微信小程序实现底部导航栏tabbar

参考链接：
（1）微信小程序底部导航Tabbar
https://www.cnblogs.com/huangjialin/p/6278429.html
（2）小程序自定义tabbar实现中间图标突出效果(附带wx.hideTabBar不生效的bug解决方案)
https://www.jianshu.com/p/ce1c3c25527c
（3）微信小程序入门四: 顶部、导航栏样式、tabBar导航栏
https://blog.csdn.net/haibo0668/article/details/80651680
（4）微信小程序自定义tabbar组件点击对应区域显示凸起效果
https://blog.csdn.net/nan961136007/article/details/103913052

一、例子1

底部导航栏这个功能是非常常见的一个功能，基本上一个完成的app，都会存在一个导航栏，那么微信小程序的导航栏该怎么实现呢？经过无数的踩坑，终于实现了，好了，先看看效果图。

对于底部导航栏，小程序上给出的文档要求里面的item最少2个，最多五个。

{"pages":["pages/index/index","pages/logs/logs","pages/mine/mine"],"window":{"backgroundTextStyle":"light","navigationBarBackgroundColor": "#fff","navigationBarTitleText": "首页","navigationBarTextStyle":"black"},"tabBar": {"color": "#a9b7b7","selectedColor": "#11cd6e","borderStyle": "black" ,"list": [{"selectedIconPath": "images/icon_consult_press.png","iconPath": "images/icon_consult.png","pagePath": "pages/index/index","text": "首页"}, {"selectedIconPath": "images/icon_invest_press.png","iconPath": "images/icon_invest.png","pagePath": "pages/logs/logs","text": "一元投"},{"selectedIconPath": "images/icon_mine_press.png","iconPath": "images/icon_mine.png","pagePath": "pages/mine/mine","text": "我的"}]}
}

解释一下这些属性是什么意思：

tabBar 指底部的导航配置属性
color 未选择时底部导航文字的颜色
selectedColor 选择时底部导航文字的颜色
borderStyle 底部导航边框的样色（注意这里如果没有写入样式会导致导航框上边框会出现默认的浅灰色线条）
list 导航配置数组
selectedIconPath 选中时图标路径
iconPath 未选择时图标路径
pagePath 页面访问地址
text 导航图标下方文字

需要注意一些小问题：

每个页面的json文件都不能去掉navigationBarTitleText这个属性。否则会报错
"pages":[ "pages/index/index", "pages/logs/logs", "pages/mine/mine" ],

这个页面的注册一定要注意，第一个一定是要是最先显示的，否则会出现底部导航看不到。

二、例子2

github传送门 https://github.com/SuRuiGit/wxapp-customTabbar

集成到项目
第一步：找到项目中的tabbarComponent目录，拷贝到你的工程中，然后将tabbarComponent->icon图标替换成你自己的tabbar图片(建议把tabbarComponent目录与pages同级)

第二步：到app.json中配置tabBar，如果tabbar中间的按钮是跳到二级页面，就不要配置在tabBar的list中，如果配置了，中间的按钮点击是无效的，要注意。

第三步：在app.js的onLaunch方法中调用hidetabbar()自己封装一下，代码如下，隐藏系统自带的tabBar直接写wx.hideTabBar在安卓8.0有bug，并且在每一个用到tabbar的js文件中的onReady和onShow中调用一下app.hidetabbar()，调用getSystemInfo()方法获取设备信息，主要是为了适配iPhone X，这个方法在下面会给出。

//自己对wx.hideTabBar的一个封装
hidetabbar() {wx.hideTabBar({fail: function() {setTimeout(function() { // 做了个延时重试一次，作为保底。wx.hideTabBar()}, 500)}});},
getSystemInfo: function() {let t = this;wx.getSystemInfo({success: function(res) {t.globalData.systemInfo = res;}});},

第四步：在app.js中的globalData中加入自定义tabbar和systemInfo的参数，再加入一个方法给tabBar.list配置中的页面使用，代码如下。

editTabbar: function() {let tabbar = this.globalData.tabBar;let currentPages = getCurrentPages();let _this = currentPages[currentPages.length - 1];let pagePath = _this.route;(pagePath.indexOf('/') != 0) && (pagePath = '/' + pagePath);for (let i in tabbar.list) {tabbar.list[i].selected = false;(tabbar.list[i].pagePath == pagePath) && (tabbar.list[i].selected = true);}_this.setData({tabbar: tabbar});},
globalData: {systemInfo: null,//客户端设备信息tabBar: {"backgroundColor": "#ffffff","color": "#979795","selectedColor": "#1c1c1b","list": [{"pagePath": "/page/index/index","iconPath": "icon/icon_home.png","selectedIconPath": "icon/icon_home_HL.png","text": "首页"},{"pagePath": "/page/myRelease/index","iconPath": "icon/icon_release.png","isSpecial": true,"text": "发布"},{"pagePath": "/page/mine/index","iconPath": "icon/icon_mine.png","selectedIconPath": "icon/icon_mine_HL.png","text": "我的"}]}}

第五步：在tabBar的list中配置的页面的.js文件的data中加入tabbar:{}，并在onload方法中调用app.editTabbar();

第六步：在tabBar的list中配置的页面的.json文件中加入"usingComponents": { “tabbar”: “…/…/tabbarComponent/tabbar” }在.wxml文件中加入

第七步：修改tabbarComponent->tabbar.js->data中的代码，代码截图如下
这里就是作者的一个小bug，本来作者写的是==‘iPhone X’，在模拟器上没有问题，但是真机上返回的却不是这个字段，所以我们要改成包含

三、例子3

小程序的导航栏样式在app.json中定义。这里设置导航，背景黑色，文字白色，文字内容测试小程序
app.json内容：

{"pages":["pages/index/index","pages/login/login","pages/logs/logs"],"window":{"backgroundTextStyle":"red","navigationBarBackgroundColor": "#000","navigationBarTitleText": "测试小程序","navigationBarTextStyle":"#fff"}
}

tabBar挺好的，可以放置于顶部或者底部，用于不同功能页面的切换。tabBar同样在app.json中进行定义，看一下我在app.json中对tabBar的相关定义：

  "tabBar": {"selectedColor": "#1296db","list": [{"pagePath": "pages/index/index","text": "首页","iconPath": "images/ico-home.png","selectedIconPath": "images/ico-home-d.png"},{"pagePath": "pages/setting/setting","text": "设置","iconPath": "images/ico-setting.png","selectedIconPath": "images/ico-setting-d.png"},{"pagePath": "pages/help/help","text": "帮助","iconPath": "images/ico-help.png","selectedIconPath": "images/ico-help-d.png"}]}

四、例子4

首先呢，先创建template文件夹，里面包含wxml，wxss和 js。

wxml文件

<view class='footer'><view class='footer_list' data-current="{{0}}" bindtap="chooseImg"><image class="footer-image" hidden='{{curIdx===0}}' src="{{listInfo[0].imgUrl}}"></image><view hidden='{{curIdx!==0}}' class="tab-img"><image class="footer-image2" src="{{listInfo[0].curUrl}}"></image></view><!-- 等于该id的话图标和名称就凸起来 --><view class="footer-text">首页</view><view hidden='{{curIdx!==0}}' class="footer-text2">首页</view></view><view class='footer_list' data-current="{{1}}" bindtap="chooseImg"><image class="footer-image" hidden='{{curIdx===1}}' src="{{listInfo[1].imgUrl}}"></image><view hidden='{{curIdx!==1}}' class="tab-img"><image class="footer-image2" src="{{listInfo[1].curUrl}}"></image></view><view class="footer-text">分类</view><view hidden='{{curIdx!==1}}' class="footer-text2">分类</view></view><view class='footer_list' data-current="{{2}}" bindtap="chooseImg"><image class="footer-image" hidden='{{curIdx===2}}' src="{{listInfo[2].imgUrl}}"></image><view hidden='{{curIdx!==2}}' class="tab-img"><image class="footer-image2" src="{{listInfo[2].curUrl}}"></image></view><view class="footer-text">购物车</view><view hidden='{{curIdx!==2}}' class="footer-text2">购物车</view></view><view class='footer_list' data-current="{{3}}" bindtap="chooseImg"><image class="footer-image" hidden='{{curIdx===3}}' src="{{listInfo[3].imgUrl}}"></image><view hidden='{{curIdx!==3}}' class="tab-img"><image class="footer-image2" src="{{listInfo[3].curUrl}}"></image></view><view class="footer-text">个人中心</view><view hidden='{{curIdx!==3}}' class="footer-text2">个人中心</view></view>
</view>

wxss文件

page {background: #f8f7f6;
}
.footer {position: fixed;bottom: 0;width: 100%;height: 105rpx; /*footer的高度*/background: #fff;z-index: 500;border-top: 1rpx solid #e9e9e9;display: flex;flex-direction: row;
}
.footer_list {display: flex;flex-direction: column;align-items: center;width: 100%;height: 100%;
}
.footer-image {width: 50rpx;height: 50rpx;margin-top: 10rpx;}
.footer-image2 {width: 50rpx;height: 50rpx;margin-top: 20rpx;
}
.footer-text2 {font-size: 24rpx;margin-top: 15rpx;color: #896D59;
}
.tab-img {position: absolute;top: -36rpx;width: 96rpx;height: 96rpx;border-radius: 50%;border-top: 2rpx solid #f2f2f3;background-color: #fff;text-align: center;box-sizing: border-box;padding: 6rpx;
}
.footer-text {font-size: 24rpx;margin-top: 10rpx;color: #896D59;
}

js文件

// pages/template/template.js
Page({/*** 页面的初始数据*/data: {listInfo: [{text: '首页',imgUrl: '/pages/images/main.png',curUrl: '/pages/images/mian_lo1_on.png',},{text: '分类',imgUrl: '/pages/images/mian_lo2.png',curUrl: '/pages/images/mian_lo2_on.png',},{text: '购物车',imgUrl: '/pages/images/mian_lo3.png',curUrl: '/pages/images/mian_lo3_on.png',},{text: '个人中心',imgUrl: '/pages/images/mian_lo4.png',curUrl: '/pages/images/mian_lo4_on.png',}]},// 底部导航chooseImg: function (e) {var that = thisthis.setData({curIdx: e.currentTarget.dataset.current})console.log("kk", e.currentTarget.dataset.current)if (e.currentTarget.dataset.current == 0) {wx.switchTab({url: '/pages/index/index',})} else if (e.currentTarget.dataset.current == 1) {wx.switchTab({url: '/pages/classify/classify',})} else if (e.currentTarget.dataset.current == 2) {wx.switchTab({url: '/pages/car/car',})} else if (e.currentTarget.dataset.current == 3) {wx.switchTab({url: '/pages/person/person',})}that.onShow();},/*** 生命周期函数--监听页面加载*/onLoad: function (options) {var that = this},/*** 生命周期函数--监听页面显示*/onShow: function () {this.onLoad();},
})

app.json文件

{"pages": ["pages/index/index","pages/classify/classify","pages/car/car","pages/person/person","pages/template/template"],"window": {"backgroundTextStyle": "light","navigationBarBackgroundColor": "#fff","navigationBarTitleText": "你们项目的名字","navigationBarTextStyle": "black"},"tabBar": {"backgroundColor": "#ffffff","color": "#896D59","selectedColor": "#896D59","list": [{"pagePath": "pages/index/index","text": "首页","iconPath": "pages/images/main.png","selectedIconPath": "pages/images/mian_lo1_on.png"},{"pagePath": "pages/classify/classify","text": "分类","iconPath": "pages/images/mian_lo2.png","selectedIconPath": "pages/images/mian_lo2_on.png"},{"pagePath": "pages/car/car","text": "购物车","iconPath": "pages/images/mian_lo3.png","selectedIconPath": "pages/images/mian_lo3_on.png"},{"pagePath": "pages/person/person","text": "个人中心","iconPath": "pages/images/mian_lo4.png","selectedIconPath": "pages/images/mian_lo4_on.png"}]},"sitemapLocation": "sitemap.json"
}

app.js文件

//app.js
App({onLaunch: function () {//隐藏系统tabbarwx.hideTabBar();// 展示本地存储能力var logs = wx.getStorageSync('logs') || []logs.unshift(Date.now())wx.setStorageSync('logs', logs)// 登录wx.login({success: res => {// 发送 res.code 到后台换取 openId, sessionKey, unionId}})// 获取用户信息wx.getSetting({success: res => {if (res.authSetting['scope.userInfo']) {// 已经授权，可以直接调用 getUserInfo 获取头像昵称，不会弹框wx.getUserInfo({success: res => {// 可以将 res 发送给后台解码出 unionIdthis.globalData.userInfo = res.userInfo// 由于 getUserInfo 是网络请求，可能会在 Page.onLoad 之后才返回// 所以此处加入 callback 以防止这种情况if (this.userInfoReadyCallback) {this.userInfoReadyCallback(res)}}})}}})},onShow: function () {//隐藏系统tabbarwx.hideTabBar();},globalData: {userInfo: null}
})

app.js的重点是隐藏小程序自带的tabbar，让你自定义的组件得以显示，并且不被占位置。

然后是每个界面的引用了，你想在哪个界面显示这个tabbar，就放进去以下代码。比如index首页嘛，记得看你们的层级引用模板文件哦，不然会报错的。

wxml文件

<import src='../../template/template.wxml' />
<view><include src="/pages/template/template.wxml" />
</view>

wxss文件

@import "../template/template.wxss";

js文件

Page({data: {listInfo: [{text: '首页',imgUrl: '/pages/images/main.png',curUrl: '/pages/images/mian_lo1_on.png',},{text: '分类',imgUrl: '/pages/images/mian_lo2.png',curUrl: '/pages/images/mian_lo2_on.png',},{text: '购物车',imgUrl: '/pages/images/mian_lo3.png',curUrl: '/pages/images/mian_lo3_on.png',},{text: '个人中心',imgUrl: '/pages/images/mian_lo4.png',curUrl: '/pages/images/mian_lo4_on.png',}],// 底部导航chooseImg: function(e) {var that = thisthis.setData({curIdx: e.currentTarget.dataset.current})console.log("kk", e.currentTarget.dataset.current)if (e.currentTarget.dataset.current == 0) {wx.switchTab({url: '/pages/index/index',})} else if (e.currentTarget.dataset.current == 1) {wx.switchTab({url: '/pages/classify/classify',})} else if (e.currentTarget.dataset.current == 2) {wx.switchTab({url: '/pages/car/car',})} else if (e.currentTarget.dataset.current == 3) {wx.switchTab({url: '/pages/person/person',})}that.onShow();},onLoad: function(options) {var curIdx = 0this.setData({curIdx: curIdx,})},onShow: function() {this.onLoad();},
})