如何在flutter中自定义水平时间选择器？

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

class CustomTimePicker extends StatefulWidget {
  final DateTime initialTime;
  final ValueChanged<DateTime> onTimeChanged;

  CustomTimePicker({this.initialTime, this.onTimeChanged});

  @override
  _CustomTimePickerState createState() => _CustomTimePickerState();
}

class _CustomTimePickerState extends State<CustomTimePicker> {
  DateTime selectedTime;

  @override
  void initState() {
    super.initState();
    selectedTime = widget.initialTime ?? DateTime.now();
  }

  @override
  Widget build(BuildContext context) {
    return Row(
      mainAxisAlignment: MainAxisAlignment.center,
      children: <Widget>[
        IconButton(
          icon: Icon(Icons.arrow_left),
          onPressed: () {
            setState(() {
              selectedTime = selectedTime.subtract(Duration(hours: 1));
              widget.onTimeChanged(selectedTime);
            });
          },
        ),
        Text(
          selectedTime.hour.toString().padLeft(2, '0') +
              ":" +
              selectedTime.minute.toString().padLeft(2, '0'),
          style: TextStyle(fontSize: 20),
        ),
        IconButton(
          icon: Icon(Icons.arrow_right),
          onPressed: () {
            setState(() {
              selectedTime = selectedTime.add(Duration(hours: 1));
              widget.onTimeChanged(selectedTime);
            });
          },
        ),
      ],
    );
  }
}

// 使用示例
class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        appBar: AppBar(
          title: Text('Custom Time Picker'),
        ),
        body: Center(
          child: CustomTimePicker(
            initialTime: DateTime.now(),
            onTimeChanged: (time) {
              print(time);
              // 在这里可以处理选择的时间
            },
          ),
        ),
      ),
    );
  }
}

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