Sprite 接触检测在 swift 中不起作用

Question

我创建了一个圆，4种颜色均分，每种颜色是一个节点。然后还有一个节点是一个球从屏幕顶部飞到屏幕中心，当球接触到圆圈时，得1分。我现在面临的问题是接触检测不起作用，这是代码。

我还想知道为 FourColorSquare 中的每个节点设置单独的物理体以检测与每种颜色的碰撞有什么更好的方法？

// move groups outside of class, so that other game scene can use it

let ballGroup:UInt32 = 1 let nodeGroup:UInt32 = 2

class 四色圆：SKShapeNode {

override init() {
    super.init()
    self.createCircle()
}

required init?(coder aDecoder: NSCoder) {
    super.init(coder: aDecoder)
}

func createCircle () {
    let center = CGPointMake(CGRectGetMidX(self.frame), CGRectGetMidY(self.frame))
    // node1
    let node1bezierPath = UIBezierPath()
    node1bezierPath.addArcWithCenter(center, radius: 100, startAngle: 0.78, endAngle: 2.35, clockwise: true)
    node1bezierPath.addLineToPoint(center)

    let node1 = SKShapeNode(path: node1bezierPath.CGPath)
    node1.strokeColor = SKColor.redColor()
    node1.fillColor = SKColor.redColor()
    node1.physicsBody?.categoryBitMask = nodeGroup
    node1.physicsBody?.collisionBitMask = ballGroup
    node1.physicsBody?.contactTestBitMask = ballGroup
    self.addChild(node1)
    // node2
    let node2bezierPath = UIBezierPath()
    node2bezierPath.addArcWithCenter(center, radius: 100, startAngle: 2.35, endAngle: 3.92, clockwise: true)
    node2bezierPath.addLineToPoint(center)

    let node2 = SKShapeNode(path: node2bezierPath.CGPath)
    node2.strokeColor = SKColor.blueColor()
    node2.fillColor = SKColor.blueColor()
    node2.physicsBody?.categoryBitMask = nodeGroup
    node2.physicsBody?.collisionBitMask = ballGroup
    node2.physicsBody?.contactTestBitMask = ballGroup
    self.addChild(node2)
    // node3
    let node3bezierPath = UIBezierPath()
    node3bezierPath.addArcWithCenter(center, radius: 100, startAngle: 3.92, endAngle: 5.48, clockwise: true)
    node3bezierPath.addLineToPoint(center)

    let node3 = SKShapeNode(path: node3bezierPath.CGPath)
    node3.strokeColor = SKColor.greenColor()
    node3.fillColor = SKColor.greenColor()
    node3.physicsBody?.categoryBitMask = nodeGroup
    node3.physicsBody?.collisionBitMask = ballGroup
    node3.physicsBody?.contactTestBitMask = ballGroup
    self.addChild(node3)
    // node4
    let node4bezierPath = UIBezierPath()
    node4bezierPath.addArcWithCenter(center, radius: 100, startAngle: 5.48, endAngle: 0.78, clockwise: true)
    node4bezierPath.addLineToPoint(center)

    let node4 = SKShapeNode(path: node4bezierPath.CGPath)
    node4.strokeColor = SKColor.yellowColor()
    node4.fillColor = SKColor.yellowColor()
    node4.physicsBody?.categoryBitMask = nodeGroup
    node4.physicsBody?.collisionBitMask = ballGroup
    node4.physicsBody?.contactTestBitMask = ballGroup
    self.addChild(node4)

}

func rotate(angle : CGFloat, animated : Bool) {
    var rotateAction : SKAction!

    if animated {
        rotateAction = SKAction.rotateByAngle(angle, duration: 0.6)
    }
    else {
        rotateAction = SKAction.rotateByAngle(angle, duration: 0)
    }

    self.runAction(rotateAction)
}

}

class GameScene: SKScene, SKPhysicsContactDelegate {

var ball = SKShapeNode(circleOfRadius: 10)
var ballColor = ["red", "blue", "green", "yellow"]
let circle = FourColorCircle()

override func didMoveToView(view: SKView) {

    self.physicsWorld.contactDelegate = self


    ball.physicsBody?.dynamic = true
    ball.physicsBody?.categoryBitMask = ballGroup
    ball.physicsBody?.collisionBitMask = nodeGroup
    ball.physicsBody?.contactTestBitMask = nodeGroup

    circle.physicsBody?.categoryBitMask = nodeGroup
    circle.physicsBody?.collisionBitMask = ballGroup
    circle.physicsBody?.contactTestBitMask = ballGroup


    backgroundColor = SKColor.whiteColor()
    circle.position = CGPointMake(CGRectGetMidX(self.frame), CGRectGetMidY(self.frame))
    self.addChild(circle)

    self.addChild(ball)
    ball.position = CGPointMake(150, 0)
    println("Initial Ball Pos:   \(ball.position)")

}

override func touchesBegan(touches: Set<NSObject>, withEvent event: UIEvent) {

    rotateCenterCircle()

    setBallPosition()

    setRandomColor()

    ballMove()

    // test ball position

    println("--------------")

    println("Ball Pos:   \(ball.position)")

    println("Circle pos: \(circle.position)")

    println("Midpoint:   \(CGPoint(x:CGRectGetMidX(self.frame), y:CGRectGetMidY(self.frame) + self.frame.size.width))")

    println("--------------")

    // super.touchesBegan(touches as Set<NSObject> , withEvent:event)

}



override func update(currentTime: CFTimeInterval) {
    /* Called before each frame is rendered */
}

func rotateCenterCircle() {

    circle.position = CGPointMake(CGRectGetMidX(self.frame), CGRectGetMidY(self.frame))
    circle.rotate(-3.14/2, animated: true)

}

func ballMove() {
    let ballMovement = SKAction.moveTo(CGPoint(x: CGRectGetMidX(self.frame), y: CGRectGetMidY(self.frame)), duration: 3)
    ball.runAction(ballMovement)
}

func setRandomColor() {
    ball.strokeColor = SKColor.whiteColor()
    ball.zPosition = 10


    let ballColorIndex = Int(arc4random_uniform(UInt32(ballColor.count)))
    switch(ballColorIndex) {
    case 0:
        ball.fillColor = SKColor.redColor()
    case 1:
        ball.fillColor = SKColor.blueColor()
    case 2:
        ball.fillColor = SKColor.greenColor()
    case 3:
        ball.fillColor = SKColor.yellowColor()
    default:
        println("Unexpected random index value ", ballColorIndex)
    }
}

func setBallPosition() {

    ball.position = CGPoint(x:CGRectGetMidX(self.frame), y:CGRectGetMidY(self.frame) + (self.frame.size.width / 2))

    println("ball position = \(ball.position)")
}

func didBeginContact(contact: SKPhysicsContact) {

    if contact.bodyA.categoryBitMask == nodeGroup || contact.bodyB.categoryBitMask == nodeGroup {

        println("contact")

    }

}

}

所以当两个精灵相互接触时，控制台没有打印日志。

Answer 1

在为节点的物理体设置属性之前，您首先需要创建一个。有基于体积的物体，例如圆形或矩形，也有基于边的物理物体，这些物体是从路径创建的。

鉴于您当前正在使用球，您将使用基于体积的物体，例如 init(circleOfRadius:) 或 init(circleOfRadius:center:)。最好在继续之前阅读 SKPhysicsBody class 参考资料。

Sprite 接触检测在 swift 中不起作用

Sprite contact detection not working in swift

ios

sprite-kit

swift