Flutter日期选择插件date_only_field的使用

Flutter日期选择插件date_only_field的使用

这是一款在Flutter中仅用于选择日期的插件。它与DateTime逻辑相似，但不包含时间部分。

特性

轻松拆分仅日期字段并进行处理。

开始使用

添加依赖项

在pubspec.yaml文件中添加以下依赖项：

dependencies:
    date_only_field: ^0.0.13

导入包

根据需求导入相应的包：

/// 如果只需要导入日期字段，请使用此方法
import 'package:date_only_field/date_only_field.dart';

/// 如果需要导入带有持续时间扩展的日期字段，请使用此方法
import 'package:date_only_field/date_only_field_with_extensions.dart';

/// 如果只需要导入持续时间扩展，请使用此方法
import 'package:date_only_field/num_durations_extensions.dart';

使用示例

以下是一个简单的示例代码，展示了如何使用date_only_field插件来操作日期：

import 'package:date_only_field/date_only_field_with_extensions.dart';
import 'package:flutter/material.dart';

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

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        appBar: AppBar(title: Text("Date Only Field Example")),
        body: Center(
          child: DateFieldExample(),
        ),
      ),
    );
  }
}

class DateFieldExample extends StatefulWidget {
  @override
  _DateFieldExampleState createState() => _DateFieldExampleState();
}

class _DateFieldExampleState extends State<DateFieldExample> {
  Date selectedDate = Date.now();

  @override
  Widget build(BuildContext context) {
    return Column(
      mainAxisAlignment: MainAxisAlignment.center,
      children: [
        Text("Selected Date: ${selectedDate.format('dd-MM-yyyy')}"),
        ElevatedButton(
          onPressed: () async {
            final pickedDate = await showDatePicker(
              context: context,
              initialDate: selectedDate,
              firstDate: Date(2000),
              lastDate: Date(2100),
            );

            if (pickedDate != null && pickedDate != selectedDate) {
              setState(() {
                selectedDate = pickedDate;
              });
            }
          },
          child: Text("Select Date"),
        ),
      ],
    );
  }
}

辅助函数

以下是Date类的一些辅助函数和方法：

/// 构造函数
Date(int year, [int month = 1, int day = 1]);
Date.withFields({required int year, int month = 1, int day = 1}) : this(year, month, day);
Date.fromDateTime(DateTime dateTime);
Date.now();
Date.tomorrow();
Date.yesterday();
Date.parse(String formattedString, {String? dateFormat});
Date.tryParse(String formattedString);
Date.fromMillisecondsSinceEpoch(int millisecondsSinceEpoch, {bool isUtc = false});
Date.fromMicrosecondsSinceEpoch(int microsecondsSinceEpoch, {bool isUtc = false});

/// 获取器
int get millisecondsSinceEpoch;
int get microsecondsSinceEpoch;
int get weekday;

/// 辅助函数
String format([String? dateFormat]);
String formatWithDateFormat([DateFormat? dateFormat]);

DateTime toDateTime() => DateTime(year, month, day);
Date copyWith({int? year, int? month, int? day});

bool get isTomorrow;
bool get isToday;
bool get isYesterday;
bool get isFuture;
bool get isPast;

bool isBefore(Date other) === (this < other);
bool isEqualOrBefore(Date other) === (this <= other);
bool isAfter(Date other) === (this > other);
bool isEqualOrAfter(Date other) === (this >= other);
bool isSameAs(Date other) === bool equals(Date other) === (this == other);

bool operator <(Date other);
bool operator <=(Date other);
bool operator >(Date other);
bool operator >=(Date other);

bool isSameWeek(Date other);
bool isSameMonth(Date other);

Date add(dynamic other) === this + other;
Date subtract(dynamic other) === this - other;

Duration difference(dynamic other);

Date get lastDayOfMonth;
bool get isLastDayOfMonth;
bool get isFirstDayOfMonth;
Date get firstDayOfMonth;
Date get firstDayOfWeek;
Date get previousMonth;
Date get nextMonth;

static Date getLastDayOfWeek(Date day);
static List<Date> daysInMonth(Date monthDate);
static Date getFirstDayOfMonth(Date date);
static Date getLastDayOfMonth(Date date);
static Iterable<Date> daysInRange(Date start, Date end);

static Date getPreviousMonth(Date m);
static Date getNextMonth(Date m);
static Date previousWeek(Date w);
static Date nextWeek(Date w);