微信小程序自定义导航栏（带汉堡包菜单）
1.在app.json中 window配置navigationStyle
(如果单独页面使用，可在页面的json文件配置)
2.计算相关值
整个导航栏的高度；
胶囊按钮与顶部的距离；
胶囊按钮与右侧的距离。
小程序可以通过 wx.getMenuButtonBoundingClientRect() 获取胶囊按钮的信息 和 wx.getSystemInfo() 获取设备信息
通过这些信息我们可以计算出上面说的3个值：
整个导航栏高度 = statausBarHeight + height + (top-statausBarHeight )*2；
胶囊按钮与顶部的距离 = top；
胶囊按钮与右侧的距离 = windowWidth - right。
App.js 代码如下：
3.头部组件navBar
navBar.wxml
<view class="navbar" style="height:{{navHeight}}px;"><view class="navbar_left" style="top:{{navTop}}px;" wx:if="{{showNav}}"><view class="btn" bindtap="navBack"><text class="iconfont icon-jiantouzuo"></text> </view><view class="nav_line"></view><view class="btn" bindtap="navMenu" wx:if="{{showHome}}"><text class="iconfont icon-hanbaobao"></text> </view></view><!-- 中间标题 --><view class="navbar_title" style="top:{{navTop}}px;">{{pageName}}</view><!-- 弹出菜单 --><view class="modal-mask" wx:if='{{isMask}}' catchtouchmove="preventTouchMove" bindtap="hiddenMask"></view><view wx:if="{{isMask}}" class="maskMenu" style="top:{{navHeight+8}}px"><view></view><view><view bindtap="navIndex"><text style="color:#222; margin-right:10rpx;font-size:36rpx;" class="iconfont icon-shouye2"></text><text>首页</text></view><view></view><view bindtap="navUser"> <text style="color:#222; margin-right:10rpx;font-size:36rpx;" class="iconfont icon-wode"></text><text>我的</text></view></view></view></view>
navBar.wxss
.navbar {width: 100%;/* overflow: hidden; */position: fixed;top: 0;left: 0;z-index: 10;background: #fff;}.navbar_left{/* width: 170rpx; */display: flex;align-items: center;justify-content: space-around;position: absolute;left: 10px;z-index: 11;padding: 6rpx 20rpx 6rpx 10rpx;border:1rpx solid #f0f0f0;border-radius: 40rpx;overflow: hidden;background: rgba(255,255,255,0.6);}.btn{width: 50rpx;height: 50rpx;line-height: 50rpx;text-align: center;}.nav_line{width: 2rpx;height: 40rpx;background: #f0f0f0;margin: 0 10rpx;}.navbar_title{width: 100%;box-sizing: border-box;padding-left: 115px;padding-right: 115px;height: 32px;line-height: 32px;text-align: center;position: absolute;left: 0;z-index: 10;color: #222;font-size: 36rpx;text-overflow: ellipsis;overflow: hidden;white-space: nowrap;}.modal-mask {width: 100%; height: 100%; position: fixed; top: 0; left: 0; background: #000; opacity: 0; overflow: hidden; z-index: 9;}.maskMenu{position: absolute;left: 25rpx; z-index: 10;}.maskMenu>view:nth-child(1){position: absolute;top: -11rpx; background: #fff; left: 85rpx; width: 30rpx;height: 30rpx;box-shadow:-2rpx -2rpx 2rpx 0rpx rgba(0,0,0,0.25); transform:rotate(45deg);}.maskMenu>view:nth-child(2){width:200rpx;height:153rpx;background:rgba(255,255,255,1);box-shadow:0rpx 2rpx 10rpx 0rpx rgba(0,0,0,0.45);border-radius: 10rpx;padding: 10rpx 0rpx 10rpx 20rpx; border-color: #ccc;display: flex; flex-direction: column;justify-content: space-around;font-size: 28rpx;color: #222222;}.maskMenu>view:nth-child(2)>view{display: flex;align-items: center; }.maskMenu>view:nth-child(2)>view:nth-child(2){width: 100%;height: 2rpx;background: #ccc; }
navBar.js
const App = getApp();Component({/*** 组件的属性列表*/properties: {pageName: String, //中间的titleshowNav: {//判断是否显示左上角的按钮 type: Boolean,value: true},showHome: {//判断是否显示左上角的home按钮type: Boolean,value: true}},/*** 组件的初始数据*/data: {showNav: true,//判断是否显示左上角的home按钮showHome: true,//判断是否显示左上角的按钮isMask: false,},lifetimes: {// 生命周期函数，可以为函数，或一个在methods段中定义的方法名attached: function () {this.setData({navHeight: App.globalData.navHeight,navTop: App.globalData.navTop})}},/*** 组件的方法列表*/methods: {/*** 弹出框蒙层截断touchmove事件*/preventTouchMove: function () {return},//回退navBack: function () {wx.navigateBack()},//菜单navMenu: function () {this.setData({isMask : !this.data.isMask})},hiddenMask :function(){this.setData({isMask : false})},navIndex :function(){wx.switchTab({url: '../../pages/index/index',})},navUser: function () {wx.switchTab({url: '../../pages/user/user',})}}})
navBar.json
{"component" : true,"usingComponents" : {}}
4.index中
index.json
index.wxml
<view class="view-page"><navbar page-name="你当前页面的名字" show-nav="{{showNav}}" show-home="{{showHome}}"></navbar><view class='page-content' style="margin-top:{{navHeight}}px;"><!--这里放你的内容--></view></view>
index.js
const app = getApp()Page({data:{navHeight: app.globalData.navHeight,showNav:true,showHome:true,})}
效果图
