wx-parent/custom-tab-bar/index.wxml

<view class="tab-bar">
  <block wx:for="{{list}}" wx:key="index">
    <view class="tab-item {{selected === index ? 'active' : ''}}" bindtap="onTabTap" data-index="{{index}}">
      <image class="tab-icon" src="{{selected === index ? item.selectedIconPath : item.iconPath}}" />
      <text class="tab-text">{{item.text}}</text>
    </view>
  </block>
</view>