Flutter 解决NestedScrollView与TabBar双列表滚动位置同步问题

文章目录

前言
一、需要实现的效果如下
二、flutter实现代码如下：
总结

前言

最近写flutter项目，遇到NestedScrollView与TabBar双列表滚动位置同步问题，下面是解决方案，希望帮助到大家。

一、需要实现的效果如下

1、UI图：
请添加图片描述
需要实现的效果是，左边滑动的时候，右边的列表不要随左边滑动。右边滑动的时候，左边也不要滑动。

二、flutter实现代码如下：

1、用flutter原生的NestedScrollView是有问题的
2、使用第三方库解决这个问题extended_nested_scroll_view: ^6.2.1
3、完整的代码如下：

import 'package:extended_nested_scroll_view/extended_nested_scroll_view.dart';
import 'package:flutter/material.dart';void main() {runApp(const MyBitApp());
}class MyBitApp extends StatelessWidget {const MyBitApp({super.key});// This widget is the root of your application.@overrideWidget build(BuildContext context) {return MaterialApp(title: 'Flutter Demo',theme: ThemeData(colorScheme: ColorScheme.fromSeed(seedColor: Colors.deepPurple),useMaterial3: true,),home: MyApp(),);}
}class MyApp extends StatelessWidget {@overrideWidget build(BuildContext context) {return MaterialApp(title: 'NestedScrollView Demo',theme: ThemeData(primarySwatch: Colors.blue,),home: MyHomePage(),);}
}class MyHomePage extends StatefulWidget {@override_MyHomePageState createState() => _MyHomePageState();
}class _MyHomePageState extends State<MyHomePage> with SingleTickerProviderStateMixin {late TabController _tabController;late List<ScrollController> _scrollControllers;late ScrollController nestedScrollController;@overridevoid initState() {super.initState();_tabController = TabController(length: 2, vsync: this);_scrollControllers = [ScrollController(),ScrollController(),];nestedScrollController = ScrollController();}@overridevoid dispose() {_tabController.dispose();for (var controller in _scrollControllers) {controller.dispose();}super.dispose();}@overrideWidget build(BuildContext context) {// var tabBarHeight = primaryTabBar.preferredSize.height;double statusBarHeight = MediaQuery.of(context).padding.top;var pinnedHeaderHeight = statusBarHeight + kToolbarHeight;return Scaffold(body: DefaultTabController(length: 2,child: ExtendedNestedScrollView(onlyOneScrollInBody: true,pinnedHeaderSliverHeightBuilder: () => pinnedHeaderHeight,headerSliverBuilder: (context, innerBoxIsScrolled) {return [SliverAppBar(title: Text('NestedScrollView Demo'),pinned: true,floating: true,expandedHeight: 200,stretch: true,elevation: 0,stretchTriggerOffset: 100,bottom: TabBar(controller: _tabController,tabs: [Tab(text: 'Tab 1'),Tab(text: 'Tab 2'),],),),];},body: TabBarView(controller: _tabController,children: [KeepAliveWrapper(child: MediaQuery.removePadding(removeTop: true,context: context,child: ListView.builder(itemCount: 1000,itemBuilder: (context, index) {return ListTile(title: Text('Tab 1 Item $index'),);},),),),KeepAliveWrapper(child: MediaQuery.removePadding(removeTop: true,context: context,child: ListView.builder(itemCount: 1000,itemBuilder: (context, index) {return ListTile(title: Text('Tab 2 Item $index'),);},),),),],),),),);}
}class KeepAliveWrapper extends StatefulWidget {final Widget child;const KeepAliveWrapper({Key? key, required this.child}) : super(key: key);@override_KeepAliveWrapperState createState() => _KeepAliveWrapperState();
}class _KeepAliveWrapperState extends State<KeepAliveWrapper> with AutomaticKeepAliveClientMixin {@overrideWidget build(BuildContext context) {super.build(context);return widget.child;}@overridebool get wantKeepAlive => true;
}