在颤振应用程序中添加日期选择器的正确方法是什么？

Question

在我的应用程序中，我正在创建需要添加 DOB 的注册页面。我想在其中添加日期选择器，但我没有得到正确的方法来做到这一点。

原文由 Code Hunter 发布，翻译遵循 CC BY-SA 4.0 许可协议

Answer 1

一个展示其用途的简单应用程序：

 import 'dart:async';

import 'package:flutter/material.dart';

void main() => runApp(MyApp());

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      home: MyHomePage(title: 'Flutter Demo Home Page'),
    );
  }
}

class MyHomePage extends StatefulWidget {
  MyHomePage({Key key, this.title}) : super(key: key);

  final String title;

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

class _MyHomePageState extends State<MyHomePage> {
  DateTime selectedDate = DateTime.now();

  Future<void> _selectDate(BuildContext context) async {
    final DateTime? picked = await showDatePicker(
        context: context,
        initialDate: selectedDate,
        firstDate: DateTime(2015, 8),
        lastDate: DateTime(2101));
    if (picked != null && picked != selectedDate) {
      setState(() {
        selectedDate = picked;
      });
    }
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text(widget.title),
      ),
      body: Center(
        child: Column(
          mainAxisSize: MainAxisSize.min,
          children: <Widget>[
            Text("${selectedDate.toLocal()}".split(' ')[0]),
            SizedBox(height: 20.0,),
            RaisedButton(
              onPressed: () => _selectDate(context),
              child: Text('Select date'),
            ),
          ],
        ),
      ),
    );
  }
}

还有一个飞镖盘：

https://dartpad.dev/e5a99a851ae747e517b75ac221b73529

原文由 chemamolins 发布，翻译遵循 CC BY-SA 4.0 许可协议

Answer 2

    DateTime _chosenDateTime;

   // Show the modal that contains the CupertinoDatePicker
    void _showDatePicker(context) {
    // showCupertinoModalPopup is a built-in function of the cupertino library
   showCupertinoModalPopup(
   context: context,
   builder: (_) => Container(
  height: 500,
  color: Color.fromARGB(255, 255, 255, 255),
  child: Column(
    children: [
      Container(
        height: 400,
        child: CupertinoDatePicker(
            initialDateTime: DateTime.now(),
            onDateTimeChanged: (val) {
              setState(() {
                _chosenDateTime = val;
              });
            }),
        ),
       ],
     ),
  ));

原文由 user15374793 发布，翻译遵循 CC BY-SA 4.0 许可协议