小编Yun*_*lik的帖子

当我选择下拉按钮的值时，我想删除这个灰色按钮。我该怎么做。我尝试了一切 这是我的代码

InputDecorator(
      decoration: const InputDecoration(
        border: OutlineInputBorder(borderRadius: BorderRadius.all(Radius.circular(4.0))),
        contentPadding: EdgeInsets.all(10),
      ),
      child: DropdownButtonHideUnderline(
        child: DropdownButton<dynamic>(
          value: null,
          isDense: true,
          hint: Text(hintText),
          isExpanded: true,
          items: itemList,
          onChanged: (newValue) {},
        ),
      ),
    ),