upstream-flutter-samples/cupertino_gallery/lib/widgets/action_sheet_page.dart

import 'package:flutter/cupertino.dart';

class ActionSheetPage extends StatelessWidget {
  const ActionSheetPage({super.key});

  @override
  Widget build(BuildContext context) {
    return CupertinoPageScaffold(
      navigationBar: const CupertinoNavigationBar(middle: Text('Action Sheet')),
      child: Center(
        child: CupertinoButton(
          child: const Text('Show Action Sheet'),
          onPressed: () {
            showCupertinoModalPopup<void>(
              context: context,
              builder: (context) => CupertinoActionSheet(
                title: const Text('Title'),
                message: const Text('Message'),
                actions: <CupertinoActionSheetAction>[
                  CupertinoActionSheetAction(
                    child: const Text('Action One'),
                    onPressed: () {
                      Navigator.pop(context);
                    },
                  ),
                  CupertinoActionSheetAction(
                    child: const Text('Action Two'),
                    onPressed: () {
                      Navigator.pop(context);
                    },
                  ),
                ],
                cancelButton: CupertinoActionSheetAction(
                  isDefaultAction: true,
                  onPressed: () {
                    Navigator.pop(context);
                  },
                  child: const Text('Cancel'),
                ),
              ),
            );
          },
        ),
      ),
    );
  }
}