Question

我正在尝试在自定义滚动视图中实现两个Sliver小部件，并且一旦向下滚动并返回列表中的项目，我将面临sliverbuilderlist中传递的数据状态问题处理，因此我得到一个错误。仅当我同时使用两个或多个条子小部件时，才发生这种情况，条子列表本身就可以了，现在，我正在实现带有两个标签的可折叠sliverappbar 我通过了sliverlistbuilder两个选项卡，几秒钟后再次上下滚动时出现错误，请帮助我了解问题

关于此问题，我什么都找不到，我尝试将包含int sliverlist的Widget更改为有状态的Widget，并尝试在sliver参数之前调用set state，但这没有用

feed [i]从提供者Feed中绘制对象

class FeedItemScreen extends StatefulWidget {


 @override

_ FeedItemScreenState createState() => _FeedItemScreenState();}

class _FeedItemScreenState extends State<FeedItemScreen> {




 @override Widget build(BuildContext context) {
final feedData = Provider.of<Feed>(context);
final feed = feedData.items;

setState(() {});
return CustomScrollView(
  slivers: <Widget>[
    SliverList(
      delegate: SliverChildBuilderDelegate(
        (context, i) => ChangeNotifierProvider(
          builder: (ctx) => feed[i],
          child: FeedsItem(),
        ),
        childCount: feed.length,
      ),
    ),
  ],
);

} }

inside Defaulttabcontroller : I'm passing FeedScreen(), which builds the list to one of the tabs 



 body: TabBarView(
          children: <Widget>[
            NotificationScreen(),
            FeedScreen(),
          ],
        )),

/flutter ( 5092): ══╡ EXCEPTION CAUGHT BY WIDGETS LIBRARY ╞═══════════════════════════════════════════════════════════
I/flutter ( 5092): The following assertion was thrown building NotificationListener<KeepAliveNotification>:
I/flutter ( 5092): A FeedItem was used after being disposed.
I/flutter ( 5092): Once you have called dispose() on a FeedItem, it can no longer be used.

FeedItem是我的数据传递到的类，这是我得到的错误，当在单个视口中使用多个条子时，我也遇到了相同的错误。

使用多个条时的状态问题

0 个答案: