如何精确检测何时触摸 SKShapeNode？

Question

我正在使用 Swift 和 SpriteKit。

我有以下情况:

这里，每个"triangles"都是一个SKShapenode。我的问题是，我想检测何时有人触摸了正在触摸哪个三角形的屏幕。我假设所有这些三角形的碰撞箱都是矩形，所以我的函数 returns 我接触了所有碰撞箱，而我只想知道实际接触了哪个碰撞箱。

有什么方法可以让碰撞箱与形状完美匹配，而不是矩形？

这是我当前的代码：

override func touchesBegan(touches: Set<UITouch>, withEvent event: UIEvent?)
{
    let touch = touches.first
    let touchPosition = touch!.locationInNode(self)
    let touchedNodes = self.nodesAtPoint(touchPosition)

    print(touchedNodes) //this should return only one "triangle" named node

    for touchedNode in touchedNodes
    {
        if let name = touchedNode.name
        {
            if name == "triangle"
            {
                let triangle = touchedNode as! SKShapeNode
                // stuff here
            }
        }
    }
}

Answer 1

您可以尝试使用 CGPathContainsPoint 和 SKShapeNode 而不是 nodesAtPoint，后者更合适：

override func touchesBegan(touches: Set<UITouch>, withEvent event: UIEvent?)
{
    let touch = touches.first
    let touchPosition = touch!.locationInNode(self)
    self.enumerateChildNodesWithName("triangle") { node, _ in
        // do something with node
        if node is SKShapeNode {
            if let p = (node as! SKShapeNode).path {
                if CGPathContainsPoint(p, nil, touchPosition, false) {
                    print("you have touched triangle: \(node.name)")
                    let triangle = node as! SKShapeNode
                    // stuff here
                }
            }
        }
    }
}

Answer 2

这是最简单的方法。

override func touchesBegan(touches: Set<UITouch>, withEvent event: UIEvent?)
{
    for touch in touches {
        let location = touch.locationInNode(self)
        if theSpriteNode.containsPoint(location) {
             //Do Whatever    
        }
    }
}

Answer 3

我使用 Swift 4 的方式：

override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {
    guard let touch = touches.first else { 
     return 
    }
    let touchPosition = touch.location(in: self)
    let touchedNodes = nodes(at: touchPosition)
    for node in touchedNodes {
        if let mynode = node as? SKShapeNode, node.name == "triangle" {
            //stuff here
            mynode.fillColor = .orange //...
        }
    }

}

如何精确检测何时触摸 SKShapeNode？

How to detect precisely when a SKShapeNode is touched?

shape

ios

sprite-kit

skshapenode

swift