如何使用该节点的自定义类检测在单独场景中创建的 skspritenode 上的触摸

Question

所以基本上我有一个名为tree的节点，我在.sks文件中设计了它。

我为 skspritenode 添加了一个自定义类，但自定义类似乎不会影响节点。

我正在尝试检测节点及其子节点上的触摸。

这个节点正在使用removefromparent()和addchild()函数转移到多个场景，因此我尝试使用自定义节点类来执行此操作，而不是在每个场景上编写重复的代码来检测触摸......任何帮助将不胜感激。

请注意，我有带有纹理的 super.init 函数，因为它是必要的，但我想使用场景中已经创建的节点。

我的课程代码

import SpriteKit
class tree: SKSpriteNode {
    init() {
        let texture = SKTexture(imageNamed: "tree")
        super.init(texture: texture, color: SKColor.clear, size: texture.size())
        self.isUserInteractionEnabled = true
    }
    required init?(coder aDecoder: NSCoder) {
        super.init(coder: aDecoder)
    }
    override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {
        for touch in touches {
            print("touched!")
        }
    }

}

Answer 1

这个答案中有一个很好的解释，应该清楚你对 SKS 文件和子类化的想法。关于您的代码，使用大写字母作为类名是一个好习惯，在您的情况下，我更喜欢使用 class Tree 而不是类树。关于第二个问题，您可以使用 userData 将对象从一个场景传输到另一个场景，如下文在我的示例中解释的那样：

import SpriteKit
class GameScene: SKScene {
    private var label : SKLabelNode?
    var tree : Tree!
    override func didMove(to view: SKView) {
        self.label = self.childNode(withName: "//helloLabel") as? SKLabelNode
        if let label = self.label {
            label.alpha = 0.0
            label.run(SKAction.fadeIn(withDuration: 2.0))
        }
        self.isUserInteractionEnabled = true
        tree = Tree()
        tree.name = "tree"
        addChild(tree)
        tree.position = CGPoint(x:self.frame.midX,y:self.frame.midY)
    }
    override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {
        for touch: AnyObject in touches {
            let pointOfTouch = touch.location(in: self)
            let nodeUserTapped = atPoint(pointOfTouch)
            if nodeUserTapped.name == "tree" {
                tree.removeFromParent()
                let sceneToMoveTo = Scene2.init(size: self.size)
                sceneToMoveTo.userData = NSMutableDictionary()
                sceneToMoveTo.userData?.setObject(tree, forKey: "tree" as NSCopying)
                let gameTransition = SKTransition.fade(withDuration: 0.5)
                self.view!.presentScene(sceneToMoveTo, transition: gameTransition)
            }
        }
    }
}
class Scene2: SKScene {
    var tree:Tree!
    override func didMove(to view: SKView) {
        print("This is the scene: (type(of:self))")
        guard let previousValue = self.userData?.value(forKey: "tree") else { return }
        if previousValue is Tree {
            tree = previousValue as! Tree
            addChild(tree)
            tree.position = CGPoint(x:self.frame.midX,y:self.frame.midY)
        }
    }
    override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {
        for touch: AnyObject in touches {
            let pointOfTouch = touch.location(in: self)
            let nodeUserTapped = atPoint(pointOfTouch)
            if nodeUserTapped.name == "tree" {
                tree.removeFromParent()
                if let sceneToMoveTo = SKScene(fileNamed: "GameScene") {
                    sceneToMoveTo.scaleMode = .aspectFill
                    sceneToMoveTo.userData = NSMutableDictionary()
                    sceneToMoveTo.userData?.setObject(tree, forKey: "tree" as NSCopying)
                    let gameTransition = SKTransition.fade(withDuration: 0.5)
                    self.view!.presentScene(sceneToMoveTo, transition: gameTransition)
                }
            }
        }
    }
}

正如您所读到的，我在父类和节点中都有触摸控制，这可以通过将自定义SKSpriteNode的touchesBegan方法更改为

：

override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {
    for touch in touches {
        print("touched!")
    }
    guard let parent = self.parent else { return }
    parent.touchesBegan(touches, with: event)
}

请记住，如果要使用此方法，也应将此方法扩展到其他触摸方法。