cupertino_error_demo.dart

import 'package:flutter/material.dart';
import 'package:flutter/cupertino.dart';

final Color darkBlue = Color.fromARGB(255, 18, 32, 47);

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

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      theme: ThemeData.dark().copyWith(scaffoldBackgroundColor: darkBlue),
      debugShowCheckedModeBanner: false,
      home: Scaffold(
        body: Center(
          child: MyWidget(),
        ),
      ),
    );
  }
}

class MyWidget extends StatelessWidget {
  final bool condition = false;
  @override
  Widget build(BuildContext context) {
    return CustomScrollView(
      slivers: [
        CupertinoSliverNavigationBar(
          middle: Text("I Owe")
        ),
        SliverPadding(
          padding: const EdgeInsets.all(15.0),
          sliver: SliverList(
            delegate: SliverChildBuilderDelegate(
              (BuildContext context, int index) {
                return Padding(
                    padding: EdgeInsets.all(15),
                    child: Container(height: 100, color: Colors.white));
              },
              childCount: 50,
            ),
          ),
        )
      ],
    );
  }
}