Flutter开发之——日期选择器

import 'package:flutter/material.dart';
 
class DatePickerPage extends StatefulWidget {
  @override
  _DatePickerPageState createState() => _DatePickerPageState();
}
 
class _DatePickerPageState extends State<DatePickerPage> {
  DateTime _selectedDate = DateTime.now();
 
  void _selectDate(BuildContext context) async {
    final DateTime picked = await showDatePicker(
      context: context,
      initialDate: _selectedDate,
      firstDate: DateTime(2020),
      lastDate: DateTime(2025),
    );
    if (picked != null && picked != _selectedDate) {
      setState(() {
        _selectedDate = picked;
      });
    }
  }
 
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('Date Picker Example'),
      ),
      body: Center(
        child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: <Widget>[
            Text('${_selectedDate.toLocal()}'),
            RaisedButton(
              child: Text('Select Date'),
              onPressed: () => _selectDate(context),
            ),
          ],
        ),
      ),
    );
  }
}

这段代码实现了一个简单的日期选择器，用户可以通过点击按钮打开日期选择器，选择日期后更新界面上显示的日期信息。这个例子展示了如何在Flutter应用中使用showDatePicker函数来实现日期选择的功能。