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在游戏开发中，比如跑酷游戏。我们需要实现背景的无限循环滚动，来营造运动的效果。除了单层的背景滚动，还有视差滚动。
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import SpriteKitclass BackGround :SKNode { //近处背景数组 var arrBG = [SKSpriteNode]() //远处背景数组 var arrFar = [SKSpriteNode]() override init() { super.init() //获取远处背景的纹理 var farTexture = SKTexture(imageNamed: "background_f1") //远处背景由3章无缝图衔接而成 var farBg0 = SKSpriteNode(texture: farTexture) farBg0.anchorPoint = CGPointMake(0, 0) farBg0.zPosition = 9 farBg0.position.y = 150 var farBg1 = SKSpriteNode(texture: farTexture) farBg1.anchorPoint = CGPointMake(0, 0) farBg1.zPosition = 9 farBg1.position.x = farBg0.frame.width farBg1.position.y = farBg0.position.y var farBg2 = SKSpriteNode(texture: farTexture) farBg2.anchorPoint = CGPointMake(0, 0) farBg2.zPosition = 9 farBg2.position.x = farBg0.frame.width * 2 farBg2.position.y = farBg0.position.y self.addChild(farBg0) self.addChild(farBg1) self.addChild(farBg2) arrFar.append(farBg0) arrFar.append(farBg1) arrFar.append(farBg2) //近处背景纹理 var texture = SKTexture(imageNamed: "background_f0") //近处背景由2章无缝衔接图组成 var bg0 = SKSpriteNode(texture: texture) bg0.anchorPoint = CGPointMake(0, 0) var bg1 = SKSpriteNode(texture: texture) bg1.anchorPoint = CGPointMake(0, 0) bg1.position.x = bg0.frame.width bg0.zPosition = 10 bg1.zPosition = 10 bg0.position.y = 70 bg1.position.y = bg0.position.y self.addChild(bg0) self.addChild(bg1) arrBG.append(bg0) arrBG.append(bg1) } required init(coder aDecoder: NSCoder) { fatalError("init(coder:) has not been implemented") } //移动方法 func move(speed:CGFloat){ //通过遍历获取背景，然后做x方向的改变 for bg in arrBG { bg.position.x -= speed } //循环滚动算法 if arrBG[0].position.x + arrBG[0].frame.width < speed { arrBG[0].position.x = 0 arrBG[1].position.x = arrBG[0].frame.width } //远景同上 for far in arrFar { far.position.x -= speed/4 } if arrFar[0].position.x + arrFar[0].frame.width < speed/4 { arrFar[0].position.x = 0 arrFar[1].position.x = arrFar[0].frame.width arrFar[2].position.x = arrFar[0].frame.width * 2 } }} |
主场景类 GameScene.swift
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import SpriteKitclass GameScene: SKScene { lazy var bg = BackGround() //背景移动速度 var bgMoveSpeed:CGFloat = 3 override func didMoveToView(view: SKView) { //场景的背景颜色 let skyColor = SKColor(red:113/255,green:197/255,blue:207/255,alpha:1) self.backgroundColor = skyColor //设置背景 self.addChild(bg) } override func touchesBegan(touches: NSSet, withEvent event: UIEvent) { } override func update(currentTime: CFTimeInterval) { bg.move(bgMoveSpeed/5) }} |
源码下载：
DynamicBg.zip
Swift - 多层无缝循环滚动背景（SpriteKit游戏开发）
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原文地址：http://www.cnblogs.com/Free-Thinker/p/4841105.html
