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.PIvar 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 = 500var animationRun = wx.createAnimation({duration: 2000,//ease-out结束时减速timingFunction: 'ease-out'})that.animationRun = animationRunanimationRun.rotate(angleSpeed).step()that.setData({animationData: animationRun.export(),})}else {if (angleSpeed < -500) angleSpeed = -500angleSpeed = Math.abs(angleSpeed);var animationRun = wx.createAnimation({duration: 2000,// ease-out结束时减速timingFunction: 'ease-out'})that.animationRun = animationRunanimationRun.rotate(-angleSpeed).step()that.setData({animationData: animationRun.export(),})}} }})

2.index.wxml

<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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