如何将最大日期设置为flutter中的cupertino？

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

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

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        appBar: AppBar(
          title: Text('Cupertino DatePicker'),
        ),
        body: Center(
          child: MyDatePicker(),
        ),
      ),
    );
  }
}

class MyDatePicker extends StatefulWidget {
  @override
  _MyDatePickerState createState() => _MyDatePickerState();
}

class _MyDatePickerState extends State<MyDatePicker> {
  DateTime selectedDate = DateTime.now();
  DateTime maxDate = DateTime.now().add(Duration(days: 365)); // 设置最大日期为当前日期后的一年

  Future<void> _selectDate(BuildContext context) async {
    final DateTime? picked = await showDatePicker(
      context: context,
      initialDate: selectedDate,
      firstDate: DateTime(1900),
      lastDate: maxDate,
    );
    if (picked != null && picked != selectedDate)
      setState(() {
        selectedDate = picked;
      });
  }

  @override
  Widget build(BuildContext context) {
    return Column(
      mainAxisAlignment: MainAxisAlignment.center,
      children: <Widget>[
        Text(
          'Selected Date: ${selectedDate.toString().split(' ')[0]}',
          style: TextStyle(fontSize: 20),
        ),
        SizedBox(height: 20),
        CupertinoButton(
          child: Text('Select Date'),
          onPressed: () => _selectDate(context),
        ),
      ],
    );
  }
}