Widget _disabledState(BuildContext context) {
    return TDTextarea(
      controller: controller[4],
      label: '标签文字',
      hintText: '不可编辑文字',
      maxLines: 4,
      minLines: 4,
      readOnly: true,
      onChanged: (value) {
        setState(() {});
      },
    );
  }