关于微信小程序自定义tabbar问题详析
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1、首先按照官方组件在app.json中定义tabbar
"tabBar": {
"custom": true,
"backgroundColor": "#FFFFFF",
"borderStyle": "white",
"list": [
{
"pagePath": "pages/index/index",
"text": "首页",
"iconPath": "./images/home.png",
"selectedIconPath": "./images/home.png"
},
{
"pagePath": "pages/me/me",
"text": "个人中心",
"iconPath": "./images/me.png",
"selectedIconPath": "./images/me.png"
}
]
},
"usingComponents": {}2、在项目根目录创建自定义tabbar组件
划重点：根目录，请看下图，不放根目录会导致this.getTabBar = null
3、组件内容如下：
- custom-tab-bar/index.js
Component({
data: {
selected: 0,
color: "#7A7E83",
selectedColor: "#3cc51f",
list: [{
pagePath: "../../pages/index/index",
iconPath: "../images/home.png",
selectedIconPath: "../images/home.png",
text: "首页"
}, {
pagePath: "../../pages/me/me",
iconPath: "../images/me.png",
selectedIconPath: "../images/me.png",
text: "个人中心"
}]
},
attached() {
},
methods: {
switchTab(e) {
const data = e.currentTarget.dataset
const url = data.path
wx.switchTab({url})
this.setData({
selected: data.index
})
}
}
})- custom-tab-bar/index.json
{
"component": true
}- custom-tab-bar/index.wxml
<cover-view class="tab-bar">
<cover-view class="tab-bar-border"></cover-view>
<cover-view wx:for="{{list}}" wx:key="index" class="tab-bar-item" data-path="{{item.pagePath}}" data-index="{{index}}" bindtap="switchTab">
<cover-image class="lazy" data-src="{{selected === index ? item.selectedIconPath : item.iconPath}}"></cover-image>
<cover-view style="color: {{selected === index ? selectedColor : color}}">{{item.text}}</cover-view>
</cover-view>
</cover-view>- custom-tab-bar/index.wxss
.tab-bar {
position: fixed;
bottom: 0;
left: 0;
right: 0;
height: 48px;
background: white;
display: flex;
padding-bottom: env(safe-area-inset-bottom);
}
.tab-bar-border {
background-color: rgba(0, 0, 0, 0.33);
position: absolute;
left: 0;
top: 0;
width: 100%;
height: 1px;
transform: scaleY(0.5);
}
.tab-bar-item {
flex: 1;
text-align: center;
display: flex;
justify-content: center;
align-items: center;
flex-direction: column;
}
.tab-bar-item cover-image {
width: 27px;
height: 27px;
}
.tab-bar-item cover-view {
font-size: 10px;
}4、在pages下的各个页面组件引入tabbar
以首页举例：
- pages/index.json
{
"usingComponents": {
"custom-tab-bar": "../../custom-tab-bar/index"
}
}- pages/index.js
Page({
onShow: function () {
if (typeof this.getTabBar === 'function' && this.getTabBar()) {
this.getTabBar().setData({
selected: 0
})
}
}
})- pages/index.wxml
<view class="container">
<custom-tab-bar></custom-tab-bar>
</view>总结
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