Ios Spritkit：使用手指绘制线条时检测碰撞

我正在尝试检测

现有线路

和用户

当前使用手指绘制的线路之间的碰撞
触点

这是我的密码：

let padding: CGFloat = 100
override func didMove(to view: SKView) {

    physicsWorld.contactDelegate = self

    let startPoint1 = CGPoint(x: self.frame.minX + padding , y: self.frame.minY + padding)
    let leftHorizontalPoint = CGPoint(x: self.frame.minX + padding, y: self.frame.maxY - padding)

    let line1 = SKShapeNode()
    let line_path:CGMutablePath = CGMutablePath()
    line_path.move(to: startPoint1)
    line_path.addLine(to: leftHorizontalPoint)
    line1.path = line_path
    line1.lineWidth = 3
    line1.strokeColor = UIColor.white
    addChild(line1)

    line1.physicsBody = SKPhysicsBody(edgeLoopFrom: line1.frame)
    line1.physicsBody?.isDynamic = true
    line1.physicsBody?.categoryBitMask = PhysicsCategory.solidLine
    line1.physicsBody?.collisionBitMask = PhysicsCategory.currentLine
    line1.physicsBody?.contactTestBitMask = PhysicsCategory.currentLine
}

然后在touchBegin、touchMove和touchEnd上，我有以下代码：

var currentLineNode: SKShapeNode!
var startPoint: CGPoint = CGPoint.zero
func touchDown(atPoint pos : CGPoint) {
    startPoint = pos
}

func touchMoved(toPoint pos : CGPoint) {
    if currentLineNode != nil {
        currentLineNode.removeFromParent()
    }
    currentLineNode = SKShapeNode()
    currentLineNode.zPosition = 1
    let line_path:CGMutablePath = CGMutablePath()
    line_path.move(to: startPoint)
    line_path.addLine(to: pos)
    currentLineNode.path = line_path
    currentLineNode.lineWidth = 3
    currentLineNode.strokeColor = UIColor.red
    addChild(currentLineNode)

    currentLineNode.physicsBody = SKPhysicsBody(edgeLoopFrom: currentLineNode.frame)
    currentLineNode.physicsBody?.isDynamic = true
    currentLineNode.physicsBody?.categoryBitMask = PhysicsCategory.currentLine
    currentLineNode.physicsBody?.collisionBitMask = PhysicsCategory.solidLine
    currentLineNode.physicsBody?.contactTestBitMask = PhysicsCategory.solidLine
}

func touchUp(atPoint pos : CGPoint) {
    if currentLineNode != nil {
        currentLineNode.removeFromParent()
    }
    currentLineNode = SKShapeNode()
    let line_path:CGMutablePath = CGMutablePath()
    line_path.move(to: startPoint)
    line_path.addLine(to: pos)
    currentLineNode.path = line_path
    currentLineNode.lineWidth = 3
    currentLineNode.strokeColor = UIColor.red
    addChild(currentLineNode)

    currentLineNode.physicsBody = SKPhysicsBody(edgeLoopFrom: currentLineNode.frame)
    currentLineNode.physicsBody?.isDynamic = true
    currentLineNode.physicsBody?.categoryBitMask = PhysicsCategory.currentLine
    currentLineNode.physicsBody?.collisionBitMask = PhysicsCategory.solidLine
    currentLineNode.physicsBody?.contactTestBitMask = PhysicsCategory.solidLine
}

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

    for t in touches { self.touchDown(atPoint: t.location(in: self)) }
}

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

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

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

这是我的输出，即使从白色线条经过，也不会检测到碰撞


有什么不对劲吗？任何关于这方面的建议都会很有帮助。
您使用的是两个基于边缘的实体。基于边的实体将始终为
isDynamic=false
，无论是否设置它。您至少需要一个基于卷的主体才能执行接触

此外，您还不断地删除和添加节点，这是一个糟糕的想法

我建议您只在touchsbegind上添加节点，然后只更新touchsmoved上的路径
您正在创建带有边循环的物理体。苹果将边循环定义为

边没有体积或质量，并且始终将其视为isDynamic特性等于false。边只能与基于体积的物理体碰撞

把你的物理身体改成这样行得通

currentLineNode.physicsBody = SKPhysicsBody(rectangleOf: currentLineNode.frame.size, center: CGPoint(x: startPoint.x + currentLineNode.frame.size.width / 2, y: startPoint.y + currentLineNode.frame.size.height / 2)) 

还应该注意的是，在TouchSended中更改物理体是多余的，不会增加任何内容。我把它从touchesEnded上取下来了，它工作得很好
该死，比我快
currentLineNode.physicsBody = SKPhysicsBody(rectangleOf: currentLineNode.frame.size, center: CGPoint(x: startPoint.x + currentLineNode.frame.size.width / 2, y: startPoint.y + currentLineNode.frame.size.height / 2))