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我已经按当月顺序列出了生日列表（八月，九月....七月）

我计算了当前日期和生日列表日期之间的天数。

在 ViewDidLoad 方法中

NSDateFormatter *curdatemonthnoformatter = [[NSDateFormatter alloc] init];
    [curdatemonthnoformatter setDateStyle:NSDateFormatterMediumStyle];
    [curdatemonthnoformatter setDateFormat:@"dd-MM"];
    NSString * curdatemonthnostring = [curdatemonthnoformatter stringFromDate:[NSDate date]];
    [curdatemonthnoformatter release];


    NSDateFormatter *tempFormatter = [[NSDateFormatter alloc]init];
    [tempFormatter setDateFormat:@"dd-MM"];
    NSDate *startdate = [tempFormatter dateFromString:curdatemonthnostring];
    NSLog(@"%@",startdate);
    [tempFormatter release];


    NSLog(@"%@",curdatemonthnostring);

    for (int val=0; val<[monthlistArray count]; val++)
    {
        NSMutableArray * dataarraylocal = [[[NSMutableArray alloc]initWithCapacity:0]autorelease];

        for (int ival=0; ival<[[monthdataArray objectAtIndex:val]count]; ival++)

        {
            NSString *birthdatestr=[NSString stringWithFormat:@"%@",[[[monthdataArray objectAtIndex:val]objectAtIndex:ival]objectForKey:@"birthday"]];

            NSDate *mybirthdate=[formatter dateFromString:birthdatestr];
            NSDateFormatter *birthdatemonthFormatter = [[NSDateFormatter alloc] init];
            [birthdatemonthFormatter setDateStyle:NSDateFormatterMediumStyle];
            [birthdatemonthFormatter setDateFormat:@"dd-MM"];
            NSString *sortmonthstr = [birthdatemonthFormatter stringFromDate:mybirthdate];

            NSDateFormatter *tempFormatter1 = [[[NSDateFormatter alloc]init]autorelease];
            [tempFormatter1 setDateFormat:@"dd-MM"];
            NSDate *toDate = [tempFormatter1 dateFromString:sortmonthstr];
            [dataarraylocal addObject:toDate];

        }
        [previouscomparearray addObject:dataarraylocal];
    }


    NSLog(@"%@",previouscomparearray);

    for (int ival=0; ival<[monthlistArray count]; ival++)
    {
        NSMutableArray *nofdayslocal=[[NSMutableArray alloc]initWithCapacity:0];
        for (int jval=0; jval<[[monthdataArray objectAtIndex:ival]count]; jval++)
        {
            unsigned flags = NSDayCalendarUnit;
            NSDateComponents *difference = [[NSCalendar currentCalendar] components:flags fromDate:startdate toDate:[[previouscomparearray objectAtIndex:ival]objectAtIndex:jval] options:0];

            int dayDiff = [difference day];

            NSLog(@"%d",dayDiff);

            [nofdayslocal addObject:[NSNumber numberWithInt:dayDiff]];

        }

        [comparedatearray addObjectsFromArray:nofdayslocal];
    }

    NSLog(@"%@",comparedatearray);

输出：

"-8",
"-5",
"-1",
31,
83,
115,
"-220",
"-154",
"-154",
"-130",
"-90",
"-80",
"-73",
"-68",
"-63",
"-44",
"-42"

它是在当年计算的。我想在 12 月之后它会根据明年计算。

任何想法请帮助我。

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1 回答 1

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您可以找到日期和时间编程的完整指南。这是一个链接（https://developer.apple.com/library/mac/documentation/Cocoa/Conceptual/DatesAndTimes/Articles/dtCalendricalCalculations.html#//apple_ref/doc/uid/TP40007836-SW1），它可以帮助您该怎么办。

NSString *first = @"2010-10-09";
NSString *second = @"2011-12-10";

NSDateFormatter *form = [[NSDateFormatter alloc] init];
[form setDateFormat:@"yyyy-MM-dd"];

NSDate *startDate = [form dateFromString:first];
NSDate *endDate = [form dateFromString:second];

NSCalendar *gregorianCalendar = [[NSCalendar alloc] initWithCalendarIdentifier:NSGregorianCalendar];

NSDateComponents *comp = [gregorianCalendar components:NSDayCalendarUnit
                                                fromDate:startDate
                                                  toDate:endDate
                                                 options:0];

comp 会有天数的差异。您可以打印和检查。祝你好运。:)

于 2013-08-28T05:06:11.003 回答