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

void main() => runApp(const MyApp());

class MyApp extends StatelessWidget {
  const MyApp({Key? key}) : super(key: key);

  @override
  Widget build(BuildContext context) {
    Duration duration = const Duration(hours: 1, minutes: 23);

    return MaterialApp(
      title: 'CupertinoTimerPicker (MaterialApp)',
      theme: ThemeData(brightness: Brightness.dark),
      home: Scaffold(
        body: Center(
          child: SizedBox(
            height: 250,
            child: CupertinoTimerPicker(
              mode: CupertinoTimerPickerMode.hm,
              initialTimerDuration: duration,
              onTimerDurationChanged: (Duration newDuration) {},
            ),
          ),
        ),
      ),
    );
  }
}