我该如何设置才能让我的玩家和 object 拥有物理 body？

Question

创建像 Doodle Jump 这样的游戏，除了从平台弹回外，我的英雄从 objects 弹回以收集积分和游戏进度。作为我的英雄 "bounces off" object，我将其设置为 removeFromParent 并且它正常工作。但是，如果我的英雄错过了 object 并且不小心撞到墙壁或地面，object 也会消失，这很奇怪，因为我的地面没有物理 body.

这是我的 GameScene 代码：

 import SpriteKit

 var player: Player!
 var ground: Ground!
 var snowflake: Snowflake!
 var isFingerOnPlayer = false
 var gameOver = false
 var playerTouched = false
 var touching: Bool = false
 var lastTouch: CGPoint? = nil
 let xPlayerForce: CGFloat = 40
 let yPlayerForce: CGFloat = 50
 var touchPoint: CGPoint = CGPoint()

 struct Collision {
    static let player: UInt32 = 1
    static let snowflake: UInt32 = 2
 }

 class GameScene: SKScene, SKPhysicsContactDelegate {
    override func didMoveToView(view: SKView) {
        player = Player()
        player.position = CGPointMake(20, 150)
        addChild(player)

        ground = Ground()
        ground.position = CGPointMake(10, -37)
        addChild(ground)

        player.physicsBody?.linearDamping = 0.0
        player.physicsBody?.angularDamping = 500.0
        player.physicsBody = SKPhysicsBody(rectangleOfSize: player.size)
        player.physicsBody?.allowsRotation = false
        player.physicsBody?.mass = 0
        player.physicsBody?.friction = 1
        player.physicsBody?.dynamic = true
        physicsWorld.contactDelegate = self
        physicsWorld.gravity = CGVector(dx: 0.0, dy: -3.0)

        self.backgroundColor = SKColor(red: 0.15, green: 0.15, blue: 0.3, alpha: 1.0)
        snowflake = Snowflake()
        addChild(snowflake)
        self.physicsBody = SKPhysicsBody(edgeLoopFromRect: self.frame)
    }

    override func touchesBegan(touches: Set<NSObject>, withEvent event: UIEvent) {
        for touch: AnyObject in touches {
            let touchLocation = touch.locationInNode(self)
            lastTouch = touchLocation

            player.physicsBody?.categoryBitMask = snowCategory
            player.physicsBody?.contactTestBitMask = playerCategory
            player.physicsBody?.affectedByGravity = true
            player.physicsBody?.collisionBitMask = playerCategory
            player.physicsBody?.usesPreciseCollisionDetection = true
        }
    }

    func touchedPlayer() {
        playerTouched = true
        snowflake.removeFromParent()
        player.bounceOff()
    }

    override func touchesMoved(touches: Set<NSObject>, withEvent event: UIEvent) {
        lastTouch = nil
    }

    override func touchesEnded(touches: Set<NSObject>, withEvent event: UIEvent) {
        lastTouch = nil
    }

    override func update(currentTime: NSTimeInterval) {
        if let touch = lastTouch {
            var xForce: CGFloat = 0.0
            var yForce: CGFloat = 0.0
            let xTouchOffset = (touch.x - player.position.x)
            let yTouchOffset = (touch.y - player.position.y)

            if xTouchOffset > 0.0 {
                xForce = xPlayerForce
            } else if xTouchOffset < 0.0 {
                xForce = -xPlayerForce
            } // else we do nothing

            if yTouchOffset > 0.0 {
                yForce = yPlayerForce
            } else if xTouchOffset > 0.0 {
                yForce = -yPlayerForce
            }
            // here you can choose whether you want it to push
            // the player node down, using similar code from the
            // above if statement

            let impulseVector = CGVector(dx: xForce, dy: yForce)
            player.physicsBody?.applyImpulse(impulseVector)
        }
    }

    func didBeginContact(contact: SKPhysicsContact) {
        touchedPlayer()
    }
}

Answer 1

尽管不清楚什么是雪花实体。

有一个密码：

 self.physicsBody = SKPhysicsBody(edgeLoopFromRect: self.frame)

你的框架有优势。

来自描述：

从 CGRect 创建边循环。边缘没有体积，旨在用于创建静态环境。 边缘可以与体积的主体碰撞，但不能相互碰撞。

方法中 func didBeginContact（联系人：SKPhysicsContact）使用 contact.contactBodyA.categoryBitMask 忽略此联系人。（应为零）。

我该如何设置才能让我的玩家和 object 拥有物理 body？

How do I set it up so that only my player and an object have a physics body?

collision-detection

sprite-kit

swift