ios – SpriteKit – SKCameraNode视差效果？

概述我一直在试验SKCameraNode,但我找不到任何关于用它创建视差效果的东西. 假设我添加上面的代码,并在baseNode下面添加一个后台节点.然后我动画我的相机. let behindNode = SKNode()addChild(behindNode)let blueSquare = SKSpriteNode(color: SKColor.blueColor(), size: CGSi 我一直在试验SKCameraNode,但我找不到任何关于用它创建视差效果的东西.

假设我添加上面的代码,并在baseNode下面添加一个后台节点.然后我动画我的相机.

let behindNode = SKNode()addChild(behindNode)let blueSquare = SKSpriteNode(color: SKcolor.bluecolor(),size: CGSize(wIDth: 80,height: 80))blueSquare.position = CGPoint(x: size.wIDth/2+40,y: size.height/2+40)behindNode.addChild(blueSquare)let baseNode = SKNode()addChild(baseNode)let redSquare = SKSpriteNode(color: SKcolor.redcolor(),height: 80))redSquare.position = CGPoint(x: size.wIDth/2,y: size.height/2)baseNode.addChild(redSquare)let cameraNode = SKCameraNode()camera = cameraNodeaddChild(camera!)camera!.position = redSquare.positioncameraNode.runAction(SKAction.sequence([    SKAction.waitForDuration(1),SKAction.moveBy(CGVector(dx: 100,dy: 100),duration: 3),SKAction.moveBy(CGVector(dx: -100,duration: 1),dy: -100),duration: 1)]))

当相机移动时,我需要蓝色方块相对于红色方块以较慢的速度移动..我希望cameranode有相对位置字典或其他东西,但它不会…

解决方法 我创建了一个不处理秒或帧的解决方案.

您可以创建SKCameraNode的子类,并使用Swift的dIDSet()方法,该方法在更改类变量后调用.在我们的例子中,我们想要监听摄像机节点位置变量的变化.

class CameraNodeParallax:SKCameraNode{overrIDe var position : CGPoint {    dIDSet {         // Move our backgrounds    }}

我们还希望创建一个包含所有视差背景节点的阵列,以及一个包含相对于摄像机移动速度的相应移动速度的阵列.

var backgroundNodes:[SKNode] = []var backgroundNodesspeedFactor:[CGVector] = [] // in relation to camera nodes speedfunc addParallaxBackgroundNode(background:SKNode,vector:CGVector) {    backgroundNodes.append(background)    backgroundNodesspeedFactor.append(vector)}

填充我们的新变量的init()也可能很有用

init(position:CGPoint) {  super.init()  self.position = position}

现在我们可以填充dIDSet()监听器：

// Move our backgroundsvar i = 0for node in backgroundNodes {    let positionChangeX = position.x-oldValue.x    let positionChangeY = position.y-oldValue.y    let changeX = positionChangeX*backgroundNodesspeedFactor[i].dx    let changeY = positionChangeY*backgroundNodesspeedFactor[i].dy    node.position = CGPointMake(node.position.x+changeX,node.position.y+changeY)    i += 1}

最终代码如下所示：

class CameraNodeParallax:SKCameraNode{    var backgroundNodes:[SKNode] = []    var backgroundNodesspeedFactor:[CGVector] = [] // in relation to camera nodes speed    init(position:CGPoint) {        super.init()        self.position = position    }    required init?(coder aDecoder: NSCoder) {        fatalError("init(coder:) has not been implemented")    }    overrIDe var position : CGPoint {        dIDSet {            // Move your parallax backgrounds                var i = 0                for node in backgroundNodes {                    let positionChangeX = position.x-oldValue.x                    let positionChangeY = position.y-oldValue.y                    let changeX = positionChangeX*backgroundNodesspeedFactor[i].dx                    let changeY = positionChangeY*backgroundNodesspeedFactor[i].dy                    node.position = CGPointMake(node.position.x+changeX,node.position.y+changeY)                    i += 1                }        }    }    func addParallaxBackgroundNode(background:SKNode,vector:CGVector) {        backgroundNodes.append(background)        backgroundNodesspeedFactor.append(vector)    }}

我在https://github.com/gitmalong/lovelySpriteKitHelpers/blob/master/ParallaxBackgroundMover.swift创建了一个不从SKCameraNode继承的替代实现

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