Widget _basicTypeOptional(BuildContext context) {
    return Column(
      children: [
        TDInput(
          leftLabel: '标签文字',
          controller: controller[2],
          backgroundColor: Colors.white,
          hintText: '请输入文字(选填)',
          onChanged: (text) {
            setState(() {});
          },
          onClearTap: () {
            controller[2].clear();
            setState(() {});
          },
        ),
        const SizedBox(
          height: 16,
        )
      ],
    );
  }