如何在颤振的NestedScrollView中设置SliverAppBar的最小高度

import 'package:flutter/material.dart';

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

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        body: NestedScrollView(
          headerSliverBuilder: (BuildContext context, bool innerBoxIsScrolled) {
            return <Widget>[
              SliverAppBar(
                title: Text('NestedScrollView with SliverAppBar'),
                expandedHeight: 200.0,
                minHeight: 50.0, // 设置最小高度
                flexibleSpace: FlexibleSpaceBar(
                  background: Image.asset(
                    'assets/image.jpg',
                    fit: BoxFit.cover,
                  ),
                ),
              ),
            ];
          },
          body: Center(
            child: Text('Scroll down to see the SliverAppBar collapse'),
          ),
        ),
      ),
    );
  }
}