iphone - 如何将日期更改为当年？

Question

我有一个类似下面的数组

Birthdates(
"03/12/2013",
"03/12/2013",
"08/13/1990",
"12/09/1989",
"02/06",
"09/08",
"03/02/1990",
"08/22/1989",
"03/02",
"05/13",
"10/16",
"07/08",
"08/31/1990",
"04/14/1992",
"12/15/1905",
"08/14/1989",
"10/07/1987",
"07/25",
"07/17/1989",
"03/24/1987",
"07/28/1988",
"01/21/1990",
"10/13"
 )

都是NSString

现在我想从中创建另一个数组，其中所有年份都应该是 2013 年，如果该日期在当年，如果日期已经过去，那么将年份更改为 2014 年？

在上面的句子中，我们不考虑年份，我们只考虑日期和月份，然后查看当前年份是否已经过去？

例如，如果日期是“12/15/1905”，则将其转换为另一个数组，例如“12/15/2013”但如果日期类似于“01/01/1990”，则将其转换为另一个数组，如“01/01/2014”因为它已经过了当前日期请帮助提前谢谢你:)

我更愿意做一些代码不仅适用于 2013 年和 2014 年而且也适用于 future 的事情。

Answer 1

此代码将为您完成:

NSArray *Birthdates=@[
                      @"03/12/2013",
                      @"03/12/2013",
                      @"08/13/1990",
                      @"12/09/1989",
                      @"02/02",
                      @"09/08",
                      @"03/02/1990",
                      @"08/22/1989",
                      @"03/02"];
NSCalendar *gregorian = [[NSCalendar alloc] initWithCalendarIdentifier:NSGregorianCalendar];
NSDateComponents *components = [gregorian components:NSYearCalendarUnit fromDate:[NSDate date]];
NSInteger currentYear = [components year];

NSMutableArray *newBirthDates=[NSMutableArray new];

for(NSString *str in Birthdates){
    NSArray *array=[str componentsSeparatedByString:@"/"];
    if(array.count==2){
        NSString *tempString=[NSString stringWithFormat:@"%@/%d",str,currentYear];
        NSDateFormatter *dateFormatter=[NSDateFormatter new];
        [dateFormatter setDateFormat:@"MM/dd/yyyy"];
        NSDate *date=[dateFormatter dateFromString:tempString];
        if ([[NSDate date] isGreaterThanOrEqualTo:date]) {
            NSLog(@"passed->%@ *** %@",date, str);
            [newBirthDates addObject:[NSString stringWithFormat:@"%@/%d",str,currentYear+1]];
        }
        [newBirthDates addObject:tempString];
    }
    else{
        NSString *dateString=[NSString stringWithFormat:@"%@/%@/%d",array[0],array[1],currentYear];
        NSDateFormatter *dateFormatter=[NSDateFormatter new];
        [dateFormatter setDateFormat:@"MM/dd/yyyy"];
        NSDate *date=[dateFormatter dateFromString:dateString];
        if ([[NSDate date] isGreaterThanOrEqualTo:date]) {
            dateString=[NSString stringWithFormat:@"%@/%@/%d",array[0],array[1],currentYear+1];
        }

        [newBirthDates addObject:dateString];
    }
}
NSLog(@"%@",newBirthDates);

这是输出:

DocumentBased[6632:303] (
    "03/12/2014",
    "03/12/2014",
    "08/13/2013",
    "12/09/2013",
    "02/02/2014",
    "09/08/2013",
    "03/02/2014",
    "08/22/2013",
    "03/02/2014"
)