天猫超市翻牌的转盘经常用,以前做Android,没啥想法,现在尝试微信小程序,看到别人家APP里有啥好玩的,就想去做一个.
上GIF看效果:

简要的说一下.

1.外面一圈闪烁的小球是用js控制的样式.500ms改变一次样式.简单粗暴;
2.抽奖的item也是js控制背景,但是怎么样让它优雅的停下来是个问题.动画中有timingFunction可以设置速度.自己用js就没那么简单了.我这里用setInterval(),时间是线性变化的.换个斜率先小后大的函数效果应该会好一些.

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注释写了一些,凑合这看吧.有不对的地方,
欢迎批评!
上代码:
1.index.wxml

<view class="container-out"> <view class="circle" wx:for="{ { circleList}}" style="top:{ { item.topCircle}}rpx;left:{ { item.leftCircle}}rpx;background-color: { {(index%2==0)?colorCircleFirst:colorCircleSecond}};"></view> <view class="container-in"> <view class="content-out" wx:for="{ { awardList}}" style="top:{ { item.topAward}}rpx;left:{ { item.leftAward}}rpx;background-color: { {(index==indexSelect)?colorAwardSelect:colorAwardDefault}};"> <image class="award-image" src="{ { item.imageAward}}"></image> </view> <view class="start-btn" bindtap="startGame" style=" background-color:{ { isRunning?'#e7930a':'#ffe400'}}">START</view> </view> </view>

2.index.wxss

.container-out { height: 600rpx; width: 650rpx; background-color: #b136b9; margin: 100rpx auto; border-radius: 40rpx; box-shadow: 0 10px 0 #871a8e; position: relative; }

.container-in { width: 580rpx; height: 530rpx; background-color: #871a8e; border-radius: 40rpx; position: absolute; left: 0; right: 0; top: 0; bottom: 0; margin: auto; }

/**小圆球 box-shadow: inset 3px 3px 3px #fff2af;*/

.circle { position: absolute; display: block; border-radius: 50%; height: 20rpx; width: 20rpx; }

.content-out { position: absolute; height: 150rpx; width: 166.6666rpx; background-color: #f5f0fc; border-radius: 15rpx; box-shadow: 0 5px 0 #d87fde; }

/**居中 加粗*/

.start-btn { position: absolute; margin: auto; top: 0; left: 0; bottom: 0; right: 0; border-radius: 15rpx; height: 150rpx; width: 166.6666rpx; background-color: #ffe400; box-shadow: 0 5px 0 #e7930a; color: #f6251e; text-align: center; font-size: 55rpx; font-weight: bolder; line-height: 150rpx; }

.award-image { position: absolute; margin: auto; top: 0; left: 0; bottom: 0; right: 0; height: 140rpx; width: 130rpx; }

3.index.js

Page({
  data: {
    circleList: [],//圆点数组
    awardList: [],//奖品数组
    colorCircleFirst: '#FFDF2F',//圆点颜色1
    colorCircleSecond: '#FE4D32',//圆点颜色2
    colorAwardDefault: '#F5F0FC',//奖品默认颜色
    colorAwardSelect: '#ffe400',//奖品选中颜色
    indexSelect: 0,//被选中的奖品index
    isRunning: false,//是否正在抽奖
    imageAward: [
      '../../images/1.jpg',
      '../../images/2.jpg',
      '../../images/3.jpg',
      '../../images/4.jpg',
      '../../images/5.jpg',
      '../../images/6.jpg',
      '../../images/7.jpg',
      '../../images/8.jpg',
    ],//奖品图片数组
  },

  onLoad: function () { 
    var _this = this;
    //圆点设置
    var leftCircle = 7.5;
    var topCircle = 7.5;
    var circleList = [];
    for (var i = 0; i < 24; i++) {
      if (i == 0) {
        topCircle = 15;
        leftCircle = 15;
      } else if (i < 6) {
        topCircle = 7.5;
        leftCircle = leftCircle + 102.5;
      } else if (i == 6) {
        topCircle = 15
        leftCircle = 620;
      } else if (i < 12) {
        topCircle = topCircle + 94;
        leftCircle = 620;
      } else if (i == 12) {
        topCircle = 565;
        leftCircle = 620;
      } else if (i < 18) {
        topCircle = 570;
        leftCircle = leftCircle - 102.5;
      } else if (i == 18) {
        topCircle = 565;
        leftCircle = 15;
      } else if (i < 24) {
        topCircle = topCircle - 94;
        leftCircle = 7.5;
      } else {
        return
      }
      circleList.push({ topCircle: topCircle, leftCircle: leftCircle });
    }
    this.setData({
      circleList: circleList
    })
    //圆点闪烁
    setInterval(function () { 
      if (_this.data.colorCircleFirst == '#FFDF2F') {
        _this.setData({
          colorCircleFirst: '#FE4D32',
          colorCircleSecond: '#FFDF2F',
        })
      } else {
        _this.setData({
          colorCircleFirst: '#FFDF2F',
          colorCircleSecond: '#FE4D32',
        })
      }
    }, 500)
    //奖品item设置
    var awardList = [];
    //间距,怎么顺眼怎么设置吧.
    var topAward = 25;
    var leftAward = 25;
    for (var j = 0; j < 8; j++) {
      if (j == 0) {
        topAward = 25;
        leftAward = 25;
      } else if (j < 3) {
        topAward = topAward;
        //166.6666是宽.15是间距.下同
        leftAward = leftAward + 166.6666 + 15;
      } else if (j < 5) {
        leftAward = leftAward;
        //150是高,15是间距,下同
        topAward = topAward + 150 + 15;
      } else if (j < 7) {
        leftAward = leftAward - 166.6666 - 15;
        topAward = topAward;
      } else if (j < 8) {
        leftAward = leftAward;
        topAward = topAward - 150 - 15;
      }
      var imageAward = this.data.imageAward[j];
      awardList.push({ topAward: topAward, leftAward: leftAward, imageAward: imageAward });
    }
    this.setData({
      awardList: awardList
    })
  },
  //开始游戏
  startGame: function () { 
    if (this.data.isRunning) return
    this.setData({
      isRunning: true
    })
    var _this = this;
    var indexSelect = 0
    var i = 0;
    var timer = setInterval(function () { 
      indexSelect++;
      //这里我只是简单粗暴用y=30*x+200函数做的处理.可根据自己的需求改变转盘速度
      i += 30;
      if (i > 1000) {
        //去除循环
        clearInterval(timer)
        //获奖提示

        wx.showModal({
          title: '恭喜您',
          content: '获得了第' + (_this.data.indexSelect + 1) + "个优惠券",
          showCancel: false,//去掉取消按钮
          success: function (res) { 
            if (res.confirm) {
              _this.setData({
                isRunning: false
              })
            }
          }
        })
      }
      indexSelect = indexSelect % 8;
      _this.setData({
        indexSelect: indexSelect
      })
    }, (200 + i))
  }
})

demo代码下载

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原文链接：https://blog.csdn.net/qq_31383345/article/details/53504191

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