Question

我列出了当月订单中的生日列表（8月，9月...... 7月）

我已经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"

它在当前年份内计算。我想在12月之后根据明年计算。

任何想法请帮助我。

Answer 1

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），可以为您提供帮助。

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。你可以打印和检查。祝好运。：）

以ios计算当前年份与给定年份之间的天数

1 个答案: