Question

我是SpriteKit和Swift的新手。花了太多时间尝试将位置/速度变化应用于didBeginContact中的主体，只读取Apple文档中的联系是只读的。修改碰撞中涉及的物体有什么好办法？

struct PhysicsCategory
{
    static let None: UInt32 = 0
    static let All: UInt32 = UInt32.max
    static let LeftWall: UInt32 = 0b1
    static let Food: UInt32 = 0b10
}

override func didMoveToView(view: SKView)
{
    for(var i = 0; i < 10; ++i)
    {
        var temp = SKSpriteNode(color: UIColor(red: 0.0, green: 0.7, blue: 0.0, alpha: 1.0), size: CGSizeMake(size, size))
        temp.position.x = self.scene!.size.width/2.0
        temp.position.y = self.scene!.size.height/2.0
        temp.physicsBody = SKPhysicsBody(rectangleOfSize: temp.size)
        temp.physicsBody!.categoryBitMask = PhysicsCategory.Food
        temp.physicsBody!.contactTestBitMask = PhysicsCategory.LeftWall
        temp.physicsBody!.collisionBitMask = PhysicsCategory.None
        temp.physicsBody!.velocity.dx = self.randomBetweenNumbers(0.0, secondNum: 0.5) - 0.25
        temp.physicsBody!.velocity.dy = self.randomBetweenNumbers(0.0, secondNum: 0.5) - 0.25
        self.addChild(temp)
    }
}

func didBeginContact(contact: SKPhysicsContact)
{
    if (contact.bodyA.categoryBitMask & PhysicsCategory.Food != 0) && (contact.bodyB.categoryBitMask & PhysicsCategory.LeftWall != 0)
    {
        contact.bodyA!.velocity.dx = 0.0
        println("\(contact.bodyA.velocity.dx)") //isn't 0.0
    }
}

Answer 1

课外

    let firstObjectCategory:UInt32 = 0x1 << 0
    let secondObjectCategory:UInt32 = 0x1 << 1

    var marker:Int= 0

在你的DidMoveToView

中

    node1.physicsBody?.categoryBitMask = firstObjectCategory
    node1.physicsBody?.contactTestBitMask = secondObjectCategory
    if marker=1
    { 
        node1.velocity.dx = 0.0
    }else{
        node1.velocity.dx = what you want
    }

    node2.physicsBody?.categoryBitMask = secondObjectCategory
    node2.physicsBody?.contactTestBitMask = firstObjectCategory

测试两个物理机构之间的接触：

    func didBeginContact(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 & firstObjectCategory) != 0 && (secondBody.categoryBitMask & secondObjectCategory) != 0)
        {
          marker=1
        }
    }

我希望它能帮到你

无法修改didBeginContact中的contact.bodyA

1 个答案: