swift - 带有 SpriteKit 的点系统

Question

我正在制作一个游戏，其中我有一个球(玩家)，应该从屏幕的一侧到达另一侧。在两侧我都有一个 SKSpriteNode，球需要接触它才能得分。当球接触一侧的 SKSpriteNode 时，球需要到达另一侧并接触另一个 SKSpriteNode 才能得分。等等。我怎样才能使游戏开始时，顶部的 Sprite 节点处于事件状态，而当触摸该节点时，底部的 Sprite 节点处于事件状态？

我制作了一个“incrementScore”函数，每当球触及“点”时，得分就会加一:

func incrementScore() {
    score += 1
    scoreLabel.text = String(score)
}

然后我有两个“目标”，球需要触碰才能得分:

func createGoals() {

    let goalTop = SKSpriteNode(imageNamed: "Goal")
    goalTop.name = "Goal"
    goalTop.anchorPoint = CGPoint(x: 0.5, y: 0.5)
    goalTop.position = CGPoint(x: 0, y: 465)
    goalTop.physicsBody = SKPhysicsBody(rectangleOf: goalTop.size)
    goalTop.physicsBody?.affectedByGravity = false
    goalTop.physicsBody?.isDynamic = false
    goalTop.zPosition = 2
    self.addChild(goalTop)

    let goalBottom = SKSpriteNode(imageNamed: "Goal")
    goalBottom.name = "Goal"
    goalBottom.anchorPoint = CGPoint(x: 0.5, y: 0.5)
    goalBottom.position = CGPoint(x: 0, y: -435)
    goalBottom.physicsBody = SKPhysicsBody(rectangleOf: CGSize(width: 
    goalBottom.size.width - 10, height: goalBottom.size.height - 10))
    goalBottom.physicsBody?.affectedByGravity = false
    goalBottom.physicsBody?.isDynamic = false
    goalBottom.zPosition = 2
    self.addChild(goalBottom)

}

我还开始使用 didBegin 联系功能:

func didBegin(_ contact: SKPhysicsContact) {

    var firstBody = SKPhysicsBody()
    var secondBody = SKPhysicsBody()

    if contact.bodyA.node?.name == "Player" {
        firstBody = contact.bodyA
        secondBody = contact.bodyB
    } else {
        firstBody = contact.bodyB
        secondBody = contact.bodyA
    }

    if firstBody.node?.name == "Player" && secondBody.node?.name == 
    "Point" {
        incrementScore()
    }
}

Answer 1

使用categoryBitMask启用事件主体:

当您希望 goalTop 处于事件状态时:

goalTop.categoryBitMask = category.Goal
goalBottom.categoryBitMask = 0

当您希望 goalBottom 处于事件状态时:

goalTop.categoryBitMask = 0
goalBottom.categoryBitMask = category.Goal

注意:category.Goal 是您用作类别的任何数字