spritekit didBeginContact三个对象没有工作

我打算由三个节点[didBeginContact]。 我是在代码下写的。 但是不能正常工作。 当白色的矩形没有击中黑色或白色矩形，println（“黑色”）和println（“蓝色”）工作… whien白色矩形打黑色矩形，println（“蓝色”）工作…

import SpriteKit class GameScene: SKScene, SKPhysicsContactDelegate { let blackCategory: UInt32 = 0x1 << 0 let whiteCategory: UInt32 = 0x1 << 1 let blueCategory: UInt32 = 0x1 << 2 override func didMoveToView(view: SKView) { self.physicsWorld.contactDelegate = self self.size = view.bounds.size self.physicsBody = SKPhysicsBody(edgeLoopFromRect: self.frame) self.physicsWorld.gravity = CGVectorMake(0.0, -3.0) let blackSquare = SKSpriteNode(color: UIColor.blackColor(), size: CGSizeMake(50, 50)) blackSquare.position = CGPoint( x: CGRectGetMidX(self.frame), y: CGRectGetMidY(self.frame) ) blackSquare.physicsBody = SKPhysicsBody(rectangleOfSize: CGSizeMake(50, 50)) blackSquare.physicsBody?.affectedByGravity = false blackSquare.physicsBody?.dynamic = false blackSquare.physicsBody?.categoryBitMask = blackCategory blackSquare.physicsBody?.contactTestBitMask = whiteCategory let blueSquare = SKSpriteNode(color: UIColor.blueColor(), size: CGSizeMake(50, 50)) blueSquare.position = CGPoint( x: CGRectGetMidX(self.frame) - 100, y: CGRectGetMidY(self.frame) - 100 ) blueSquare.physicsBody = SKPhysicsBody(rectangleOfSize: CGSizeMake(50, 50)) blueSquare.physicsBody?.affectedByGravity = false blueSquare.physicsBody?.dynamic = false blackSquare.physicsBody?.categoryBitMask = blueCategory blackSquare.physicsBody?.contactTestBitMask = whiteCategory self.addChild(blackSquare) self.addChild(blueSquare) } override func touchesBegan(touches: NSSet, withEvent event: UIEvent) { for touch in touches { let location = touch.locationInNode(self) let whiteRectangle = SKSpriteNode(color: UIColor.whiteColor(), size: CGSizeMake(50, 50)) whiteRectangle.position = location whiteRectangle.physicsBody = SKPhysicsBody(rectangleOfSize: CGSizeMake(50, 50)) whiteRectangle.physicsBody?.categoryBitMask = whiteCategory whiteRectangle.physicsBody?.contactTestBitMask = blackCategory whiteRectangle.physicsBody?.contactTestBitMask = blueCategory self.addChild(whiteRectangle) } } override func update(currentTime: CFTimeInterval) { } func didBeginContact(contact: SKPhysicsContact!) { var firstBody, secondBody, thirdBody: SKPhysicsBody if contact.bodyA.categoryBitMask < contact.bodyB.categoryBitMask { firstBody = contact.bodyA secondBody = contact.bodyB thirdBody = contact.bodyB } else { firstBody = contact.bodyB secondBody = contact.bodyA thirdBody = contact.bodyA } if firstBody.categoryBitMask & whiteCategory != 0 && secondBody.categoryBitMask & blackCategory != 0 { //secondBody.node?.removeFromParent() println("black") } if firstBody.categoryBitMask & whiteCategory != 0 && thirdBody.categoryBitMask & blueCategory != 0 { //secondBody.node?.removeFromParent() println("blue") } } } 

Answer 1

1）根据你的联系人处理程序，你应该设置类别

  let whiteCategory: UInt32 = 0x1 << 0 let blackCategory: UInt32 = 0x1 << 1 let blueCategory: UInt32 = 0x1 << 2 

2）您错误地设置了blackSquare的physicsBody的位掩码两次

  blackSquare.physicsBody?.categoryBitMask = blueCategory blackSquare.physicsBody?.contactTestBitMask = whiteCategory 

以上应该是

  blueSquare.physicsBody?.categoryBitMask = blueCategory blueSquare.physicsBody?.contactTestBitMask = whiteCategory 

3）这里不需要第三个接触体。

 func didBeginContact(contact: SKPhysicsContact!) { var firstBody, secondBody: SKPhysicsBody if contact.bodyA.categoryBitMask < contact.bodyB.categoryBitMask { firstBody = contact.bodyA secondBody = contact.bodyB } else { firstBody = contact.bodyB secondBody = contact.bodyA } if ((firstBody.categoryBitMask & whiteCategory) != 0 && (secondBody.categoryBitMask & blackCategory != 0)) { //secondBody.node?.removeFromParent() println("black") } if ((firstBody.categoryBitMask & whiteCategory != 0) && (secondBody.categoryBitMask & blueCategory != 0)) { //secondBody.node?.removeFromParent() println("blue") } } 

4）以下是不需要的（在touchesBegan）。 设置蓝色和黑色节点的联系位掩码就足够了。

  whiteRectangle.physicsBody?.contactTestBitMask = blackCategory whiteRectangle.physicsBody?.contactTestBitMask = blueCategory