快速碰撞不起作用.我认为我在didBeginContact中的代码有问题

Question

我一直在开发一款游戏，每当我的测试节点与我的检查节点接触时，都必须执行一次测试。由于这两个节点是唯一将在游戏中检查冲突的节点，我决定使用这种方法来启动我的测试。

问题是，当两个节点物理交叉时，我一直难以使冲突正常工作。

当前代码将移动测试方块，直到它到达检查方块，但现在当它们相遇时，什么都不会发生。

我是不是错过了什么？任何帮助都将不胜感激。谢谢

import SpriteKit
class GameScene: SKScene, SKPhysicsContactDelegate {

var test:SKSpriteNode!
var testTexture = SKTexture(imageNamed: "redsquare.png")
var check:SKSpriteNode!
var checkTexture = SKTexture(imageNamed: "bluesquare.png")
var moving:SKNode!
let testCategory: UInt32 = 1 << 0
let checkCategory: UInt32 = 1 << 2

override func didMoveToView(view: SKView) {
    /* Setup your scene here */
    self.physicsWorld.gravity = CGVectorMake(0.0, 0.0)
    self.physicsWorld.contactDelegate = self
    moving = SKNode()
    self.addChild(moving)
    //create test block
    test = SKSpriteNode(texture: testTexture)
    test.xScale = 0.1
    test.yScale = 0.1
    test.position = CGPointMake(0, self.frame.height - test.size.height)
    test.physicsBody = SKPhysicsBody(rectangleOfSize: test.size)
    test.physicsBody?.dynamic = false
    test.physicsBody?.categoryBitMask = testCategory
    test.physicsBody?.collisionBitMask = checkCategory
    test.physicsBody?.contactTestBitMask = checkCategory
    self.addChild(test)
    //creates check block
    check = SKSpriteNode(texture: checkTexture)
    check.xScale = 0.1
    check.yScale = 0.1
    check.position = CGPointMake(self.frame.width, self.frame.height - check.size.height)
    check.physicsBody = SKPhysicsBody(rectangleOfSize: check.size)
    check.physicsBody?.dynamic = false
    check.physicsBody?.categoryBitMask = checkCategory
    check.physicsBody?.collisionBitMask = testCategory
    check.physicsBody?.contactTestBitMask = testCategory
    self.addChild(check)

    // move action
    let actionMove = SKAction.moveToX(self.frame.width, duration: 1.5)
    let actionMoveDone = SKAction.moveToX(0, duration: 0)
    let moveForever = SKAction.repeatActionForever(SKAction.sequence([actionMove,actionMoveDone]))
    test.runAction(moveForever)

}
override func touchesBegan(touches: NSSet, withEvent event: UIEvent) {
    /* Called when a touch begins */
    for touch: AnyObject in touches {
    }
}
override func update(currentTime: CFTimeInterval) {
    /* Called before each frame is rendered */
}
func didBeginContact(contact: SKPhysicsContact) {
// help here! 
    var firstBody:SKPhysicsBody
    var 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 & testCategory) != 0 && (secondBody.categoryBitMask & checkCategory) != 0){

        println("contact!")
    }

}

}

Answer 1

根据苹果的文档，dynamic属性控制基于体积的物体是否受到重力、摩擦力、与其他物体的碰撞以及直接应用于物体的力或脉冲的影响。

动态属性：默认值为true。如果该值为false，则物理实体将忽略所有作用于它的力和脉冲。在基于边缘的实体；它们自动是静态的。

因此，将dynamic属性设置为true。

node.physicsBody?.dynamic = true

有关详细信息：https://developer.apple.com/library/prerelease/ios/documentation/SpriteKit/Reference/SKPhysicsBody_Ref/index.html#//apple_ref/occ/instp/SKPhysicsBody/