flutter - 带有 SliverAppBar 的 NestedScrollView 导致意外的 body 填充

Question

当我运行这段代码时，ListView 将有意外的顶部填充。 (见截图)为什么会这样，有没有办法避免这种情况？

我已经尝试过 SliverOverlapAbsorber、SafeArea 和 MediaQuery 来修复填充，但到目前为止似乎没有任何效果。

import 'package:flutter/material.dart';

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

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

class MyHomePage extends StatelessWidget {
  MyHomePage({Key? key}) : super(key: key);

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: NestedScrollView(
        headerSliverBuilder: (context, innerBoxIsScrolled) => [
          SliverAppBar(
            pinned: true,
            title: Text('Title'),
          ),
        ],
        body: ListView.builder(
          itemCount: 24,
          itemBuilder: (context, index) => Container(
            height: 40,
            alignment: Alignment.center,
            color: Colors.yellow,
            margin: EdgeInsets.only(top: index != 0 ? 8 : 0),
            child: Text('Body $index'),
          ),
        ),
      ),
    );
  }
}

Doctor summary (to see all details, run flutter doctor -v):
[✓] Flutter (Channel stable, 2.2.3, on macOS 11.5.1 20G80 darwin-x64, locale de-DE)
[!] Android toolchain - develop for Android devices (Android SDK version 30.0.2)
    ✗ Android license status unknown.
      Run `flutter doctor --android-licenses` to accept the SDK licenses.
      See https://flutter.dev/docs/get-started/install/macos#android-setup for more details.
[✓] Xcode - develop for iOS and macOS
[✓] Chrome - develop for the web
[✓] Android Studio (version 4.2)
[✓] IntelliJ IDEA Community Edition (version 2021.1.1)
[✓] VS Code (version 1.59.0)
[✓] Connected device (2 available)

Answer 1

似乎没有办法避免手动删除填充。所以我的解决方案现在看起来像这样:

return Scaffold(
      body: DefaultTabController(
        length: 2,
        child: NestedScrollView(
          headerSliverBuilder: (context, innerBoxIsScrolled) => [
            SliverAppBar(
              pinned: true,
              title: Text('Title'),
              bottom: TabBar(tabs: [Tab(text: 'T 1'), Tab(text: 'T 2')]),
            ),
          ],
          body: MediaQuery.removePadding(
            removeTop: true,
            context: context,
            child: ListView.builder(
              itemCount: 24,
              itemBuilder: (context, index) => Container(
                height: 40,
                padding: EdgeInsets.zero,
                alignment: Alignment.center,
                color: Colors.yellow,
                margin: EdgeInsets.only(top: index != 0 ? 8 : 0),
                child: Text('Body $index'),
              ),
            ),
          ),
        ),
      ),
    );