Flutter获取周数插件week_number的使用

week_number 是一个用于获取 Dart DateTime 对象周数的快速、无依赖扩展方法包。它支持以下两种系统：

• ISO 8601
• Western Traditional

此外，该包还包含从年份和周数或序数日期创建 DateTime 的函数。

支持的系统

ISO 8601

示例代码

import 'package:week_number/iso.dart';

void main() {
  final date = DateTime.now();
  print(date.weekNumber); // 获取 ISO 周数
  print(date.ordinalDate); // 获取序数日期
  print(date.isLeapYear); // 是否是闰年

  final DateTime dateFromWeekNumber = dateTimeFromWeekNumber(2023, 2);
  print(dateFromWeekNumber); // 2023-01-09
  print(dateTimeFromOrdinalDate(2023, 365)); // 2023-12-31
  print(dateTimeFromOrdinalDate(2024, 366)); // 2024-12-31
}

Western Traditional

示例代码

import 'package:week_number/western_traditional.dart';

void main() {
  final date = DateTime.now();
  print(date.weekNumber); // 获取 Western Traditional 周数
  print(date.ordinalDate); // 获取序数日期
  print(date.isLeapYear); // 是否是闰年
  print(date.weekdayFromSunday); // 星期日 = 1, 星期一 = 2, ...

  final DateTime dateFromWeekNumber = dateTimeFromWeekNumber(2023, 2);
  print(dateFromWeekNumber); // 2023-01-08
  print(dateTimeFromOrdinalDate(2023, 365)); // 2023-12-31
  print(dateTimeFromOrdinalDate(2024, 366)); // 2024-12-31
}

使用该包的产品

• DidRoku : A Life logging app

完整示例 Demo

以下是一个完整的 Flutter 应用示例，展示了如何使用 week_number 插件来获取当前日期的周数和其他相关信息。

pubspec.yaml

首先，在 pubspec.yaml 文件中添加 week_number 依赖：

dependencies:
  flutter:
    sdk: flutter
  week_number: ^1.0.0

main.dart

然后，在 main.dart 文件中编写示例代码：

import 'package:flutter/material.dart';
import 'package:week_number/iso.dart';
import 'package:week_number/western_traditional.dart';

void main() {
  runApp(MyApp());
}

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Week Number Demo',
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
      home: WeekNumberPage(),
    );
  }
}

class WeekNumberPage extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    final date = DateTime.now();

    return Scaffold(
      appBar: AppBar(
        title: Text('Week Number Demo'),
      ),
      body: Padding(
        padding: const EdgeInsets.all(16.0),
        child: Column(
          crossAxisAlignment: CrossAxisAlignment.start,
          children: [
            Text('Current Date: ${date.toString()}'),
            SizedBox(height: 10),
            Text('ISO 8601 Week Number: ${date.weekNumber}'),
            Text('ISO 8601 Ordinal Date: ${date.ordinalDate}'),
            Text('ISO 8601 Is Leap Year: ${date.isLeapYear}'),
            SizedBox(height: 10),
            Text('Western Traditional Week Number: ${date.weekNumber}'),
            Text('Western Traditional Ordinal Date: ${date.ordinalDate}'),
            Text('Western Traditional Is Leap Year: ${date.isLeapYear}'),
            Text('Western Traditional Weekday from Sunday: ${date.weekdayFromSunday}'),
            SizedBox(height: 10),
            Text('Date from Week Number (2023, 2): ${dateTimeFromWeekNumber(2023, 2)}'),
            Text('Date from Ordinal Date (2023, 365): ${dateTimeFromOrdinalDate(2023, 365)}'),
            Text('Date from Ordinal Date (2024, 366): ${dateTimeFromOrdinalDate(2024, 366)}'),
          ],
        ),
      ),
    );
  }
}

运行应用

运行上述 Flutter 应用，你将看到当前日期的 ISO 8601 和 Western Traditional 周数、序数日期、是否为闰年等信息。

希望这个示例对你有所帮助！如果有任何问题或需要进一步的帮助，请随时提问。