Widget _showBottomLine(BuildContext context) {
    return TDRadioGroup(
      selectId: 'index:1',
      direction: Axis.horizontal,
      showDivider: true,
      directionalTdRadios: const [
        TDRadio(
          id: '0',
          title: '单选标题',
          radioStyle: TDRadioStyle.circle,
          showDivider: false,
        ),
        TDRadio(
          id: '1',
          title: '单选标题',
          radioStyle: TDRadioStyle.circle,
          showDivider: false,
        ),
        TDRadio(
          id: '2',
          title: '上限四字',
          radioStyle: TDRadioStyle.circle,
          showDivider: false,
        ),
      ],
    );
  }