如何在Objective-c中获取下周的开始和结束日期？答案

【问题标题】：How to get next week start and end date in Objective-c?如何在Objective-c中获取下周的开始和结束日期？
【发布时间】：2018-05-31 10:23:04
【问题描述】：

我试图获取下周的开始和结束日期，但我得到了当前周的开始和结束日期。如何在 Objective-c 中获取下周的开始和结束日期。

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标签： objective-c

【解决方案1】：

NSCalendar 包含执行此操作的专用方法，例如 nextDateAfterDate:matchingUnit:value:options: 和 dateByAddingComponents:toDate:options:

// Get the current calendar
NSCalendar *calendar = [NSCalendar currentCalendar];
// Get the next occurrence for the first weekday of the current calendar
NSDate *startOfNextWeek = [calendar nextDateAfterDate:[NSDate date] matchingUnit:NSCalendarUnitWeekday value:calendar.firstWeekday options:NSCalendarMatchStrictly];
// Create new date components +7 days and -1 seconds
NSDateComponents *endOfNextWeekComponents = [[NSDateComponents alloc] init];
endOfNextWeekComponents.day = 7;
endOfNextWeekComponents.second = -1;
// Add the date components to the start date to get the end date.
NSDate *endOfNextWeek = [calendar dateByAddingComponents:endOfNextWeekComponents toDate:startOfNextWeek options:NSCalendarMatchStrictly];

NSLog(@"%@ - %@", startOfNextWeek, endOfNextWeek);

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【解决方案2】：

您可以使用以下代码获取本周和下周的所有日期：-

NSArray * allDatesOfThisWeek = [self daysThisWeek];
NSArray * allDatesOfNextWeek = [self daysNextWeek];

以下方法用于计算本周日期：-

-(NSArray*)daysThisWeek
{
     return  [self daysInWeek:0 fromDate:[NSDate date]];
}

-(NSArray*)daysNextWeek
{
    return  [self daysInWeek:1 fromDate:[NSDate date]];
}
-(NSArray*)daysInWeek:(int)weekOffset fromDate:(NSDate*)date
{
    NSCalendar *calendar = [NSCalendar currentCalendar];

    //ask for current week
    NSDateComponents *comps = [[NSDateComponents alloc] init];
    comps=[calendar components:NSWeekCalendarUnit|NSYearCalendarUnit fromDate:date];
    //create date on week start
    NSDate* weekstart=[calendar dateFromComponents:comps];

    NSDateComponents* moveWeeks=[[NSDateComponents alloc] init];
    moveWeeks.weekOfYear=weekOffset;            
    weekstart=[calendar dateByAddingComponents:moveWeeks toDate:weekstart options:0];


    //add 7 days
    NSMutableArray* week=[NSMutableArray arrayWithCapacity:7];
    for (int i=1; i<=7; i++) {
        NSDateComponents *compsToAdd = [[NSDateComponents alloc] init];
        compsToAdd.day=i;
        NSDate *nextDate = [calendar dateByAddingComponents:compsToAdd toDate:weekstart options:0];
        [week addObject:nextDate];

    }
    return [NSArray arrayWithArray:week];
}

如果您想从今天开始获取下周的日期，则像这样传递 weekOffset=2：-

NSArray * allDatesOfNextToNextWeek = [self daysInWeek:2 fromDate:now];

如果您想从今天开始获取前一周的日期，请像这样传递 weekOffset=-1：-

NSArray * allDatesOfPreviousWeek = [self daysInWeek:-1 fromDate:now];

希望，这就是您要找的。有任何问题可以联系我。

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