小编vir*_*hjx的帖子

题：

使用可折叠的应用程序栏（sliverAppBar）时如何保留tabView的滚动位置？

码：

import 'package:flutter/material.dart';

void main() {
  runApp(new MyApp());
}

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return new MaterialApp(
      home: new MyHomePage(),
    );
  }
}

class MyHomePage extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return new DefaultTabController(
      length: 2,
      child: Scaffold(
        body: NestedScrollView(
          headerSliverBuilder: (BuildContext context, bool innerBoxIsScrolled) {
            return <Widget>[
              SliverAppBar(
                title: Text('Example'),
                pinned: true,
                floating: true,
                forceElevated: innerBoxIsScrolled,
                bottom: …