IOS示例：

 

安卓示例：

 

 高斯模糊示例：

WXML代码：

<view class="tabbar">
    <view style="{{select==index&&index==0?'color: #ef3166;':''}}"
        class="tabbar-item {{ select === index ? 'tabbar-select' : '' }}" wx:for="{{ list }}" 
        wx:key="index"
        data-page="{{ item.pagePath }}"
        data-index="{{ index }}"
        bindtap="selectPage"
    >
        <block>
            <image class="tabbar-item-image"src="{{ select === index ?  item.selectedIconPath : item.iconPath }}"></image>
            <text  class="tabbar-item-text">{{ item.text }}</text>
        </block>
    </view>
</view>

 js代码：

Component({
  data: {
      select: 0,
      list: [
          {
            iconPath: "/asset/imge/hu.png",
            selectedIconPath: "/asset/imge/hu-fill.png",
            pagePath: "/pages/index/index",
            text: "心动"
          },
         {
            iconPath: "/asset/imge/per.png",
            selectedIconPath: "/asset/imge/per-fill.png",
            pagePath: "/pages/my/my",
            text: "我的"
         }
      ]
  },
  methods: {
      selectPage(e) {
          const { page } = e.currentTarget.dataset;
          wx.switchTab({
            url: page,
          })
      }
  }
})

wxss代码：

高斯模糊代码

backdrop-filter: blur(10px);

background-color: rgb(0 0 0 / .10);

.tabbar {
  width: 100%;
  display: flex;
  backdrop-filter: blur(10px);
  background-color: rgb(0 0 0 / .10);
  position: fixed;
  bottom: 0;
  padding-top: 10rpx;
  z-index: 9999;
  box-shadow: 0rpx -2rpx 20rpx 2rpx rgba(165,165,165,0.34);
  background-color: rgba(238, 238, 238, 0.89);
  padding-bottom: 20rpx;
}

.tabbar-item {
  flex: 1;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  color: #7c7c7c;
}

.tabbar-item-image {
  width: 50rpx;
  height: 50rpx;
}

.tabbar-item-text {
  font-size: 28rpx;
  margin-top: 1rpx;
}

.tabbar-select {
  color: #0a993a;
}

page 路由页面代码

例如：我的

js代码中需要加入该函数，select 根据索引属性填数值就行

/**
   * 生命周期函数--监听页面显示
   */
  onShow(){
    if (typeof this.getTabBar === 'function' &&
      this.getTabBar()) {
      this.getTabBar().setData({
        // 根据tab的索引顺序是1
        select: 1    
      }) 
    }
  },