记录一下flutter的小细节，setState() setState 只能更新当前widget的状态，当前widget下面还有别的widget情况下，是不会生效子widgetList<String> items = List.generate(10, (index) => "item$index"); class ChatList extends StatelessWidget { @override Widget build(BuildContext context) { return Column( children: [ Expanded( child: ListView.builder( itemCount: items.length, itemBuilder: (context, index) { return ChatItem(chat: items[index]); }, ) )]); } } class HomePage extends StatelessWidget { const HomePage({super.key}); @override Widget build(BuildContext context) { return ChatList(); } void changeChatList(){ setState(){ items.add("new data") } } }这样在Hone Page调用chagngeChatList方法，ChatList中的视图没有变化，可以将items移动到HomePage，并将值通过构造传入，这种做法可以给变量提权修改后 class ChatList extends StatelessWidget { final List<String> items; const ChatList({this.items}) @override Widget build(BuildContext context) { return Column( children: [ Expanded( child: ListView.builder( itemCount: items.length, itemBuilder: (context, index) { return ChatItem(chat: items[index]); }, ) )]); } } class HomePage extends StatelessWidget { List<String> items = List.generate(10, (index) => "item$index"); const HomePage({super.key}); @override Widget build(BuildContext context) { return ChatList(items); } void changeChatList(){ setState(){ items.add("new data") } } }