Swift - 跳跃吃苹果游戏开发（SpriteKit游戏开发）

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import SpriteKit

class AppleFactory:SKNode{

    //定义苹果纹理

    let appleTexture = SKTexture(imageNamed: "apple")

    //游戏场景的狂赌

    var sceneWidth :CGFloat = 0.0

    //定义苹果数组

    var arrApple = [SKSpriteNode]()

    //定时器

    var timer = NSTimer()

    func onInit(width:CGFloat) {

        self.sceneWidth = width

        //启动的定时器

        timer = NSTimer.scheduledTimerWithTimeInterval( 0.2, target: self,

            selector: "createApple", userInfo: nil, repeats: true)

    }

    //创建苹果类

    func createApple(){

        //通过随机数来随机生成苹果

        //算法是，随机生成0-9的数，当随机数大于8的时候声称苹果

        //也就是说，有1/10的几率生成苹果

        //这样游戏场景中的苹果就不会整整齐齐以相同间隔出现了

        let random = arc4random() % 10

        if random > 8 {

            //生成苹果

            let apple = SKSpriteNode(texture: appleTexture)

            //设置物理体

            apple.physicsBody = SKPhysicsBody(rectangleOfSize: apple.size)

            //弹性设为0

            apple.physicsBody?.restitution = 0

            //物理体标识

            apple.physicsBody?.categoryBitMask = BitMaskType.apple

            //不受物理效果影响

            apple.physicsBody?.dynamic = false

            //设置中心点

            apple.anchorPoint = CGPointMake(0, 0)

            //z轴深度

            apple.zPosition = 40

            //设定位置

            let theY = CGFloat(arc4random()%200 + 200)

            apple.position  = CGPointMake(sceneWidth+apple.frame.width , theY)

            //加入数组

            arrApple.append(apple)

            //加入场景

            self.addChild(apple)

        }

    }

    //苹果移动方法

    func move(speed:CGFloat){

        for apple in arrApple {

            apple.position.x -= speed

        }

        //移出屏幕外时移除苹果

        if arrApple.count > 0 && arrApple[0].position.x < -20{

            arrApple[0].removeFromParent()

            arrApple.removeAtIndex(0)

        }

    }

    //重置方法

    func reSet(){

        //移除所有子对象

        self.removeAllChildren()

        //清空苹果数组

        arrApple.removeAll(keepCapacity: false)

    }

}

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import SpriteKit

class Panda: SKSpriteNode {

    //定义纹理

    let pandaTexture = SKTexture(imageNamed: "panda")

    init() {

        //执行父类的构造方法

        super.init(texture:pandaTexture,color:SKColor.whiteColor(),size:pandaTexture.size())

        //设置中心点

        self.anchorPoint = CGPointMake(0, 0)

        self.physicsBody = SKPhysicsBody(rectangleOfSize:pandaTexture.size())

        self.physicsBody?.dynamic = true

        self.physicsBody?.allowsRotation = false

        //弹性

        self.physicsBody?.restitution = 0

        self.physicsBody?.categoryBitMask = BitMaskType.panda

        self.physicsBody?.contactTestBitMask = BitMaskType.scene|BitMaskType.apple

        self.physicsBody?.collisionBitMask = BitMaskType.scene

    }

    required init(coder aDecoder: NSCoder) {

        fatalError("init(coder:) has not been implemented")

    }

    //跳

    func jump (){

        //施加一个向上的力，让小人跳起来

        self.physicsBody?.velocity = CGVectorMake(0, 700)

    }

}

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class BitMaskType {

    class var panda:UInt32{

        return 1<<0

    }

    class var apple:UInt32{

        return 1<<1

    }

    class var scene:UInt32{

        return 1<<2

    }

}

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import SpriteKit

class GameScene: SKScene,SKPhysicsContactDelegate {

    lazy var appleFactory = AppleFactory()

    lazy var panda = Panda()

    //移动速度

    var moveSpeed:CGFloat = 15

    //吃到的苹果数

    var appleNum = 0

    override func didMoveToView(view: SKView) {

        //物理世界代理

        self.physicsWorld.contactDelegate = self

        //重力设置

        self.physicsWorld.gravity = CGVectorMake(0, -5)

        //设置物理体

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

        //设置种类标示

        self.physicsBody?.categoryBitMask = BitMaskType.scene

        //是否响应物理效果

        self.physicsBody?.dynamic = false

        //场景的背景颜色

        let skyColor = SKColor(red:113/255,green:197/255,blue:207/255,alpha:1)

        self.backgroundColor = skyColor

        //给小人定一个初始位置

        panda.position = CGPointMake(200, 400)

        //将小人显示在场景中

        self.addChild(panda)

        //苹果工厂

        appleFactory.onInit(self.frame.width)

        self.addChild( appleFactory )

    }

    override func touchesBegan(touches: Set<UITouch>, withEvent event: UIEvent?) {

        panda.jump()

    }

    override func update(currentTime: CFTimeInterval) {

        appleFactory.move(moveSpeed)

    }

    //碰撞检测方法

    func didBeginContact(contact: SKPhysicsContact) {

        //熊猫和苹果碰撞

        if (contact.bodyA.categoryBitMask | contact.bodyB.categoryBitMask)

            == (BitMaskType.apple | BitMaskType.panda){

                //苹果计数加1

                self.appleNum++

                //如果碰撞体A是苹果，隐藏碰撞体A，反之隐藏碰撞体B

                //（因为苹果出了屏幕都会被移除，所以这里隐藏就可以了）

                if contact.bodyA.categoryBitMask == BitMaskType.apple {

                    contact.bodyA.node?.hidden = true

                }else{

                    contact.bodyB.node?.hidden = true

                }

        }

    }

}