Flutter Datepicker - 在选择日期关闭，而不是按 OK 确认按钮？

Question

Is it possible for a flutter datepicker to close as soon as a date is pressed? something like a jquery datepicker ...

  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;
        selectedDateF = "${selectedDate.toLocal()}".split(' ')[0];
      });
  }

Answer 1

You can use the CalendarDatePicker widget. Here's a complete example:

import 'package:flutter/material.dart';

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

class MyApp extends StatelessWidget {
  const MyApp({Key? key}) : super(key: key);

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Custom Date Picker',
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
      home: const MyHomePage(),
    );
  }
}

class MyHomePage extends StatefulWidget {
  const MyHomePage({Key? key}) : super(key: key);

  @override
  _MyHomePageState createState() {
    return _MyHomePageState();
  }
}

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

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: const Text('Custom Date Picker'),
      ),
      body: Center(
        child: Column(
          mainAxisAlignment: MainAxisAlignment.spaceEvenly,
          children: [
            Text(
              _selectedDate.toString().split(' ').first,
              style: Theme.of(context).textTheme.headline4,
            ),
            ElevatedButton(
              onPressed: () async {
                final result = (await Navigator.push(
                  context,
                  MaterialPageRoute<DateTime>(builder: (context) => DatePicker(initialDate: _selectedDate)),
                ))!;
                setState(() {
                  _selectedDate = result;
                });
              },
              child: const Text("Pick Date"),
            ),
          ],
        ),
      ),
    );
  }
}

class DatePicker extends StatelessWidget {
  final DateTime initialDate;

  const DatePicker({required this.initialDate, Key? key}) : super(key: key);

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: const Text("Pick Date"),
        leading: IconButton(
          icon: const Icon(Icons.arrow_back),
          onPressed: () => Navigator.pop<DateTime>(context, initialDate),
        ),
      ),
      body: Center(
        child: Container(
          color: Colors.blue[50],
          margin: const EdgeInsets.all(10.0),
          padding: const EdgeInsets.all(10.0),
          child: CalendarDatePicker(
            initialDate: initialDate,
            firstDate: DateTime(2021),
            lastDate: DateTime(2025),
            onDateChanged: (DateTime selectedDate) {
              Navigator.pop<DateTime>(context, selectedDate);
            },
          ),
        ),
      ),
    );
  }
}