【微信小程序】自定义tabbar_微信小程序自定义tabbar

1、app.json中配置 tabbar

"tabBar": {
    "custom": true,
    "list":[
      {
        "pagePath": "pages/aboutFind/find/find",
        "text": "发现",
        "iconPath": "/public/image/icon_find2.png",
        "selectedIconPath": "/public/image/icon_find1.png"
      },
      {
        "pagePath": "pages/index/index",
        "text": "通行",
        "iconPath": "/public/image/icon_go2.png",
        "selectedIconPath": "/public/image/icon_go1.png"
      },
      {
        "pagePath": "pages/aboutMe/myInfo/myInfo",
        "text": "我的",
        "iconPath": "/public/image/icon_set2.png",
        "selectedIconPath": "/public/image/icon_set1.png"
      }
    ]
},
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注意添加： "custom": true

2、新建根目录文件：custom-tab-bar， 并以组件形式新增文件

注意点：文件夹要在根目录下，名字为custom-tab-bar，并且里面的每个文件名为index

（1）index.wxml

<view class="tabBar">
  <view class="cont">
    <block wx:for="{{list}}" wx:key="index" class="cont-item">
      <view data-path="{{item.pagePath}}" data-index="{{item.pagePath}}" bindtap="switchTab" class="{{item.search?'search':'item'}} {{selected === index ? 'on' : 'off'}}">
        <image src="{{selected === index  ? item.selectedIconPath : item.iconPath}}"></image>
        <view class="txt {{selected === index ? 'selectedColor' : ''}}">{{item.text}}</view>
      </view>
    </block>
  </view>
</view>
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（2）index.js

Component({
  /**
   * 组件的属性列表
   */
  properties: {

  },

  /**
   * 组件的初始数据
   */
  data: {
    selected: 0,
    color: "#fff",
    selectedColor: "#6777FD",
    list: [
      {
        pagePath: "/pages/aboutFind/find/find",
        text: "发现",
        iconPath: "/public/image/icon_find2.png",
        selectedIconPath: "/public/image/icon_find1.png"
      },
      {
        pagePath: "/pages/index/index",
        text: "通行",
        iconPath: "/public/image/icon_go2.png",
        selectedIconPath: "/public/image/icon_go1.png",
        search: true
      },
      {
        pagePath: "/pages/aboutMe/myInfo/myInfo",
        text: "我的",
        iconPath: "/public/image/icon_set2.png",
        selectedIconPath: "/public/image/icon_set1.png"
      }
    ]
  },

  /**
   * 组件的方法列表
   */
  methods: {
    switchTab(e) {
      const data = e.currentTarget.dataset
      const url = data.path
      wx.switchTab({ url })
    }
  }
})
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（3）index.json

{
  "component": true,
  "usingComponents": {}
}
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（4）index.wxss

.tabBar {
  z-index: 100;
  width: 100%;
  position: fixed;
  bottom: 0;
  font-size: 28rpx;
  background-color: #fff;
  color: #636363;
  border-radius: 50rpx 50rpx 0px 0px;
}

.cont {
  z-index: 0;
  height: calc(100rpx + env(safe-area-inset-bottom) / 2);
  padding-bottom: calc(env(safe-area-inset-bottom) / 2); 
  padding-bottom: 30rpx;
  display: flex;
  justify-content: space-around;
}

.cont .item {
  font-size: 24rpx;
  position: relative;
  width: 15%;
  text-align: center;
  padding: 0;
  display: block;
  height: auto;
  line-height: 1;
  margin: 0;
  background-color: inherit;
  overflow: initial;
  justify-content: center;
  align-items: center;
  padding-top: 20rpx;
}

.cont .item:first-child {
  right: 45rpx;
}

.cont .item:last-child {
  left: 45rpx;
}

.cont .item image:first-child {
  width: 43rpx !important;
  height: 43rpx !important;
  margin: auto
}

.cont .item image:last-child {
  width: 41rpx !important;
  height: 43rpx !important;
  margin: auto
}

.cont .txt {
  margin-top: 20rpx;
}

.cont .on {
  position: relative;
}

.cont .on:not(:nth-child(2)):before {
  content: "";
  display: block;
  position: absolute;
  top: 0;
  width: 100%;
  height: 6rpx;
  background-color: #17C2D8;
  border-radius:120rpx !important;
}

.cont .search {
  position: absolute;
  left: 50%;
  transform: translate(-50%,0);
  top: -50rpx;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
}

.cont .search image {
  width: 100rpx !important;
  height: 100rpx !important;
  z-index: 2;
  border-radius: 100%;
}

.cont .search .txt {
  margin-top: 26rpx;
}

.cont .selectedColor {
  color: #17C2D8;
}
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3、在tab页面中使用

注意：如需实现 tab 选中态，要在当前页面下，通过 getTabBar 接口获取组件实例，并调用 setData 更新选中态

（1）find 自定义tabbar

onShow() {
	if (typeof this.getTabBar === 'function' && this.getTabBar()) {
	  this.getTabBar().setData({
	    selected: 0
	  })
	}
}
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（2）index 自定义tabbar

onShow() {
	if (typeof this.getTabBar === 'function' && this.getTabBar()) {
	  this.getTabBar().setData({
	    selected: 1
	  })
	}
}
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（3）myInfo 自定义tabbar

onShow() {
	if (typeof this.getTabBar === 'function' && this.getTabBar()) {
	  this.getTabBar().setData({
	    selected: 2
	  })
	}
}
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4、效果