微信小程序自定义tabbar【中间凸起样式

"tabBar": {
    "custom": true,
    "color": "#515151",
    "selectedColor": "#DAA520",
    "backgroundColor": "#000000",
    "list": [
        {
            "pagePath": "pages/index/index",
            "text": "首页"
        },
        {
            "pagePath": "pages/hospital/hospital",
            "text": "医院"
        },
        {
            "pagePath": "pages/publish/publish",
            "text": "item3"
        },
        {
            "pagePath": "pages/popularization/popularization",
            "text": "科普"
        },
        {
            "pagePath": "pages/me/me",
            "text": "我的"
        }
    ]
},
"usingComponents": {},

<!--custom-tab-bar/index.wxml-->
<view class="tab-bar">
  <view wx:for="{{list}}" wx:key="index" class="tab-bar-item {{item.bulge?'bulge':''}}" data-path="{{item.pagePath}}" data-index="{{index}}" bindtap="switchTab">
    <view  wx:if="item.bulge" class="tab-bar-bulge"></view>
    <image class="image" src="{{selected === index ? item.selectedIconPath : item.iconPath}}"></image>
    <!-- <view  wx:if="{{item.text}}" style="color: {{selected === index ? selectedColor : color}}" class="tab-bar-view">{{item.text}}</view> -->
    <view  class="tab-bar-view" style="color: {{selected === index ? selectedColor : color}}">{{item.text}}</view>
  </view>
</view>

// custom-tab-bar/index.js
Component({
  data: {
    color: "#515151",
    selectedColor: "#DAA520",
    backgroundColor: "#ffffff",
    list: [
      {
        pagePath: "/pages/index/index",
        text: "首页",
        iconPath: "/images/tabbar/index.png",
        selectedIconPath: "/images/tabbar/index-selected.png"
      },
      {
        pagePath: "/pages/hospital/hospital",
        text: "医院",
        iconPath: "/images/tabbar/hospital.png",
        selectedIconPath: "/images/tabbar/hospital-selected.png"
      },
      {
        pagePath: "/pages/publish/publish",
        bulge:true,
        text: "发布",
        iconPath: "/images/tabbar/dog.png",
        selectedIconPath: "/images/tabbar/dog-selected.png"
      },
      {
        pagePath: "/pages/popularization/popularization",
        text: "科普",
        iconPath: "/images/tabbar/popularization.png",
        selectedIconPath: "/images/tabbar/popularization-selected.png"
      },
      {
        pagePath: "/pages/me/me",
        text: "我的",
        iconPath: "/images/tabbar/me.png",
        selectedIconPath: "/images/tabbar/me-selected.png"
      },
    ]
  },
  attached() {
  },
  methods: {
    switchTab(e) {
      const data = e.currentTarget.dataset
      const url = data.path
      wx.switchTab({url}) 
    }
  }
})

.tab-bar {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  height: 50px;
  background: #FFF;
  display: flex;
  line-height: 1.2;
  padding-bottom: env(safe-area-inset-bottom);
  border-top: 1px solid #e6e6e6;
}
.tab-bar-item {
  flex: 1;
  text-align: center;
  display: flex;
  justify-content: center;
  align-items: center;
  flex-direction: column;
}
.tab-bar-item .image {
  width: 26px;
  height: 26px;
}
.bulge {
  background-color: #FFF;
}
.bulge .tab-bar-bulge{
  position: absolute;
  z-index: -1;
  width: 64px;
  height: 64px;
  top: -24px;
  border-radius: 50%;
  border-top: 1px solid #e6e6e6;
  background-color: #FFF;
}
.bulge .image{
  position: absolute; 
  width: 50px;
  height: 50px;
  top: -16px;
}
.bulge .tab-bar-view{
  position: relative;
  bottom: -16px;
  margin-top: 4px;
}
.tab-bar-item .tab-bar-view {
  font-size: 12px;
  margin-top: 4px;
}

{
  "component": true
}

onShow: function () {
    if (typeof this.getTabBar === 'function' && this.getTabBar()) {
        this.getTabBar().setData({
            // 首页为 0
            selected: 0
        })
    }
},