碰撞测试在 SpriteKit Swift 2 中不起作用

Question

我一直在试图弄清楚为什么我的 didBeginContact 方法不起作用。我有一个三角形从屏幕顶部落到底部，底部有一条线，如果它与它发生碰撞。我的分数应该增加。 这是负责此操作的代码。

func createScene(){

    physicsWorld.contactDelegate = self

    slider = SKSpriteNode(imageNamed: "Slider")
    slider.setScale(0.20)
    slider.position = CGPoint(x: self.frame.width / 2, y: 0 + slider.frame.height / 2)


    slider.physicsBody = SKPhysicsBody(rectangleOfSize: slider.size)
    slider.physicsBody?.categoryBitMask = PhysicsCatergory.slider
    slider.physicsBody?.collisionBitMask = PhysicsCatergory.coin | PhysicsCatergory.greenTriangle | PhysicsCatergory.orangeHexagon | PhysicsCatergory.purpleOctagon | PhysicsCatergory.redSquare
    slider.physicsBody?.contactTestBitMask = PhysicsCatergory.coin | PhysicsCatergory.greenTriangle | PhysicsCatergory.orangeHexagon | PhysicsCatergory.purpleOctagon | PhysicsCatergory.redSquare
    slider.physicsBody?.affectedByGravity = false
    slider.physicsBody?.dynamic = false

    var timer = NSTimer.scheduledTimerWithTimeInterval(1.0, target: self, selector: Selector("SpawnShapes"), userInfo: nil, repeats: true)
    self.addChild(slider)


}

func didBeginContact(contact: SKPhysicsContact) {
    let firstBody = contact.bodyA
    let secondBody = contact.bodyB

    if firstBody.categoryBitMask == PhysicsCatergory.greenTriangle && secondBody.categoryBitMask == PhysicsCatergory.Score{
        score++
        print(score)

    }
    else if firstBody.categoryBitMask == PhysicsCatergory.Score && secondBody.categoryBitMask == PhysicsCatergory.greenTriangle{
        score++
        print(score)
    }



}

override func didMoveToView(view: SKView) {

        createScene()
    invisibleBounderies()


}

func invisibleBounderies(){

    let scoreNode = SKSpriteNode()
    scoreNode.size = CGSize(width: 5, height: 600)
    scoreNode.position = CGPoint(x: self.frame.width / 2, y: self.frame.height / 10)
    scoreNode.physicsBody = SKPhysicsBody(rectangleOfSize: scoreNode.size)
    scoreNode.physicsBody?.affectedByGravity = false
    scoreNode.physicsBody?.dynamic = false
    scoreNode.physicsBody?.categoryBitMask = PhysicsCatergory.Score
    scoreNode.physicsBody?.collisionBitMask = PhysicsCatergory.greenTriangle
    scoreNode.physicsBody?.contactTestBitMask = PhysicsCatergory.greenTriangle
    scoreNode.zRotation = CGFloat(M_PI/2.0)
    scoreNode.color = SKColor.blueColor()


    self.addChild(scoreNode)



}



func SpawnShapes(){

    greenTriangle = SKSpriteNode(imageNamed:"greenTriangle")
    purpleOctagon = SKSpriteNode(imageNamed: "purpleOctagon")
    redSquare = SKSpriteNode(imageNamed: "redSquare")
    coin = SKSpriteNode(imageNamed: "coin")

    greenTriangle.physicsBody = SKPhysicsBody(rectangleOfSize: greenTriangle.size)
    greenTriangle.physicsBody?.categoryBitMask = 0
    greenTriangle.physicsBody?.collisionBitMask = PhysicsCatergory.Score
    greenTriangle.physicsBody?.contactTestBitMask = PhysicsCatergory.Score
    greenTriangle.physicsBody?.affectedByGravity = false
    greenTriangle.physicsBody?.dynamic = false

    var MinValue = self.size.width / 8
    var MaxValue = self.size.width - 150
    var SpawnPoint = UInt32(MaxValue - MinValue)

    let action = SKAction.moveToY(-30, duration: 2.0)


    slider.zPosition = 1
    coin.zPosition = 2
    greenTriangle.zPosition = 3
    orangeHexagon.zPosition = 4
    purpleOctagon.zPosition = 5
    redSquare.zPosition = 6



    greenTriangle.position = CGPoint(x: CGFloat(arc4random_uniform(SpawnPoint)), y: self.size.height)
    self.addChild(greenTriangle)
    greenTriangle.runAction(SKAction.repeatActionForever(action))



}

Answer 1

• 您只需将greenTriangle dynamic 属性设置为true。
• 你设置了greenTriangle.physicsBody?.categoryBitMask = 0，这就是你没有检测到接触的原因。 greenTriangle.physicsBody?.categoryBitMask = PhysicsCatergory.greenTriangle 可能会成功。

如果您在进行这些更改后仍未检测到联系人，请检查您的 physicsCatergory 是否正常。如果您愿意，最好实现 UInt32 类型的 enum，其中值都是单个位，或者像这样：

enum PhysicsCatergory : UInt32{
    case slider = 1
    case coin = 2
    case greenTriangle = 4
    case purpleOctagon = 8
    case redSquare = 16
    case orangeHexagon = 32
    case Score = 64
}

这样做需要在对这些枚举之一的每个引用中添加.rawValue。示例：greenTriangle.physicsBody?.categoryBitMask = PhysicsCatergory.greenTriangle.rawValue

我知道这与问题无关，但我建议您不要在这种情况下使用 SKAction 进行移动，因为它会忽略物理碰撞，因为您正在“强制”它的位置。请改用physicsBody.velocity 属性来让物理工作。您会注意到，当使用后者时，该块将与得分线发生碰撞，因为您还设置了它的collisionBitMask。这样你就可以正确控制它的碰撞。如果不希望方块在行进时失去速度（空气摩擦），请将physicsBody.linearDamping 设置为零。

Answer 2

具有dynamic 属性false 的physicsBody 不能参与碰撞；将dynamic 设置为 true.