07_Flutter使用NestedScrollView+TabBarView滚动位置共享问题修复

import 'package:flutter/material.dart';
 
class NestedScrollViewWithTabBarExample extends StatefulWidget {
  @override
  _NestedScrollViewWithTabBarExampleState createState() => _NestedScrollViewWithTabBarExampleState();
}
 
class _NestedScrollViewWithTabBarExampleState extends State<NestedScrollViewWithTabBarExample> with SingleTickerProviderStateMixin {
  final List<Tab> myTabs = <Tab>[
    Tab(text: 'TAB1'),
    Tab(text: 'TAB2'),
  ];
 
  TabController _tabController;
 
  @override
  void initState() {
    super.initState();
    _tabController = TabController(vsync: this, length: myTabs.length);
  }
 
  @override
  void dispose() {
    _tabController.dispose();
    super.dispose();
  }
 
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: NestedScrollView(
        headerSliverBuilder: (BuildContext context, bool innerBoxIsScrolled) {
          return <Widget>[
            SliverAppBar(
              title: Text('NestedScrollView with TabBar'),
              floating: true,
              snap: true,
              pinned: true,
              bottom: TabBar(
                controller: _tabController,
                tabs: myTabs,
              ),
            ),
          ];
        },
        body: TabBarView(
          controller: _tabController,
          children: myTabs.map((Tab tab) {
            return SafeArea(
              top: false,
              child: Builder(
                builder: (BuildContext context) {
                  return CustomScrollView(
                    slivers: <Widget>[
                      SliverPadding(
                        padding: const EdgeInsets.all(15.0),
                        sliver: SliverList(
                          delegate: SliverChildListDelegate([
                            Text(tab.text),
                            // ...更多内容
                          ]),
                        ),
                      ),
                    ],
                  );
                },
              ),
            );
          }).toList(),
        ),
      ),
    );
  }
}

这段代码修复了原始代码中的滚动位置共享问题，通过使用TabController来控制TabBarView的滚动，确保每个Tab的滚动位置是独立的。同时，使用CustomScrollView代替了ListView，以便可以嵌套在NestedScrollView中。