【笔记】flutter 日历年月日自定义国际化显示

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

class CustomDatePicker extends StatefulWidget {
  @override
  _CustomDatePickerState createState() => _CustomDatePickerState();
}

class _CustomDatePickerState extends State<CustomDatePicker> {
  DateTime _selectedDate = DateTime.now();

  void _selectDate(BuildContext context) async {
    final DateTime picked = await showDatePicker(
      context: context,
      initialDate: _selectedDate,
      firstDate: DateTime(2020),
      lastDate: DateTime(2030),
      builder: (BuildContext context, Widget child) {
        return Theme(
          data: ThemeData.light(),
          child: child,
        );
      },
    );
    if (picked != null && picked != _selectedDate) {
      setState(() {
        _selectedDate = picked;
      });
    }
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: Center(
        child: Text(
          '${DateFormat('yyyy-MM-dd').format(_selectedDate)}',
          style: TextStyle(fontSize: 24),
        ),
      ),
      floatingActionButton: FloatingActionButton(
        onPressed: () => _selectDate(context),
        child: Icon(Icons.calendar_today),
      ),
    );
  }
}