如何从DropdownButtonFormField中重置或选择第一个值?从这里How to reset value in Flutter DropdownButtonFormField的答案是过时的,不适合较新的颤动版本。DropdownButtonFormField: final etSkillScore1Key = GlobalKey<FormState>(); key: et
我尝试在颤振中设置下拉按钮的值。实际上,它从列表中获取项值。当我在Dropdownbutton按钮中添加value: _cStatus,时,收到以下错误消息:
应该正好有一个具有DropdownButton值的项:。检测到零或更多个DropdownMenuItems,其值为‘package:flutter/src/ Either /dropdown.dart. were