swift - SpriteKit - SpriteNode 从不显示

Question

我正在尝试学习 SpriteKit。我想在代码中向场景添加一个矩形/正方形；但该项目从未显示；

我只想在屏幕上添加一个白色方 block ，但发现它永远不会添加。

在断点处，我注意到 didMove() 似乎从未被调用过。

我做错了什么？

class GameScene: SKScene {

    override func didMove(to view: SKView) {
        let item = SKSpriteNode(color: .white, size: CGSize(width: 150, height: 200))
        item.position = CGPoint(x: self.size.width/2, y: self.size.height/2)
        self.addChild(item)
    }

    override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {

    }

    override func update(_ currentTime: TimeInterval) {
        // Called before each frame is rendered
    }
}

---

更新

我没有更改 xcode 生成的 View Controller

class GameViewController: UIViewController {

    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
                view.presentScene(scene)
            }

            view.ignoresSiblingOrder = true

            view.showsFPS = true
            view.showsNodeCount = true
        }
    }

    override var shouldAutorotate: Bool {
        return true
    }

    override var supportedInterfaceOrientations: UIInterfaceOrientationMask {
        if UIDevice.current.userInterfaceIdiom == .phone {
            return .allButUpsideDown
        } else {
            return .all
        }
    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Release any cached data, images, etc that aren't in use.
    }

    override var prefersStatusBarHidden: Bool {
        return true
    }
}

没有GameScene.sks，我删除了这个文件，因为我不想使用sks文件

Answer 1

如果从未到达 didMove(to view:) 中的断点，那么肯定是您的 ViewController 出于某种原因没有呈现场景。你能打开你的 ViewController 的文件(例如 GameViewController.swift)，看看你那里是否有任何这些行(或任何类似的东西):

let viewSize = UIScreen.main.bounds.size
let scene = GameScene(size: viewSize)
let skView = self.view as! SKView
skView.presentScene(scene)