main.dart

import 'package:flutter/cupertino.dart';

main() => runApp(new CupertinoApp(
    home: HomeScreen()
  )
);

class HomeScreen extends StatelessWidget {
  Widget get _list {
    return GridView.count(
        scrollDirection: Axis.horizontal,
        physics: AlwaysScrollableScrollPhysics(),
        shrinkWrap: true,
        crossAxisCount: 2,
        children: List<String>.generate(100, (i) => "Item $i")
            .map((item) => Column(children: [
          Container(
              width: 100,
              height: 100,
              color: CupertinoColors.destructiveRed),
          Text(item),
        ]))
            .toList(),
      );

  }

  @override
  Widget build(BuildContext context) {
    return CupertinoPageScaffold(
        //navigationBar: CupertinoNavigationBar(middle: Text("Welcome")),
        child: _list);
  }
}

import 'package:flutter/cupertino.dart';

main() => runApp(new CupertinoApp(home: HomeScreen()));

class HomeScreen extends StatelessWidget {
  Widget get _list {
    return SingleChildScrollView(
      scrollDirection: Axis.horizontal,
      physics: AlwaysScrollableScrollPhysics(),
      child: Row(
        children: List<Map<int, String>>.generate(
                50,
                (int _i) => <int, String>{
                      1: "Item ${_i * 2}",
                      2: "Item ${_i * 2 + 1}",
                    })
            .map<Widget>(
              (Map<int, String> _map) => Column(
                children: [
                  Container(
                      width: 100,
                      height: 100,
                      color: CupertinoColors.destructiveRed),
                  Text(_map[1]),
                  Container(
                      width: 100,
                      height: 100,
                      color: CupertinoColors.destructiveRed),
                  Text(_map[2]),
                ],
              ),
            )
            .toList(),
      ),
    );
  }

  @override
  Widget build(BuildContext context) {
    return CupertinoPageScaffold(
        backgroundColor: Color(0xFF0000FF),
        child: _list);
  }
}