Question

我正在尝试从Spritekit中的家庭场景更改为游戏场景。当我在模拟器中运行它时，没有过渡到GameScene。我还添加了一个打印命令，以查看是否已注册了播放按钮上的触摸，而没有注册。这是代码。谢谢！

import SpriteKit

class HomeScene: SKScene {

    var playButton: SKSpriteNode?
    var gameScene: SKScene!

override func didMove(to view: SKView) {
    playButton = self.childNode(withName: "startButton") as? SKSpriteNode

}

override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {
    if let touch = touches.first {
        let pos = touch.location(in: self)
        let node = self.atPoint(pos)

        if node == playButton {
            let transition = SKTransition.fade(withDuration: 1)
            gameScene = SKScene(fileNamed: "GameScene")
            gameScene.scaleMode = .aspectFit
            self.view?.presentScene(gameScene, transition: transition)
            print("touch")
        }

    }
}

}

Answer 1

touches方法内的touchesBegan(_: with:)参数的类型为Set<UITouch>，即一组触摸。如Apple Documentation for Sets中所述，当集合中各项的顺序无关紧要时，将使用一个集合。因此，您不能假定touches中的第一项是集合中的第一触摸。知道这一点后，我建议将HomeScene.swift内部的代码重构为以下内容：

import SpriteKit

class HomeScene: SKScene {

    private var playButton: SKSpriteNode?

    override func sceneDidLoad() {
        self.playButton = self.childNode(withName: "//starButton") as? SKSpriteNode
    }

    override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {
        for t in touches {
            self.touchDown(atPoint: t.location(in: self))
        }
    }

    func touchDown(atPoint pos: CGPoint) {
        let nodes = self.nodes(at: pos)

        if let button = playButton {
            if nodes.contains(button) {
                let gameScene = SKScene(fileNamed: "GameScene")
                self.view?.presentScene(gameScene)
        }
    }
}

touchDown(atPoint:)方法完成了所有繁重的工作，并且释放了touchesBegan(_: with:)来监听触摸事件。调用childNode(withName:)时要注意的另一件事：

在文件名之前添加/，开始搜索从文件层次结构的根部开始的节点。
在文件名之前添加//，开始搜索从文件层次结构根目录开始的节点，然后递归向下搜索层次结构。
在文件名之前添加*充当字符通配符，并允许您搜索完全或部分未知的文件名。

Answer 2

我认为您应该使用节点的名称而不是节点本身来进行touchesBe ....的比较...

import SpriteKit

class HomeScene: SKScene {

    var playButton: SKSpriteNode?
    var gameScene: SKScene!

    override func didMove(to view: SKView) {
        playButton = self.childNode(withName: "startButton") as? SKSpriteNode

    }

    override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {
        if let touch = touches.first {
            let pos = touch.location(in: self)
            let node = self.atPoint(pos)

            if node.name == "startButton" {
                let transition = SKTransition.fade(withDuration: 1)
                gameScene = SKScene(fileNamed: "GameScene")
                gameScene.scaleMode = .aspectFit
                self.view?.presentScene(gameScene, transition: transition)
                print("touch")
            }

        }
    }
}

希望有帮助！：）

在Spritekit中更改场景，检测按钮上的触摸

2 个答案: