微信小程序自定义tabbar、navbar

"tabBar": {
    "custom": true,
	...
}

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

// custom-tab-bar/index.js
// 用自定义组件的方式编写即可，该自定义组件完全接管 tabBar 的渲染。另外，自定义组件新增 getTabBar 接口，可获取当前页面下的自定义 tabBar 组件实例。

Component({
  data: {
    selected: 0,
    color: "#7A7E83",
    selectedColor: "#3cc51f",
    list : [
      {
        "pagePath": "/pages/index/index",
        "text": "首页",
        "iconPath": "/assets/imgs/shouye_1.png",
        "selectedIconPath": "/assets/imgs/index-on.png"
      },
      {
        "pagePath": "/pages/cates/cates",
        "text": "分类",
        "iconPath": "/assets/imgs/fenlei.png",
        "selectedIconPath": "/assets/imgs/cates-on.png"
      },
      {
        "pagePath": "/pages/search/search",
        "text": "搜索门店",
        "iconPath": "/assets/imgs/dingwei.png",
        "selectedIconPath": "/assets/imgs/dingwei-on.png"
      },
      {
        "pagePath": "/pages/cart/cart",
        "text": "购物车",
        "iconPath": "/assets/imgs/chengxu.png",
        "selectedIconPath": "/assets/imgs/cart-on.png"
      },
      {
        "pagePath": "/pages/home/home",
        "text": "我的",
        "iconPath": "/assets/imgs/zuanshi.png",
        "selectedIconPath": "/assets/imgs/home-on.png"
      }
    ]
  },
  methods: {
    // 这里是一个自定义方法
    switchTab(e) {
      const data = e.currentTarget.dataset
      const url = data.path
      wx.switchTab({url})
      // this.setData({
      //   selected: data.index
      // })
    },
  },

})
  

{
  "component": true
}

 .active{
  color: #FF6601;
}
 .tab-bar {
  position: fixed;
  z-index: 999;
  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 image {
  width: 27px;
  height: 27px;
}

.tab-bar-item view {
  font-size: 10px;
}

注：在tab页面的onshow方法内，定义以下 解决路径跳转图标不跳转问题

  onShow: function () {
    if (typeof this.getTabBar === 'function' &&
    this.getTabBar()) {
    this.getTabBar().setData({
      selected: 3
    })
  }
  }

// navbar
<view class="navbar" style="height: {{navHeight}}px;">
  <view class="nav" style="top: {{navTop}}px;"> 
    <image src="../../assets/imgs/icon.png"></image>
    <view class="ipt">
      <input type="text" 	placeholder="搜索商品" style="background: url(../../assets/imgs/sousuo_o.png) no-repeat 12rpx center;background-size: 40rpx 40rpx;"/> 
    </view> 
  </view>
</view>

// app.js 获取导航栏高度
onLaunch() {
    let menuButtonObject = wx.getMenuButtonBoundingClientRect();
    wx.getSystemInfo({
      success: res => {
        let statusBarHeight = res.statusBarHeight,
          navTop = menuButtonObject.top,//胶囊按钮与顶部的距离
          navHeight = statusBarHeight + menuButtonObject.height + (menuButtonObject.top - statusBarHeight)*2;//导航高度
        this.globalData.navHeight = navHeight;
        this.globalData.navTop = navTop;
      },
      fail(err) {
        console.log(err);
      }
    })
  },

.navbar {
  width: 100%;
  /* height: 84rpx; */
  overflow: hidden;
  position: fixed;
  background-color: #FF5700;
  top: 0;
  left: 0;
  z-index: 10;
  flex-shrink: 0;
  color: #fff;
}
.nav{
  z-index: 99999;
  width: 100%;
  position: absolute;
  left: 0;
  display: flex;
  justify-content: flex-start;
  align-items: center;
}
...