微信小程序开发圆形菜单(仿建行圆形菜单)

本篇文章主要介绍了微信小程序开发之圆形菜单仿建行圆形菜单实例，具有一定的参考价值，有需要的可以了解一下。

建行APP首页有个圆形菜单.仿了个玩具出来.

功能介绍:

1.一个圆形背景.六个item菜单.中间是微信用户的头像;

2.触摸滚动.速度较小时,随手指滚动,手指抬起,滚动停止;速度较大时,随手指滚动,手指抬起,还会自动滚动一段时间;

上一张真机截图:

上代码:

1.index.js

var app = getApp()
Page({
 data: {
  userInfo: {},
  menuList: {},//菜单集合
  animationData: {},
  startPoint: {},//触摸开始
  dotPoint: {},//圆点坐标
  startAngle: 0,//开始角度
  tempAngle: 0,//移动角度
  downTime: 0,//按下时间
  upTime: 0,//抬起时间
  // isRunning: false,//正在滚动
 },
 onLoad: function () {
  var that = this
  //调用应用实例的方法获取全局数据
  app.getUserInfo(function (userInfo) {
   //更新数据
   that.setData({
    userInfo: userInfo,
   })
  })
  wx.getSystemInfo({
   success: function (res) {
    var windowWidth = res.windowWidth * 0.5;
    that.setData({
     //圆点坐标,x为屏幕一半,y为半径与margin-top之和,px
     //后面获取的触摸坐标是px,所以这里直接用px.
     dotPoint: { clientX: windowWidth, clientY: 250 }
    })
   }
  })
 },
 onReady: function (e) {
  var that = this;
  app.menuConfig = {
   menu: [
    { 'index': 0, 'menu': '我的账户', 'src': '../images/account.png' },
    { 'index': 1, 'menu': '信用卡', 'src': '../images/card.png' },
    { 'index': 2, 'menu': '投资理财', 'src': '../images/investment.png' },
    { 'index': 3, 'menu': '现金贷款', 'src': '../images/loan.png' },
    { 'index': 4, 'menu': '特色服务', 'src': '../images/service.png' },
    { 'index': 5, 'menu': '转账汇款', 'src': '../images/transfer.png' }
   ]
  }
  // 绘制转盘
  var menuConfig = app.menuConfig.menu,
   len = menuConfig.length,
   menuList = [],
   degNum = 360 / len // 文字旋转 turn 值
  for (var i = 0; i < len; i++) {
   menuList.push({ deg: i * degNum, menu: menuConfig[i].menu, src: menuConfig[i].src });
   console.log("menu:" + menuConfig[i].menu)
  }
  that.setData({
   menuList: menuList
  });
 },
 // 菜单拖动的三个方法
 buttonStart: function (e) {
  this.setData({
   startPoint: e.touches[0]
  })
  var x = this.data.startPoint.clientX - this.data.dotPoint.clientX;
  var y = this.data.startPoint.clientY - this.data.dotPoint.clientY;
  var startAngle = Math.asin(y / Math.hypot(x, y)) * 180 / Math.PI;
  this.setData({
   startAngle: startAngle
  })

 },
 buttonMove: function (e) {
  //获取滑动时的时间
  var downTime = Date.now();
  this.setData({
   downTime: downTime
  })
  var that = this;
  var endPoint = e.touches[e.touches.length - 1]
  //根据触摸位置计算角度
  var x = endPoint.clientX - this.data.dotPoint.clientX;
  var y = endPoint.clientY - this.data.dotPoint.clientY;
  var moveAngle = Math.asin(y / Math.hypot(x, y)) * 180 / Math.PI
  var quadrant = 1;
  if (x >= 0) {
   quadrant = y >= 0 ? 4 : 1;
  } else {
   quadrant = y >= 0 ? 3 : 2;
  }
  var tempAngle = 0;
  // 如果是一、四象限，则直接end角度-start角度，角度值都是正值 
  if (quadrant == 1 || quadrant == 4) {
   tempAngle += moveAngle - this.data.startAngle;
  } else
  // 二、三象限，色角度值是负值 
  {
   tempAngle += this.data.startAngle - moveAngle;
  }
  var menuConfig = app.menuConfig.menu;
  var menuList = [];
  for (var i = 0; i < this.data.menuList.length; i++) {
   menuList.push({ deg: this.data.menuList[i].deg + tempAngle, menu: menuConfig[i].menu, src: menuConfig[i].src });
  }
  this.setData({
   menuList: menuList
  })
  //重置开始角度
  this.setData({
   startPoint: e.touches[e.touches.length - 1]
  })
  var endX = this.data.startPoint.clientX - this.data.dotPoint.clientX;
  var endY = this.data.startPoint.clientY - this.data.dotPoint.clientY;
  var startAngle = Math.asin(endY / Math.hypot(endX, endY)) * 180 / Math.PI;
  this.setData({
   startAngle: startAngle,
   tempAngle: tempAngle
  })
 },
 buttonEnd: function (e) {
  // 计算，每秒移动的角度 
  var that = this;
  var upTime = Date.now();
  var angleSpeed = this.data.tempAngle * 1000 / (upTime - this.data.downTime);
  if (Math.abs(angleSpeed) < 100) {
   //速度小于100时,停止滚动
   return
  } else {
   //速度大于100时,自动滚动
   if (angleSpeed > 0) {
    if (angleSpeed > 500) angleSpeed = 500
    var animationRun = wx.createAnimation({
     duration: 2000,
     //ease-out结束时减速
     timingFunction: 'ease-out'
    })
    that.animationRun = animationRun
    animationRun.rotate(angleSpeed).step()
    that.setData({
     animationData: animationRun.export(),
    })
   }
   else {
    if (angleSpeed < -500) angleSpeed = -500
    angleSpeed = Math.abs(angleSpeed);
    var animationRun = wx.createAnimation({
     duration: 2000,
     // ease-out结束时减速
     timingFunction: 'ease-out'
    })
    that.animationRun = animationRun
    animationRun.rotate(-angleSpeed).step()
    that.setData({
     animationData: animationRun.export(),
    })
   }
  }
 }
})

2.index.wxml

<view class="circle-out">
 <view class="circle-in">
  <image class="userinfo-avatar" src="{{userInfo.avatarUrl}}"></image>
  <view class="menu-list" catchtouchmove="buttonMove" catchtouchstart="buttonStart" catchtouchend="buttonEnd">
   <view class="menu-item" wx:for="{{menuList}}" wx:key="unique" animation="{{animationData}}">
    <view class="menu-circle-item" style="-webkit-transform: rotate({{item.deg}}deg);" data-menu="{{item.menu}}">
     <image class="image-style" src="{{item.src}}"></image>
    </view>
    <view class="menu-circle-text-item" style="-webkit-transform: rotate({{item.deg}}deg);">
     <text class="text-style">{{item.menu}}</text>
    </view>
   </view>
  </view>
 </view>
</view>

3.index.wxss

page {
 background-image: url('http://ac-ejx0nsfy.clouddn.com/ac767407f474e1c3970a.jpg');
 background-attachment: fixed;
 background-repeat: no-repeat;
 background-size: cover;
}

.circle-out {
 margin: 75px auto;
 position: relative;
 width: 350px;
 height: 350px;
 border-radius: 50%;
 background-color: #415cab;
}

.userinfo-avatar {
 width: 70px;
 height: 70px;
 border-radius: 50%;
 position: absolute;
 top: 0;
 bottom: 0;
 left: 0;
 right: 0;
 margin: auto;
}

/**子控件的透明度等于父控件透明度*子控件透明度,父控件的opacity设置后,
所以子控件opacity设置为1依然无效,必须分离开
*/

.circle-in {
 position: absolute;
 width: 330px;
 height: 330px;
 border-radius: 50%;
 top: 0;
 bottom: 0;
 left: 0;
 right: 0;
 margin: auto;
 background-color: #fff;
}

/**菜单*/

.menu-list {
 position: absolute;
 left: 0;
 top: 0;
 width: inherit;
 height: inherit;
}

.menu-item {
 position: absolute;
 left: 0;
 top: 0;
 width: 100%;
 height: 100%;
 font-weight: 500;
}

.menu-circle-item {
 -webkit-transform-origin: 50% 150px;
 transform-origin: 50% 150px;
 margin: 0 auto;
 margin-top: 15px;
 position: relative;
 height: 50px;
 width: 50px;
 background-color: #77c2fc;
 text-align: center;
 border-radius: 50%;
}

.image-style {
 height: 25px;
 width: 25px;
 color: #f00;
 margin: 12.5px auto;
}

.text-style {
 margin: 5px auto;
 font-size: 15px;
}

/***/

.menu-circle-text-item {
 -webkit-transform-origin: 50% 100px;
 transform-origin: 50% 100px;
 margin: 0 auto;
 position: relative;
 height: 25px;
 width: auto;
 text-align: center;
}

js注释补充:

获取手指抬起时的角速度

1.获取角度.借图说话.

Math.sqrt( x * x + y * y )是斜边长，乘以 sin a 就是 y 的长度；

获取a的角度：Math.asin(y / Math.hypot(x, y) ；

[ hypot是x * x + y * y ]

2.根据角度差计算角速度

var angleSpeed = this.data.tempAngle * 1000 / (upTime - this.data.downTime);

3.当角速度小于100的时候触摸滑动停止,不自动滚动;大于100时,自动滚动.我这里用动画,有个问题:很难把握动画持续时间和速度的关系.总感觉不够流畅.我表示不能忍.

4.分象限的问题.看看代码就知道了.主要是根据up时的触摸点相对于圆点的X轴差值来计算.大于0就是一四象限.小于0就是二三象限.

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