在swift 4中移动背景

嗨，我正在尝试无休止地移动背景，但我在模拟代码时遇到了一个小问题

这是我的密码

didMove(to view: SKView) {

    for i  in 0...1 {
        let backgroundNEW = SKSpriteNode(imageNamed: "New_Background")
        backgroundNEW.size = self.size
        backgroundNEW.anchorPoint = CGPoint(x: 0.5 , y: 0)
        backgroundNEW.position = CGPoint(x: self.size.width  ,  y: self.size.height  * CGFloat(i))
        backgroundNEW.zPosition = -1
        backgroundNEW.name = "test"
        addChild(backgroundNEW)
    }
}

及

var lastUpdateTime:TimeInterval=0
变量deltaFrameTime:TimeInterval=0
var amountToMovePerSecond:CGFloat=200.0
覆盖函数更新（uCurrentTime:TimeInterval）{
如果lastUpdateTime==0{
lastUpdateTime=currentTime
}
否则{
deltaFrameTime=currentTime-lastUpdateTime
lastUpdateTime=currentTime
}
设amountToMoveBackground=amountToMovePerSecond*CGFloat（deltaFrameTime）
self.enumerateChildNodes（名称为“test”）{
背景新的，请稍候
backgroundNEW.position.x-=移动背景的数量
如果背景为New.position.x<-self.size.height{
backgroundNEW.position.x+=自身尺寸高度*2
}
}
}

我得到了这个模拟：

---

我的问题是黑色背景，我不知道如何替换它以使背景不断移动。

这是我用来无限滚动背景的代码（假设您使用的是SpriteKit？），您需要两个背景，使其具有无限滚动背景的外观和感觉。我将其更新为3个背景，以提供一个无限卷轴

在您的

didMove（toView:）

方法之外

var bg = SKSpriteNode()
var bg2 = SKSpriteNode()
var bg3 = SKSpriteNode()

var parallax = SKAction()

bg = SKSpriteNode(imageNamed: "texture")
bg.position = CGPoint(x: 0, y:0)
bg.zPosition = 3
bg.size = CGSize(width:Int, height:Int) //make sure to set the width to self.frame.size.width, the height can be anything

bg2 = SKSpriteNode(imageNamed: "texture")
bg2.position = CGPoint(x: self.frame.size.width, y:0)
bg2.zPosition = 3
bg2.size = CGSize(width:Int, height:Int) //make sure to set the width to self.frame.size.width, the height can be anything

bg3 = SKSpriteNode(imageNamed: "texture")
bg3.position = CGPoint(x: self.frame.size.width + bg2.position.x, y:0)
bg3.zPosition = 3
bg3.size = CGSize(width:Int, height:Int) //make sure to set the width to self.frame.size.width, the height can be anything

self.addChild(bg)
self.addChild(bg2)
self.addChild(bg3)

在

didMove（toView:）

方法中设置背景

var bg = SKSpriteNode()
var bg2 = SKSpriteNode()
var bg3 = SKSpriteNode()

var parallax = SKAction()

bg = SKSpriteNode(imageNamed: "texture")
bg.position = CGPoint(x: 0, y:0)
bg.zPosition = 3
bg.size = CGSize(width:Int, height:Int) //make sure to set the width to self.frame.size.width, the height can be anything

bg2 = SKSpriteNode(imageNamed: "texture")
bg2.position = CGPoint(x: self.frame.size.width, y:0)
bg2.zPosition = 3
bg2.size = CGSize(width:Int, height:Int) //make sure to set the width to self.frame.size.width, the height can be anything

bg3 = SKSpriteNode(imageNamed: "texture")
bg3.position = CGPoint(x: self.frame.size.width + bg2.position.x, y:0)
bg3.zPosition = 3
bg3.size = CGSize(width:Int, height:Int) //make sure to set the width to self.frame.size.width, the height can be anything

self.addChild(bg)
self.addChild(bg2)
self.addChild(bg3)

现在来处理背景的滚动

parallax = SKAction.repeatForever(SKAction.move(by: CGVector(dx: -self.frame.size.width, dy: 0), duration: 20)) 
//higher duration moves it slower, lower duration moves it faster

bg.run(parallax)
bg2.run(parallax)
bg3.run(parallax)

最后，在每个帧之前更新的

update（currentTime:）

方法中

override func update(_ currentTime: TimeInterval) {
    // Called before each frame is rendered
    if bg.position.x <= -self.frame.size.width {
        bg.position.x = self.frame.size.width * 2
        //this ensures that your backgrounds line up perfectly 
    }
    if bg2.position.x <= -self.frame.size.width {
        bg2.position.x = self.frame.size.width * 2
        //this ensures that your backgrounds line up perfectly
    }
    if bg3.position.x <= -self.frame.size.width {
        bg3.position.x = self.frame.size.width * 2
        //this ensures that your backgrounds line up perfectly
    }
}

覆盖函数更新（\uCurrentTime:TimeInterval）{
//在渲染每个帧之前调用
如果bg.position.x，这非常简单。我将发布我游戏中的代码，向您展示我是如何做到的。您好。谢谢您的回复我尝试了您的代码，但他对我来说效果不好，我得到了这个，我将bg=SKSpriteNode（纹理：“纹理”）替换为let background=SKSpriteNode（ImageName:“background”）和let background2=SKSpriteNode（ImageName:“background2”）对于我得到的这个background2.size CGSize（宽度：self.frame.size.width，高度：self.frame.size.height）你知道我如何修复它吗？我使用Xcode 9和Sprite套件。如果它正常工作，你只需要添加第三个背景。我将编辑上面的答案，向你展示如何添加第三个背景。我编辑的答案已经过测试，效果非常好。