1. 创建custom-tab-bar组件

各个文件代码如下
/custom-tab-bar/data.js

export default [{
    text: '流水笺',
    iconPath: '/assets/icon/bill.png',
    selectedIconPath: '/assets/icon/bill_actived.png',
    url: '/pages/notes/index',
  },
  {
    text: '星辰图',
    iconPath: '/assets/icon/charts.png',
    selectedIconPath: '/assets/icon/charts_actived.png',
    url: '/pages/star-chart/index',
  },
  {
    text: '时光账',
    iconPath: '/assets/icon/detail.png',
    selectedIconPath: '/assets/icon/detail_actived.png',
    url: '/pages/chronicle-ledger/index',
  },
  {
    text: '心灵岛',
    iconPath: '/assets/icon/mine.png',
    selectedIconPath: '/assets/icon/mine_actived.png',
    url: '/pages/soul-island/index',

  },
];

/custom-tab-bar/index.js

import TabMenu from './data';
console.log('TabMenu', TabMenu)
Component({
  data: {
    selected: 0,
    list: TabMenu,
  },

  methods: {
    onChange(event) {
      const url = event.detail.value
      this.setData({
        selected: url
      });
      wx.switchTab({
        url
      })
    },

    init() {
      const page = getCurrentPages().pop();
      const route = page ? page.route.split('?')[0] : '';
      const selected = this.data.list.findIndex(
        (item) =>
        (item.url.startsWith('/') ? item.url.substr(1) : item.url) ===
        `${route}`,
      );
      this.setData({
        selected
      });
    },
  },
});

/custom-tab-bar/index.json

{
  "component": true,
  "usingComponents": {
    "t-tab-bar": "tdesign-miniprogram/tab-bar/tab-bar",
    "t-tab-bar-item": "tdesign-miniprogram/tab-bar-item/tab-bar-item",
    "t-icon": "tdesign-miniprogram/icon/icon"
  }
}

/custom-tab-bar/index.wxml

<t-tab-bar class="custom-tab-bar tab-bar" value="{{selected}}" bindchange="onChange" split="{{false}}">
  <t-tab-bar-item wx:for="{{list}}" wx:for-item="item" wx:for-index="index" wx:key="index">
    <view class="custom-tab-bar-wrapper">
      <image class="icon" src="{{selected == index ?item.selectedIconPath: item.iconPath}}" alt="" />
      <view class="text">{{ item.text }}</view>
    </view>
  </t-tab-bar-item>
</t-tab-bar>

/custom-tab-bar/index.wxss

.custom-tab-bar-wrapper {
  display: flex;
  flex-direction: column;
  align-items: center;
}

.custom-tab-bar-wrapper .text {
  font-size: 20rpx;
}


.icon {
  width: 25px;
  height: 25px;
}

.tab-bar {
  --td-tab-bar-active-color: #9c6af1; // 修改选中icon的文案颜色
}

2. 修改app.json

app.json增加如下代码

  "tabBar": {
    "custom": true,
    "color": "#666666",
    "selectedColor": "#FF5F15",
    "backgroundColor": "#ffffff",
    "borderStyle": "black",
    "list": [{
        "pagePath": "pages/notes/index",
        "text": "流水笺"
      },
      {
        "pagePath": "pages/chronicle-ledger/index",
        "text": "星辰图"
      },
      {
        "pagePath": "pages/soul-island/index",
        "text": "时光账"
      },
      {
        "pagePath": "pages/star-chart/index",
        "text": "心灵岛"
      }
    ]
  },

3. tabbar对应页面调整

****.js
对应文件的onShow添加代码

 onShow() {
    if (typeof this.getTabBar === 'function' &&
      this.getTabBar()) {
      this.getTabBar().setData({
        selected: 2 // 控制哪一项是选中状态
      })
    }
  },

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如此即可正常使用自定义tabbar