电子商务网站建设作业总结,软件开发过程中存在哪些问题,网络工程师可以从事什么工作,腾讯企业邮箱登录入口文章目录 前言一、需要实现的效果如下二、flutter实现代码如下#xff1a;总结 前言
最近写flutter项目#xff0c;遇到NestedScrollView与TabBar双列表滚动位置同步问题#xff0c;下面是解决方案#xff0c;希望帮助到大家。 一、需要实现的效果如下
1、UI图#xff1… 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 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 StateMyHomePage with SingleTickerProviderStateMixin {late TabController _tabController;late ListScrollController _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 StateKeepAliveWrapper with AutomaticKeepAliveClientMixin {overrideWidget build(BuildContext context) {super.build(context);return widget.child;}overridebool get wantKeepAlive true;
}总结
这就是Flutter解决NestedScrollView与TabBar双列表滚动位置同步问题相关代码希望能帮助到你
