Question

目前我有以下代码将我的日子增加到下一个星期五，但我需要的是获得当周的星期五。例如，如果它是03/01的最后一个星期日。我希望我的回复是上周五（02/28），而不是周五（03/06）。

我已经检查了其他答案，但我对如何实现一种干净的方法来解决这个问题感到困惑。

+ (NSDate *)getLastFridayYearsMonthStartingDate:(NSDate *)date {

NSDateComponents *dateComponents = [[NSCalendar gregorianCalendar] components:NSYearCalendarUnit|NSCalendarUnitDay|NSCalendarUnitMonth|NSWeekdayCalendarUnit
                                                                     fromDate:date];

     // Set date to last year, +1 to account for previous business day
     [dateComponents setYear: -1];
     [dateComponents setDay:[dateComponents day]+1];


    // We always want the start date to be the friday of the given week, so we will increment the difference if not
    if ([dateComponents weekday] != 6) {
        NSInteger daysToFriday = (13 - [dateComponents weekday]) % 7;
        [dateComponents setDay:[dateComponents day]+daysToFriday];
    }

    NSDate *fridayDate = [[NSCalendar gregorianCalendar] dateFromComponents:dateComponents];

    return fridayDate;
}

Answer 1

尝试使用setWeekday设置特定日期

-(NSDate *) getFriday:(NSDate *)date {
    NSCalendar *cal = [[NSCalendar alloc] initWithCalendarIdentifier:NSGregorianCalendar];
    [cal setTimeZone:[NSTimeZone systemTimeZone]];

    NSDateComponents *comp = [cal components:NSYearCalendarUnit | NSWeekCalendarUnit | NSHourCalendarUnit | NSMinuteCalendarUnit | NSSecondCalendarUnit fromDate:date];


    [comp setWeekday:6];
    [comp setHour:0];
    [comp setMinute:0];
    [comp setSecond:0];
    return [cal dateFromComponents:comp];
}

将NSDate更改为该周的周五

1 个答案: