下面是生成一个“围住神经猫”游戏的初始场景：

1，界面下方会生成9*9共81个圆点，同时圆点内部添加文本标签显示索引

2，默认圆点为灰色，每行随机取两个点变为红色

3，奇数行和偶数行有一定的错位，错位的横向距离是圆的半径

效果图如下：

1，首先给资源库Images.xcassets添加资源图片：

2，圆点类 GaPoint.swift

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import SpriteKit   //圆点类型枚举 enum PointType : Int {      //灰0 红1      case gray=0,red; }   class GaPoint : SKSpriteNode {        //自身索引      var index = 0      //圆点类型，默认为灰色点      var type = PointType .gray      //圆点内的文本节点      var label: SKLabelNode ?            //设置文本节点的文字      func onSetLabel(i: String ){          if label == nil {              //文本节点的字体              label = SKLabelNode (fontNamed: "Chalkduster" )              //文本节点的字体大小              label!.fontSize = 22              //文本节点的位置              label!.position = CGPointMake (0, -10)              //取消文本节点的交互性              label!.userInteractionEnabled = false              //将文本节点加入圆点类              self .addChild(label!)          }          //设置文本节点的内容          label!.text = i      } }

3，圆点容器类 PointContainer.swift

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import SpriteKit   class PointContainer : SKNode , UIAlertViewDelegate {      //灰点纹理      let textPoint1 = SKTexture (imageNamed: "pot1" )      //红点纹理      let textPoint2 = SKTexture (imageNamed: "pot2" )      //记录所有圆点的数组      var arrPoint = [ GaPoint ]()           func onInit(){          for i in 0...80 {              //默认为灰色点              let point = GaPoint (texture: textPoint1)              //对行数除以9取整，用来为下面判断奇偶行做准备              let row = Int (i/9)              //列              let col = i%9              //x轴位移              var gap = 0              //奇偶行判断              if Int (row % 2) == 1 {                  gap = Int (textPoint1.size().width)/2              } else {                                }              //取得纹理尺寸，用作计算位置              let width = Int (textPoint1.size().width)              //计算x坐标              let x  = col * (width+5) - (9*width)/2 + gap              //计算y坐标              let y  = row * width - (9*width)/2              //设置位置              point.position = CGPointMake ( CGFloat (x), CGFloat (y))                            //记录索引              point.index = i              point.onSetLabel( "\(i)" )              //设置z轴排序              point.zPosition = 10              //将点加入PointContainer中              self .addChild(point)              //将点加入数组中              arrPoint.append(point)          }            //随机生成红点          onCreateRed()      }            //随机生成红色的点      func onCreateRed(){          for i in 0...8 {              let r1 = Int (arc4random() % 9) + i * 9              let r2 = Int (arc4random() % 9) + i * 9              onSetRed(r1)              onSetRed(r2)          }      }            //改变圆点类型      func onSetRed(index: Int ){          arrPoint[index].type = PointType .red          arrPoint[index].texture = textPoint2      } }

4，主界面 GameScene.swift

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import SpriteKit   class GameScene : SKScene {            let pointContainer = PointContainer ()            //当切换到这个场景视图后      override func didMoveToView(view: SKView ) {          //将Images.xcassets中的bg.jpg 来制作背景          var bg = SKSpriteNode (imageNamed: "bg" )          //设置位置          bg.position = CGPoint (x: CGRectGetMidX ( self .frame), y: CGRectGetMidY ( self .frame));          self .addChild(bg)                    //设置圆点容器          pointContainer.position = CGPoint (x: CGRectGetMidX ( self .frame)-10,              y: CGRectGetMidY ( self .frame)-150);          self .addChild(pointContainer)          pointContainer.onInit()                }      //响应屏幕点击的方法      override func touchesBegan(touches: NSSet , withEvent event: UIEvent ) {                } }