Flutter :如何在Flutter中使用这种UI来选择日期

import 'package:flutter/material.dart';

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

class _MyDatePickerState extends State<MyDatePicker> {
  DateTime selectedDate = DateTime.now();

  Future<void> _selectDate(BuildContext context) async {
    final DateTime? picked = await showDatePicker(
      context: context,
      initialDate: selectedDate,
      firstDate: DateTime(2000),
      lastDate: DateTime(2100),
    );
    if (picked != null && picked != selectedDate)
      setState(() {
        selectedDate = picked;
      });
  }

  @override
  Widget build(BuildContext context) {
    return Column(
      children: <Widget>[
        ElevatedButton(
          onPressed: () => _selectDate(context),
          child: Text('选择日期'),
        ),
        Text('选择的日期：${selectedDate.toString()}'),
      ],
    );
  }
}

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