解雇SKScene回到UIKit菜单

Question

一旦我的SpriteKit游戏结束,我想回到我的UIKit MenuViewController.从我到目前为止所学到的,使用protocol/delegate是最好的(？)选项,但我无法让它工作.我知道协议可能会超出类声明GameViewController,看起来像:

protocol GameViewControllerDelegate {
    var gameOver: Bool?
}

但我需要帮助从GameSceneAND获取它解雇GameViewController.以下是应用程序的骨骼,如果有帮助的话.

MenuViewController

class MenuViewController: UIViewController {

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

    @IBAction func goToGame(_ sender: UIButton) {
        performSegue(withIdentifier: "toGameSegue", sender: sender.currentTitle)
    }

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

GameViewController

class GameViewController: UIViewController {

    var numberOfPlayers: String?

    override func viewDidLoad() {
        super.viewDidLoad()

        if let view = self.view as! SKView? {
            if let scene = SKScene(fileNamed: "GameScene") {
                scene.scaleMode = .aspectFill

                scene.userData = NSMutableDictionary()
                scene.userData?.setObject(numberOfPlayers!, forKey: "numberOfPlayers" as NSCopying)

                view.presentScene(scene)
            }
        }
    }
...

GameScene

class GameScene: SKScene {

    var howManyPlayers: String?

    override func didMove(to view: SKView) {

        if let numPlayers = self.userData?.value(forKey: "numberOfPlayers") {
            howManyPlayers = numPlayers as? String
        }

        print(howManyPlayers!)

    }
...

这个SpriteKit游戏有一个MenuViewController,一个GameViewController和一个GameScene.当您从MenuViewController按下按钮时,数据将通过segue发送到GameViewController.在GameViewController呈现GameScene之前,它将数据存储在scene的userData变量中,以便GameScene可以访问它.在这个例子中,它是玩家的数量.

Answer 1

我同意 Whirwind 的评论：当你只能使用一个 viewController 来完成所有游戏时，为什么要混合两个不同的框架并使你的生活变得复杂？

不管怎样，根据你的故事板截图，有 2 个 viewController，只有按下按钮GameScene你才能转到第二个 viewController （以及）。

有两件事要做：取消分配当前的 SKScene （在您的情况下为GameScene）并呈现“初始视图控制器”或您的MenuViewController.

为此，我使用“Hello world” Sprite-kit 模板和协议/委托方法来扩展SKSceneDelegate 该类。正如您所看到的，我们可以关闭场景（呈现 nil）并调用外部方法来GameViewController呈现MainViewController

为了确保这两个操作都能成功，我还使用两个操作print来进行调试：

游戏视图控制器：

import UIKit
import SpriteKit
class GameViewController: UIViewController,TransitionDelegate {
    override func viewDidLoad() {
        super.viewDidLoad()
        if let view = self.view as! SKView? {
            if let scene = SKScene(fileNamed: "GameScene") {
                scene.scaleMode = .aspectFill
                scene.delegate = self as TransitionDelegate
                view.presentScene(scene)
            }
            view.ignoresSiblingOrder = true
            view.showsFPS = true
            view.showsNodeCount = true
        }
    }
    func returnToMainMenu(){
        let appDelegate = UIApplication.shared.delegate as! AppDelegate
        guard  let storyboard = appDelegate.window?.rootViewController?.storyboard else { return }
        if let vc = storyboard.instantiateInitialViewController() {
            print("go to main menu")
            self.present(vc, animated: true, completion: nil)
        }
    }
}

游戏场景：

import SpriteKit
protocol TransitionDelegate: SKSceneDelegate {
    func returnToMainMenu()
}
class GameScene: SKScene {
    override func didMove(to view: SKView) {
        self.run(SKAction.wait(forDuration: 2),completion:{[unowned self] in
            guard let delegate = self.delegate else { return }
            self.view?.presentScene(nil)
            (delegate as! TransitionDelegate).returnToMainMenu()
        })
    }
    deinit {
        print("\n THE SCENE \((type(of: self))) WAS REMOVED FROM MEMORY (DEINIT) \n")
    }
}

输出：