var jumpStart = 0.0

var jumpEnd = 0.0

panda.jumpEnd = panda.position.yif panda.jumpEnd-panda.jumpStart <= -70 {        panda.roll()}

import SpriteKitclass GameScene: SKScene,ProtocolMainScene ,SKPhysicsContactDelegate{        @lazy var panda = Panda()    @lazy var platformFactory = PlatformFactory()    @lazy var bg = BackGround()        var moveSpeed:CGFloat = 15    var lastDis = 0.0        func didBeginContact(contact: SKPhysicsContact!) {                if (contact.bodyA.categoryBitMask | contact.bodyB.categoryBitMask) == ( BitMaskType.platform | BitMaskType.panda ){            panda.run()                        panda.jumpEnd = panda.position.y            if panda.jumpEnd-panda.jumpStart <= -70 {                panda.roll()            }        }                if (contact.bodyA.categoryBitMask | contact.bodyB.categoryBitMask) == ( BitMaskType.scene | BitMaskType.panda ){            println("游戏结束！")        }    }    func didEndContact(contact: SKPhysicsContact!){        panda.jumpStart = panda.position.y            }    override func didMoveToView(view: SKView) {        let skyColor = SKColor(red:113/255,green:197/255,blue:207/255,alpha:1)        self.backgroundColor = skyColor                //背景        self.addChild(bg)        bg.zPosition = 20                self.physicsWorld.contactDelegate = self        self.physicsWorld.gravity = CGVectorMake(0, -5)        self.physicsBody = SKPhysicsBody(edgeLoopFromRect: self.frame)        self.physicsBody.categoryBitMask = BitMaskType.scene        self.physicsBody.dynamic = false                panda.position = CGPointMake(200, 400)        panda.zPosition = 40        self.addChild(panda)                self.addChild(platformFactory)        platformFactory.sceneWidth = self.frame.size.width        platformFactory.delegate = self        platformFactory.zPosition = 30        platformFactory.createPlatform(3, x: 0, y: 200)    }        override func touchesBegan(touches: NSSet, withEvent event: UIEvent) {        panda.jump()    }       override func update(currentTime: CFTimeInterval) {        bg.move(moveSpeed/5)        lastDis -= moveSpeed        if lastDis <= 0 {            println("生成新的平台")            //platformFactory.createPlatform(1, x: 1500, y: 200)            platformFactory.createPlatformRandom()        }        platformFactory.move(moveSpeed)    }    func onGetData(dist:CGFloat){        self.lastDis = dist;    }}protocol ProtocolMainScene {    func onGetData(dist:CGFloat)}

import SpriteKitenum Status:Int{    case run=1,jump,jump2,roll;}class Panda : SKSpriteNode {    let runAtlas = SKTextureAtlas(named: "run.atlas")    let runFrames = [SKTexture]()        let jumpAtlas = SKTextureAtlas(named: "jump.atlas")    let jumpFrames = [SKTexture]();        let rollAtlas = SKTextureAtlas(named: "roll.atlas")    let rollFrames = [SKTexture]();        var status = Status.run    //起跳 y坐标    var jumpStart = 0.0    //落地 y坐标    var jumpEnd = 0.0    init(){        let texture = runAtlas.textureNamed("panda_run_01")        let size = texture.size()        super.init(texture:texture,color:SKColor.whiteColor(),size:size)                var i:Int        for i=1 ; i<=runAtlas.textureNames.count ; i++ {            let tempName = String(format: "panda_run_%.2d", i)            let runTexture = runAtlas.textureNamed(tempName)            if runTexture {                runFrames.append(runTexture)            }        }        for i=1 ; i<=jumpAtlas.textureNames.count ; i++ {            let tempName = String(format: "panda_jump_%.2d", i)            let jumpTexture = jumpAtlas.textureNamed(tempName)            if jumpTexture {                jumpFrames.append(jumpTexture)            }        }        for i=1 ; i<=rollAtlas.textureNames.count ; i++ {            let tempName = String(format: "panda_roll_%.2d", i)            let rollTexture = rollAtlas.textureNamed(tempName)            if rollTexture {                rollFrames.append(rollTexture)            }        }                self.physicsBody = SKPhysicsBody(rectangleOfSize: texture.size())        self.physicsBody.dynamic = true        self.physicsBody.allowsRotation = false        //摩擦力        self.physicsBody.restitution = 0        self.physicsBody.categoryBitMask = BitMaskType.panda        self.physicsBody.contactTestBitMask = BitMaskType.scene | BitMaskType.platform        self.physicsBody.collisionBitMask = BitMaskType.platform        run()    }    func run(){        self.removeAllActions()        self.status = .run        self.runAction(SKAction.repeatActionForever(SKAction.animateWithTextures(runFrames, timePerFrame: 0.05)))    }        func jump (){        self.removeAllActions()        if status != Status.jump2{            self.runAction(SKAction.animateWithTextures(jumpFrames, timePerFrame: 0.05))            self.physicsBody.velocity = CGVectorMake(0, 450)            if status == Status.jump{                status = Status.jump2                self.jumpStart = self.position.y;            }else {                status = Status.jump            }        }            }        func roll(){        self.removeAllActions()        status = .roll        self.runAction(SKAction.animateWithTextures(rollFrames, timePerFrame: 0.05),completion:{() in self.run()})    }    }