是一个相同的星期，月，年的另一个日期在swift中的日期 [英] Is a date in same week, month, year of another date in swift

问题描述

了解日期与同一周（或年或月）的最佳方式是什么，最好是扩展名，仅使用Swift ？

What is the best way to know if a date is in the same week (or year or month) as another, preferably with an extension, and solely using Swift?

例如，在Objective-C中我有

As an example, in Objective-C I have

- (BOOL)isSameWeekAs:(NSDate *)date {
    NSDateComponents *otherDay = [[NSCalendar currentCalendar] components:NSCalendarUnitEra | NSCalendarUnitYear | NSCalendarUnitMonth | NSCalendarUnitDay fromDate:self];
    NSDateComponents *today = [[NSCalendar currentCalendar] components:NSCalendarUnitEra | NSCalendarUnitYear | NSCalendarUnitMonth | NSCalendarUnitDay fromDate:date];
    return ([today weekOfYear]   == [otherDay weekOfYear] &&
            [today year]         == [otherDay year] &&
            [today era]          == [otherDay era]);
}

请不要提出桥接日期的解决方案到 NSDate

推荐答案

您可以使用日历方法 isDate（equalTo：granularity：）将其检查如下：

You can use calendar method isDate(equalTo:granularity:) to check it as follow:

extension Date {
    func isInSameWeek(date: Date) -> Bool {
        return Calendar.current.isDate(self, equalTo: date, toGranularity: .weekOfYear)
    }
    func isInSameMonth(date: Date) -> Bool {
        return Calendar.current.isDate(self, equalTo: date, toGranularity: .month)
    }
    func isInSameYear(date: Date) -> Bool {
        return Calendar.current.isDate(self, equalTo: date, toGranularity: .year)
    }
    func isInSameDay(date: Date) -> Bool {
        return Calendar.current.isDate(self, equalTo: date, toGranularity: .day)
    }
    var isInThisWeek: Bool {
        return isInSameWeek(date: Date())
    }
    var isInToday: Bool {
        return Calendar.current.isDateInToday(self)
    }
    var isInTheFuture: Bool {
        return Date() < self
    }
    var isInThePast: Bool {
        return self < Date()
    }
}

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