Widget _verticalCardStyle(BuildContext context) {
    return TDRadioGroup(
      selectId: 'index:1',
      cardMode: true,
      direction: Axis.vertical,
      directionalTdRadios: const [
        TDRadio(
          id: 'index:0',
          title: '单选',
          titleMaxLine: 2,
          subTitleMaxLine: 2,
          subTitle: '描述信息',
          cardMode: true,
        ),
        TDRadio(
          id: 'index:1',
          title: '单选',
          titleMaxLine: 2,
          subTitleMaxLine: 2,
          subTitle: '描述信息',
          cardMode: true,
        ),
        TDRadio(
          id: 'index:2',
          title: '单选',
          titleMaxLine: 2,
          subTitleMaxLine: 2,
          subTitle: '描述信息',
          cardMode: true,
        ),
        TDRadio(
          id: 'index:3',
          title: '单选',
          titleMaxLine: 2,
          subTitleMaxLine: 2,
          subTitle: '描述信息',
          cardMode: true,
        ),
      ],
    );
  }