidLoad()
        if let view = self.view as! SKView? {
            // Load the SKScene from 'GameScene.sks'
            if let scene = SKScene(fileNamed: "GameScene") {
                // Set the scale mode to scale to fit the window
                scene.scaleMode = .aspectFill
                // Present the scene
                scene.userData = NSMutableDictionary()
                scene.userData?.setObject(gameInfo ?? "", forKey: "gameInfo" as NSCopying)
                view.presentScene(scene)
            } 
            ...

要从 GameScene 中检索值，您只需执行以下操作:

override func didMove(to view: SKView) {
    if let gameInfo = self.userData?.value(forKey: "gameInfo") {
                print("gameInfo is :\(gameInfo)")
    }
    ...