gistfile1.txt

import 'package:flutter/cupertino.dart';

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

class App extends StatefulWidget {
  @override
  State<StatefulWidget> createState() {
    return _AppState();
  }
}

class _AppState extends State<App> {
  @override
  Widget build(BuildContext context) {
    return CupertinoTabScaffold(
        tabBar: CupertinoTabBar(items: [
          BottomNavigationBarItem(
              icon: Icon(CupertinoIcons.home), title: Text("Home")),
          BottomNavigationBarItem(
              icon: Icon(CupertinoIcons.home), title: Text("Explore")),
        ]),
        tabBuilder: (context, index) {
          switch (index) {
            case 0:
              return HomeScreen();
              break;
            case 1:
              return HomeScreen();
              break;
            default:
              return HomeScreen();
              break;
          }
        },
    );
  }
}

class HomeScreen extends StatefulWidget {
  @override
  createState() => _HomeScreen();
}

class _HomeScreen extends State<HomeScreen> {
  Widget get _scrollView {
    return LayoutBuilder(
      builder: (BuildContext context, BoxConstraints viewportConstraints) {
        return SingleChildScrollView(
          physics: AlwaysScrollableScrollPhysics(),
          child: ConstrainedBox(
            constraints: BoxConstraints(
              minHeight: viewportConstraints.maxHeight,
            ),
            child: SafeArea(
              child: Column(children: [
                Text("foo"),
                GridView.count(
                  scrollDirection: Axis.horizontal,
                  physics: AlwaysScrollableScrollPhysics(),
                  shrinkWrap: true,
                  crossAxisCount: 2,
                  //padding: EdgeInsets.all(4.0),
                  childAspectRatio: 8.0 / 9.0,
                  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: _scrollView);
  }
}