首頁 > 文章 > 微信小程式 > 微信小程式開發圓形選單(仿建行圓形選單)

微信小程式開發圓形選單(仿建行圓形選單)

不言原創: 2018-06-27 09:22:233003瀏覽

本篇文章主要介紹了微信小程式開發之圓形選單仿建行圓形選單實例，具有一定的參考價值，有需要的可以了解一下。

建行APP首頁有個圓形選單.仿了個玩具出來.

#功能介紹:

1.一個圓形背景.六個item選單.中間是微信使用者的頭像;

2.觸摸滾動.速度較小時,隨手指滾動,手指抬起,滾動停止;速度較大時,隨手指滾動,手指抬起,還會自動滾動一段時間;

上一張真機截圖:

上碼:

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: [
    { &#39;index&#39;: 0, &#39;menu&#39;: &#39;我的账户&#39;, &#39;src&#39;: &#39;../images/account.png&#39; },
    { &#39;index&#39;: 1, &#39;menu&#39;: &#39;信用卡&#39;, &#39;src&#39;: &#39;../images/card.png&#39; },
    { &#39;index&#39;: 2, &#39;menu&#39;: &#39;投资理财&#39;, &#39;src&#39;: &#39;../images/investment.png&#39; },
    { &#39;index&#39;: 3, &#39;menu&#39;: &#39;现金贷款&#39;, &#39;src&#39;: &#39;../images/loan.png&#39; },
    { &#39;index&#39;: 4, &#39;menu&#39;: &#39;特色服务&#39;, &#39;src&#39;: &#39;../images/service.png&#39; },
    { &#39;index&#39;: 5, &#39;menu&#39;: &#39;转账汇款&#39;, &#39;src&#39;: &#39;../images/transfer.png&#39; }
   ]
  }
  // 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: &#39;ease-out&#39;
    })
    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: &#39;ease-out&#39;
    })
    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(&#39;http://ac-ejx0nsfy.clouddn.com/ac767407f474e1c3970a.jpg&#39;);
 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註解補充:

取得手指抬起時的角速度

#1.取得角度.借圖說話.

Math .sqrt( x * x y * y )是斜邊長，乘以sin a 就是y 的長度；

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

[ hypot是x * x y * y ]

2.根據角度差計算角速度

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

3.當角速度小於100的時候觸摸滑動停止,不自動滾動;大於100時,自動滾動.我在這裡用動畫,有個問題:很難把握動畫持續時間和速度的關係.總覺得不夠流暢.我表示不能忍.

4.分象限的問題.看看代碼就知道了.主要是根據up時的觸摸點相對於圓點的X軸差值來計算.大於0就是一四象限.小於0就是二三象限.

以上就是本文的全部內容，希望對大家的學習有所幫助，更多相關內容請關注PHP中文網！

微信小程式開發圓形選單(仿建行圓形選單)

相關文章