swift - 尽管位掩码不同，但 Sprite 碰撞

Question

我的 Sprite 有 5 个不同类别的位掩码:

• redBullet(敌人射击)
• greenBullet(玩家射击)
• shipCategory(玩家雪碧)
• enemyShipCategory(AI Sprite )
• wallCategory(屏幕边框)

我已经正确设置了位掩码，但我遇到了一些不应该发生的冲突。两颗子弹将相互碰撞并碰撞墙壁，而不是穿过墙壁。如果这些位掩码未包含在 collisionBitmap 中，为什么会发生这种情况？

let shipCategory: UInt32 = 1
let wallCategory: UInt32 = 2
let greenBulletCategory: UInt32 = 3
let enemyShipCategory: UInt32 = 4
let redBulletCategory: UInt32 = 5

    self.anchorPoint = CGPoint.init(x: 0.5, y: 0.5)
    setUpHeaderUI()
    self.physicsWorld.gravity = CGVector.zero
    self.physicsWorld.contactDelegate = self
    createBG()
    addShip()
    self.physicsBody = SKPhysicsBody.init(edgeLoopFrom: self.frame)
    self.physicsBody?.collisionBitMask = shipCategory | enemyShipCategory
    self.physicsBody?.categoryBitMask = wallCategory
    self.physicsBody?.friction = 0

func enemyShoot(node: SKSpriteNode){
    Bullet = SKSpriteNode.init(imageNamed: "red.svg.hi")
    Bullet.zPosition = 1
    Bullet.setScale(0.2)
    Bullet.position = node.position
    Bullet.physicsBody = SKPhysicsBody.init(rectangleOf: Bullet.size)
    Bullet.physicsBody?.isDynamic = true
    Bullet.physicsBody?.allowsRotation = true
    Bullet.physicsBody?.linearDamping = 0
    Bullet.physicsBody?.friction = 0
    Bullet.physicsBody?.categoryBitMask = redBulletCategory
    Bullet.physicsBody?.contactTestBitMask = shipCategory
    Bullet.physicsBody?.velocity = CGVector.init(dx: ((node.physicsBody?.velocity.dx)!/100), dy: CGFloat.init(-750))
    Bullet.name = "Bullet"
    self.addChild(Bullet)
}

func playerShoot(){
    changePower(change: 10)
    if(power > 99 ){
        consPowerTimer.invalidate()
        changePower(change: 100 - power)
        canFire = false
        powerTimer = Timer.scheduledTimer(timeInterval: 1, target: self, selector: #selector(self.powerCooldown), userInfo: nil, repeats: true)
    }
    else{
    Bullet = SKSpriteNode.init(imageNamed: "green.svg.hi")
    Bullet.zPosition = 1
    Bullet.zRotation = CGFloat.init(3 * Double.pi/2)
    Bullet.setScale(0.2)
    Bullet.position = ship.position
    Bullet.physicsBody = SKPhysicsBody.init(rectangleOf: Bullet.size)
    Bullet.physicsBody?.isDynamic = true
    Bullet.physicsBody?.allowsRotation = true
    Bullet.physicsBody?.linearDamping = 0
    Bullet.physicsBody?.friction = 0
    Bullet.physicsBody?.categoryBitMask = greenBulletCategory
    Bullet.physicsBody?.contactTestBitMask = enemyShipCategory
    print(ship.physicsBody?.velocity.dx)
    Bullet.physicsBody?.velocity = CGVector.init(dx: (ship.physicsBody?.velocity.dx)!, dy: CGFloat.init(750))
    Bullet.name = "Bullet"
    self.addChild(Bullet)
    }

func addAttackShip(){
    //30,40,40
    let enemy = attackShip.init()
    enemy.setScale(0.08)
    enemy.zRotation = CGFloat(0)
    enemy.physicsBody = SKPhysicsBody.init(rectangleOf: enemy.size)
    enemy.physicsBody?.isDynamic = true
    enemy.name = "enemy"
    enemy.zPosition = 2
    enemy.physicsBody?.mass = CGFloat.init(10)
    enemy.physicsBody?.friction = 0
    enemy.physicsBody?.categoryBitMask = enemyShipCategory
    enemy.physicsBody?.collisionBitMask = enemyShipCategory | wallCategory
    enemy.physicsBody?.contactTestBitMask = greenBulletCategory | shipCategory
    enemy.position = CGPoint.init(x: 0, y: 155.504 - enemy.size.height / 2)
    enemy.zRotation = CGFloat(2.4870942)
    let healthindicator = SKSpriteNode.init(color: UIColor.green, size: CGSize.init(width: 150, height: 30))
    healthindicator.name = "healthdisplay"
    healthindicator.zPosition = 3
    healthindicator.zRotation = -1 * CGFloat(2.4870942)
    enemy.addChild(healthindicator)
    addChild(enemy)
}

func addShip() {
    ship = SKSpriteNode(imageNamed: "Spaceship")
    ship.setScale(0.2)
    ship.zRotation = CGFloat(0)
    ship.physicsBody = SKPhysicsBody(rectangleOf: ship.size)
    ship.physicsBody?.isDynamic = true
    ship.name = "ship"
    ship.position = CGPoint.init(x: 0, y: (-(self.frame.size.height/2)) + ship.size.height/2)
    ship.zPosition = 2
    ship.physicsBody?.mass = CGFloat.init(10)
    ship.physicsBody?.friction = 0
    ship.physicsBody?.categoryBitMask = shipCategory
    ship.physicsBody?.collisionBitMask = wallCategory
    ship.physicsBody?.contactTestBitMask = redBulletCategory | enemyShipCategory
    self.addChild(ship)
    if motionManager.isAccelerometerAvailable == true {
        motionManager.startAccelerometerUpdates(to: OperationQueue.current!, withHandler:{
            data, error in
            if (data!.acceleration.y) < -0.05 {
                self.velocity = -500
            }

            else if data!.acceleration.y > 0.05 {
                self.velocity = 500
         }
            else{
                self.velocity = 0
            }

        })

    }
}

Answer 1

你的子弹的 physicsBody 不是一个 collisionBitmask。因此，它将采用 0xFFFFFFFF 的默认掩码并与所有内容发生冲突。如果您不需要它与任何东西发生碰撞，请为其指定一个 collisionMask 为 0。