uni-app自定义底部tabbar

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1.新建custom-tab-bar目录 ，并分别创建 (js，json,wxml,wxss）
index.json

{
  "component": true
}

index.wxml

<view class="tab-bar">
  <view wx:for="{{list}}" wx:key="index" class="tab-bar-item {{item.diyClass}}" data-path="{{item.pagePath}}" data-index="{{index}}" bindtap="switchTab">
    <image src="{{selected === index ? item.selectedIconPath : item.iconPath}}" class="{{item.diyClass}}"  mode="aspectFit"/>
    <view style="color: {{selected === index ? selectedColor : color}}" class="{{item.diyClass}}">{{item.text}}</view>
  </view>
</view>

index.wxss

/*重新样式*/
.tab-bar {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  display: flex;
  box-shadow: 0px -2px 10px 0px rgba(0,0,0,0.05);
  box-sizing: content-box;
}

.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: auto;
  text-align: center;
  display: flex;
  justify-content: center;
  align-items: center;
  flex-direction: column;
  background: #fff;
  height: 120rpx;
}

.tab-bar-item.diy {
  margin-top: 0!important;
  background: transparent;
  position: relative;
  flex: inherit;
  width: 134rpx;
}

.tab-bar-item image {
  width: 48rpx;
  height: 48rpx;
  overflow: initial;
}

.tab-bar-item view {
  font-size: 24rpx;
}

.tab-bar-item image.diy {
  position: absolute;
  width: 134rpx;
  height: 140rpx;
  bottom: 25.6%;
  z-index: 100;
}

.tab-bar-item view.diy {
  margin-top: 90rpx;
  background: #fff;
  width: 100%;
  height: 100%;
  padding-top: 58rpx;
  z-index: 99;
}

index.js

const app = getApp()
Component({
	data: {
		selected: 0, //当前选中的tab下标
		color: "#1E1E1E",
		selectedColor: "#2B71F2", //tabbar选中字体颜色
		list: [{
				pagePath: "pages/home/index",
				text: "首页",
				iconPath: "/static/home.png",
				selectedIconPath: "/static/home_active.png"
			},
			{
				pagePath: "pages/home/popularScience",
				text: "科普",
				iconPath: "/static/popularScience.png",
				selectedIconPath: "/static/popularScience_active.png"
			},
			{
				pagePath: "pages/home/report",
				text: "报告",
				iconPath: "/static/report.png",
				selectedIconPath: "/static/report.png"
			},
			{
				pagePath: "pages/home/ai",
				text: "AI检测",
				iconPath: "/static/ai.png",
				selectedIconPath: "/static/ai_active.png"
			},
			{
				pagePath: "pages/mine/index",
				text: "我的",
				iconPath: "/static/mine.png",
				selectedIconPath: "/static/mine_active.png"
			}
		], //tabbar循环数据集
	},
	attached() {},
	methods: {
		
		switchTab(e) {
			console.log(e)
			const data = e.currentTarget.dataset;
			const url = data.path
			this.setData({
				selected: data.index
			})

				wx.switchTab({
					url: "/" + url
				})
		},
	
	},
})

main.js中添加，解决点击两次才能选择icon

Vue.mixin({
    methods:{
		
        setTabBarIndex(index) {
            if (typeof this.$mp.page.getTabBar === 'function' &&
            this.$mp.page.getTabBar()) {
                this.$mp.page.getTabBar().setData({
                    selected: index
                })
            }
        }
    }
})

在当前页下，onShow中添加

	onShow() {
		 if (typeof this.$mp.page.getTabBar === 'function' &&
				        this.$mp.page.getTabBar()) {
				        this.$mp.page.getTabBar().setData({
				          selected: 0
				        })
				      } 
		}

​