我正在制作一个游戏，其中我有一个被创建为SKSpriteNode的球，它与一些我不想碰撞的物体发生碰撞。这是我的球:

orangeBall = OrangeBall(path: ballTrajectory, color: UIColor.orange, borderColor: UIColor.black)
    orangeBall.physicsBody = SKPhysicsBody(circleOfRadius: Physics.PhysicsNumbers.ballRadius)
    orangeBall.position = Physics.PhysicsNumbers.ballRestPos
    orangeBall.physicsBody?.categoryBitMask = CollisionsChecker.Ball
    orangeBall.physicsBody?.collisionBitMask = CollisionsChecker.Frame | CollisionsChecker.Box | CollisionsChecker.Score
    orangeBall.physicsBody?.contactTestBitMask = CollisionsChecker.Frame | CollisionsChecker.Box | CollisionsChecker.Score
    orangeBall.physicsBody?.isDynamic = false
    orangeBall.physicsBody?.affectedByGravity = false
    addChild(orangeBall)

我希望它检测到它已经与这个分数物理体接触，但实际上并没有碰撞：

score = NetBoxes(path: scoreStationary, color: UIColor.red, borderColor: UIColor.red)
    score.position = Physics.PhysicsNumbers.scoreRest
    score.physicsBody = SKPhysicsBody(circleOfRadius: 50)
    score.physicsBody?.categoryBitMask = CollisionsChecker.Score
    score.physicsBody?.contactTestBitMask = 0
    score.physicsBody?.collisionBitMask = CollisionsChecker.Ball
    score.physicsBody?.affectedByGravity = false
    score.physicsBody?.isDynamic = false
    addChild(score)

（circleOfRadius仅用于测试目的）每次我尝试检查碰撞时，它似乎都没有输出我希望它执行的操作：

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

    if firstBody.categoryBitMask == CollisionsChecker.Ball && secondBody.categoryBitMask == CollisionsChecker.Score || firstBody.categoryBitMask == CollisionsChecker.Score && secondBody.categoryBitMask == CollisionsChecker.Ball{
        print("Ball in hoop")
    }

本质上，我的橙色球是一个SKSphapeNode，它总是与我的分数物理体相撞。也可能是我球周围的两个物理体和分数都接触到了。我不知所措，任何帮助都将不胜感激！