1

我注意到这个问题已经发生在很多人身上。我确保self.physicsWorld.contactDelegate = self 在 didMove 函数中有,但它仍然不起作用。这是我的代码:

class PoolTableScene: SKScene, SKPhysicsContactDelegate {

  struct PhysicsCatagory {

    static let None : UInt32 = 0 //0
    static let OrangeBall : UInt32 = 0b1 //1
    static let BlueBall : UInt32 = 0b10 //2
    static let PokeBall : UInt32 = 0b100 //3
    static let Border : UInt32 = 0b1000 //4
    static let All : UInt32 = UInt32.max

  }


  let ballPoke = SKSpriteNode(imageNamed:"pokeBall")
  let ballBlue = SKSpriteNode(imageNamed:"blueBall")
  let ballOrange = SKSpriteNode(imageNamed: "orangeBall")
  //var lastTouch: CGPoint? = nil


  override func didMove(to view: SKView) {

    self.physicsWorld.contactDelegate = self

    self.physicsWorld.gravity = CGVector(dx: 0, dy: -9.8)

    //used to set gravity


    //creates body for sprite that will lock the objects to a specific area
    let sceneBody = SKPhysicsBody(edgeLoopFrom: self.frame)
    sceneBody.friction = 0 //This will make the ball bounce naturally off the edges of the scenBody
    self.physicsBody = sceneBody // make physics only affect whats in sceneBody - NEED PHYSICS BODY UNLESS IT WON'T BE AFFECTED BY PHYSICS
    self.physicsBody?.categoryBitMask = PhysicsCatagory.Border
    self.physicsBody?.collisionBitMask = PhysicsCatagory.BlueBall | PhysicsCatagory.OrangeBall | PhysicsCatagory.PokeBall
    self.physicsBody?.contactTestBitMask = PhysicsCatagory.None

    ballPoke.name = "ballPoke"
    ballPoke.size = CGSize(width: 50, height: 50)
    ballPoke.anchorPoint = CGPoint(x:0.5, y:0.5)
    ballPoke.position = CGPoint(x: self.frame.size.width*0.25, y:self.frame.size.height/2)
    ballPoke.zPosition = 100
    ballPoke.physicsBody = SKPhysicsBody(circleOfRadius: 25)//need this so the ball can be affected by physics
    ballPoke.physicsBody?.affectedByGravity = true //ball will be affected by gravity determined by the scene's physics
    ballPoke.physicsBody?.restitution = 1 // sets bounciness of ball
    ballPoke.physicsBody?.linearDamping = 0 //used to set how air resistence will affect ball
    ballPoke.physicsBody?.categoryBitMask = PhysicsCatagory.PokeBall
    ballPoke.physicsBody?.collisionBitMask = PhysicsCatagory.BlueBall | PhysicsCatagory.Border
    ballPoke.physicsBody?.contactTestBitMask = PhysicsCatagory.OrangeBall

    self.addChild(ballPoke)


    ballBlue.name = "ballBlue"
    ballBlue.size = CGSize(width: 50, height: 50)
    ballBlue.anchorPoint = CGPoint(x:0.5, y:0.5)
    ballBlue.position = CGPoint(x: self.frame.size.width*0.50, y:self.frame.size.height/3)
    ballBlue.zPosition = 100
    ballBlue.physicsBody = SKPhysicsBody(circleOfRadius: 25)//need this so the ball can be affected by physics
    ballBlue.physicsBody?.affectedByGravity = true //ball will be affected by gravity determined by the scene's physics
    ballBlue.physicsBody?.restitution = 1 // sets bounciness of ball
    ballBlue.physicsBody?.linearDamping = 0 //used to set how air resistence will affect ball
    ballBlue.physicsBody?.categoryBitMask = PhysicsCatagory.BlueBall
    ballBlue.physicsBody?.collisionBitMask = PhysicsCatagory.OrangeBall | PhysicsCatagory.PokeBall | PhysicsCatagory.Border
    ballBlue.physicsBody?.contactTestBitMask = PhysicsCatagory.None

    self.addChild(ballBlue)

    ballOrange.name = "ballOrange"
    ballOrange.size = CGSize(width: 50, height: 50)
    ballOrange.anchorPoint = CGPoint(x:0.5, y:0.5)
    ballOrange.position = CGPoint(x: self.frame.size.width*0.75, y:self.frame.size.height/2)
    ballOrange.zPosition = 100
    ballOrange.physicsBody = SKPhysicsBody(circleOfRadius: 25)//need this so the ball can be affected by physics
    ballOrange.physicsBody?.affectedByGravity = true //ball will be affected by gravity determined by the scene's physics
    ballOrange.physicsBody?.restitution = 1 // sets bounciness of ball
    ballOrange.physicsBody?.linearDamping = 0 //used to set how air resistence will affect ball
    ballOrange.physicsBody?.categoryBitMask = PhysicsCatagory.OrangeBall
    ballOrange.physicsBody?.collisionBitMask = PhysicsCatagory.BlueBall | PhysicsCatagory.Border
    ballOrange.physicsBody?.contactTestBitMask = PhysicsCatagory.PokeBall

    self.addChild(ballOrange)

  }

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

    //Finds the position where user touches screen
    for touch: AnyObject in touches {

      let positionOfTouch = touch.location(in: self)

      //drags ball to where user touches screen
      let dragBallAction = SKAction.move(to: CGPoint(x: positionOfTouch.x, y: positionOfTouch.y), duration: 0.5)
      ballOrange.run(dragBallAction)

    }

  }


  func didBeginContact(contact: SKPhysicsContact) {

    print("contact")

    var contactBody1: SKPhysicsBody
    var contactBody2: SKPhysicsBody

    if contact.bodyA.categoryBitMask < contact.bodyB.categoryBitMask {

      contactBody1 = contact.bodyA
      contactBody2 = contact.bodyB
    }
    else// else almost never gets called but still add it to function

    {
      contactBody1 = contact.bodyB
      contactBody2 = contact.bodyA
    }

    //this uses the catagories set up in above struct (1 = Square, 2 = Ball)
    if ((contactBody1.categoryBitMask == 1) && (contactBody2.categoryBitMask == 3)) {

      //if the ball contact the square, remove the ball
      contactBody2.node!.removeFromParent()


    }


  }

}
4

3 回答 3

1

阅读我对这个问题SpriteKit - Making certain SpriteNodes NOT collide without disable their physical bodys的回答,这描述了碰撞和接触之间的区别。

还可以尝试实现我的checkPhysics()功能(来源在同一个答案中),它将分析您的场景并列出哪些节点与哪些其他节点发生冲突,以及哪些节点在联系其他节点时通知。

对于我有 4 个名为 shape_blueSquare、shape_redCircle、shape_purpleSquare、shape_greenRect 和 shape_yellowTriangle 的 SKSPriteNode 以及名为“Screen_edge”的屏幕边框的物理演示,输出将是这样的。

Optional("shape_blueSquare") collides with Optional("Screen_edge")
Optional("shape_blueSquare") collides with Optional("shape_redCircle")
Optional("shape_blueSquare") collides with Optional("shape_purpleSquare")
Optional("shape_blueSquare") collides with Optional("shape_greenRect")
Optional("shape_redCircle") collides with Optional("Screen_edge")
Optional("shape_redCircle") collides with Optional("shape_blueSquare")
Optional("shape_redCircle") notifies when contacting Optional("shape_purpleSquare")
Optional("shape_redCircle") collides with Optional("shape_greenRect")
Optional("shape_redCircle") notifies when contacting Optional("shape_greenRect")
Optional("shape_purpleSquare") collides with Optional("Screen_edge")
Optional("shape_purpleSquare") collides with Optional("shape_greenRect")
Category for Optional("shape_greenRect") does not appear to be set correctly as 4294967295
ptional("shape_greenRect") collides with Optional("Screen_edge")
Optional("shape_yellowTriangle") collides with Optional("Screen_edge")
Optional("shape_yellowTriangle") notifies when contacting Optional("shape_redCircle")
Optional("shape_yellowTriangle") collides with Optional("shape_greenRect")
Optional("shape_yellowTriangle") notifies when contacting Optional("shape_greenRect")
于 2016-09-21T08:40:05.117 回答
1

我遇到了同样的问题,因为我不太熟悉 ContactA 和 ContactB 的工作原理,所以我给每个对象起了一个名字,并检查这两个对象是否像这样碰撞。

func didMoveToView(view: SKView) {

       objectA = self.childNodeWithName("ObjectA") as! SKSpriteNode!
       objectB = self.childNodeWithName("ObjectB") as! SKSpriteNode!
}

 func didBeginContact(contact: SKPhysicsContact) {

        let contactA: SKPhysicsBody = contact.bodyA
        let contactB: SKPhysicsBody = contact.bodyB

        let nodeA = contactA.node as! SKSpriteNode
        let nodeB = contactB.node as! SKSpriteNode

        if nodeA.name == "ObjectA" && nodeB.name == "ObjectB" {

               //do something
        }

    }
于 2016-09-21T02:35:36.883 回答
0

检测碰撞的属性是接触测试位掩码,这就是为什么它刚刚通过我认为你有碰撞位掩码和接触测试位掩码相互混淆

接触测试是检测接触,而碰撞位掩码允许身体相互穿过

于 2016-09-21T03:23:16.500 回答