如何精确检测何时触摸SKShapeNode？

Question

I'm working with Swift and SpriteKit.

I have the following situation :

Here, each of the "triangles" is a SKShapenode. My problem is that I would like to detect when someone touches the screen which triangle is being touched. I assume that the hitbox of all these triangles are rectangles so my function returns me all the hitboxes touched while I only want to know which one is actually touched.

Is there any way to have a hitbox that perfectly match the shape instead of a rectangle ?

Here's my current code :

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

You could try to use CGPathContainsPoint with a SKShapeNode instead of nodesAtPoint , which is more appropriate:

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

This would be the easiest way of doing it.

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

The way I do this with Swift 4:

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 //...
        }
    }

}