无法检测到spritekit物理碰撞

Question

我有4个物理体，它们都很好地检测到碰撞。然而，有两个物理体不会检测到它们何时相互碰撞。不过，它们会检测到它们何时与其他物理体碰撞。我有所有这些物理体的联系人测试位掩码，所以我不明白为什么会有问题。以下是一些代码：这是我设置物理体的地方：

    struct PhysicsCategory{
    static let None     : UInt32 = 0
    static let All      : UInt32 = UInt32.max
    static let player   : UInt32 = 0b1
    static let bounce   : UInt32 = 0b10
    static let blueball : UInt32 = 0b100
    static let redball  : UInt32 = 0b1000
    static let coin     : UInt32 = 0b10000
}

以下是我用于设置玩家物理体（其中一个问题物理体）的代码：

     player.physicsBody = SKPhysicsBody(rectangleOf: CGSize(width: player.size.width-40, height: player.size.height-40))
    player.physicsBody?.isDynamic = true
    player.physicsBody?.categoryBitMask = PhysicsCategory.player
    player.physicsBody?.contactTestBitMask = PhysicsCategory.blueball
    player.physicsBody?.contactTestBitMask = PhysicsCategory.redball
    player.physicsBody?.collisionBitMask = PhysicsCategory.None

以下是检测碰撞的函数：

  func didBegin(_ contact: SKPhysicsContact) {

    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 & PhysicsCategory.player != 0) &&
        (secondBody.categoryBitMask & PhysicsCategory.redball != 0)) {
        RedballDidCollideWithPlayer(player: firstBody.node as! SKSpriteNode, redball:  secondBody.node as! SKSpriteNode)
    }
    if ((firstBody.categoryBitMask & PhysicsCategory.player != 0) &&
        (secondBody.categoryBitMask & PhysicsCategory.blueball != 0)) {
        BlueballDidCollideWithPlayer(player: firstBody.node as! SKSpriteNode, blueball:  secondBody.node as! SKSpriteNode)
    }
    if ((firstBody.categoryBitMask & PhysicsCategory.bounce != 0) &&
        (secondBody.categoryBitMask & PhysicsCategory.redball != 0)){
        RedballDidCollideWithBounce(bounce: firstBody.node as! SKSpriteNode, redball: secondBody.node as! SKSpriteNode)
    }
    if ((firstBody.categoryBitMask & PhysicsCategory.bounce != 0) &&
        (secondBody.categoryBitMask & PhysicsCategory.blueball != 0)) {
        BlueballDidCollideWithBounce(bounce: firstBody.node as! SKSpriteNode, blueball: secondBody.node as! SKSpriteNode)
    }
    if ((firstBody.categoryBitMask & PhysicsCategory.bounce != 0) &&
        (secondBody.categoryBitMask & PhysicsCategory.coin != 0)) {
        coinDidCollideWithplayer(player: firstBody.node as! SKSpriteNode, coin: secondBody.node as! SKSpriteNode)
    }
    if ((firstBody.categoryBitMask & PhysicsCategory.player != 0) &&
        (secondBody.categoryBitMask & PhysicsCategory.coin != 0)) {
        coinDidCollideWithplayer(player: firstBody.node as!        SKSpriteNode, coin: secondBody.node as! SKSpriteNode)
    }

}

下面是我用来设置蓝球的代码。这是另一个有问题的物理体:

    let blueball = SKSpriteNode(imageNamed: "blueball")
        blueball.position = enemyb.position
        blueball.physicsBody = SKPhysicsBody(circleOfRadius: blueball.size.width/2)
        blueball.physicsBody?.isDynamic = true
        blueball.physicsBody?.categoryBitMask = PhysicsCategory.blueball
        blueball.physicsBody?.contactTestBitMask = PhysicsCategory.player
        blueball.physicsBody?.contactTestBitMask = PhysicsCategory.bounce
        blueball.physicsBody?.collisionBitMask = PhysicsCategory.None
        blueball.physicsBody?.usesPreciseCollisionDetection = true
        addChild(blueball)
        let actionMove = SKAction.move(to: player.position, duration: 2)

这里的任何想法都会有所帮助。几天来，我一直试图找到问题，但没有运气。

Answer 1

当设置多个类别时，您必须将这些值或在一起。你的代码

player.physicsBody?.contactTestBitMask = PhysicsCategory.blueball
player.physicsBody?.contactTestBitMask = PhysicsCategory.redball

只需设置类别两次，第二次覆盖第一次。将此更改为:

player.physicsBody?.contactTestBitMask = PhysicsCategory.blueball | PhysicsCategory.redball