微信小程序实用小组件：自定义tabbar

微信小程序 自定义tabbar

创建wxml模板

<template name="tabbar">
<view class="tabbar_box" style="background-color:{{tabbar.backgroundColor}}; border-top-color:{{tabbar.borderStyle}}; {{tabbar.position == 'top' ? 'top:0' : 'bottom:0'}}">
<block wx:for="{{tabbar.list}}" wx:for-item="item" wx:key="index">
<navigator class="tabbar_nav" url="{{item.pagePath}}" style="width:{{1/tabbar.list.length*100}}%; color:{{item.selected ? tabbar.selectedColor : tabbar.color}}" open-type="redirect">
<image class="tabbar_icon" src="{{item.selected ? item.selectedIconPath : item.iconPath}}"></image>
<text>{{item.text}}</text>
</navigator>
</block>
</view>
</template>

wxss布局

.tabbar_box{
display: flex;
flex-direction: row;
justify-content: space-around;
position: fixed;
bottom: 0;
left: 0;
z-index: 999;
width: 100%;
height: 120rpx;
border-top: 1rpx solid gray;
}

.tabbar_nav{
display: flex;
flex-direction: column;
justify-content: center;
align-items: center;
font-size: 28rpx;
height: 100%;
}

.tabbar_icon{
width: 61rpx;
height: 61rpx;
}

布局不是重点也可以自定义布局也可以引用我写好的样式

重点来了
tabbar的参数配置

tabbar:{
color: "#000000",
selectedColor: "#0f87ff",
backgroundColor: "#ffffff",
borderStyle: "black",
list: [
{
pagePath: "/pages/tabbar/tabbar",
text: "项目",
iconPath: "/images/item.png",
selectedIconPath: "/images/item_HL.png",
selected: true
},
{
pagePath: "/pages/address/address",
text: "通讯录",
iconPath: "/images/ts.png",
selectedIconPath: "/images/ts1.png",
selected: false
},
{
pagePath: "/pages/personal/personal",
text: "文件",
iconPath: "/images/wjj.png",
selectedIconPath: "/images/wjj1.png",
selected: false
}
],
position: "bottom"
}

有没有感觉很熟悉，没错就是你熟悉的tababar配置，仅仅增加了一个selected参数来表示选中的状态
另外一点要注意的是我们的tabbar数据配置在app.js里面而不是app.json里面

最后还有一个比较重要的点
在app.js里面的一个函数

editTabBar: function(){
var tabbar = this.globalData.tabbar,
currentPages = getCurrentPages(),
_this = currentPages[currentPages.length - 1],
pagePath = _this.__route__;
(pagePath.indexOf('/') != 0) && (pagePath = '/' + pagePath);
for(var i in tabbar.list){
tabbar.list[i].selected = false;
(tabbar.list[i].pagePath == pagePath) && (tabbar.list[i].selected = true);
}
_this.setData({
tabbar: tabbar
});
},

我们完整的app.js是这样的

//app.js
App({
onLaunch: function () {
//调用API从本地缓存中获取数据
var logs = wx.getStorageSync('logs') || []
logs.unshift(Date.now())
wx.setStorageSync('logs', logs)
},
getUserInfo:function(cb){
var that = this
if(this.globalData.userInfo){
typeof cb == "function" && cb(this.globalData.userInfo)
}else{
//调用登录接口
wx.login({
success: function () {
wx.getUserInfo({
success: function (res) {
that.globalData.userInfo = res.userInfo
typeof cb == "function" && cb(that.globalData.userInfo)
}
})
}
})
}
},
editTabBar: function(){
var tabbar = this.globalData.tabbar,
currentPages = getCurrentPages(),
_this = currentPages[currentPages.length - 1],
pagePath = _this.__route__;
(pagePath.indexOf('/') != 0) && (pagePath = '/' + pagePath);
for(var i in tabbar.list){
tabbar.list[i].selected = false;
(tabbar.list[i].pagePath == pagePath) && (tabbar.list[i].selected = true);
}
_this.setData({
tabbar: tabbar
});
},
globalData:{
userInfo:null,
tabbar:{
color: "#000000",
selectedColor: "#0f87ff",
backgroundColor: "#ffffff",
borderStyle: "black",
list: [
{
pagePath: "/pages/tabbar/tabbar",
text: "项目",
iconPath: "/images/item.png",
selectedIconPath: "/images/item_HL.png",
selected: true
},
{
pagePath: "/pages/address/address",
text: "通讯录",
iconPath: "/images/ts.png",
selectedIconPath: "/images/ts1.png",
selected: false
},
{
pagePath: "/pages/personal/personal",
text: "文件",
iconPath: "/images/wjj.png",
selectedIconPath: "/images/wjj1.png",
selected: false
}
],
position: "bottom"
}}
})

生成的东西我没有删掉

到这准备工作已经完成
 下面就是怎么使用

在wxml引入创建的模板并使用

<import src="../tabbar/tabbar.wxml"/>
<template is="tabbar" data="{{tabbar}}"/>

我这里是相对路径，最好写成绝对路径

wxss中引入样式

@import "/pages/tabbar/tabbar.wxss"

js中调用函数

//获取app实例
var app = getApp();

Page({
data:{
tabbar:{}
},
onLoad:function(options){
// 页面初始化 options为页面跳转所带来的参数

   //调用函数
   app.editTabBar();
},
onReady:function(){
// 页面渲染完成
},
onShow:function(){
// 页面显示
},
onHide:function(){
// 页面隐藏
},
onUnload:function(){
// 页面关闭
}
})

注意在每个配置在tabbar中的页面都要有这三步，因为这个是页面跳转了
还有一个问题就是页面跳转的时候会闪一下，网络慢的时候更明显
后面我会做一个不是跳转页面的tabbar