如何唤醒iPhone的最后一个月份日期作为参数 [英] How to retrive Last date of month give month as parameter in iphone

问题描述

我想在iphone应用程序中检索给定月份的最后一个日期。有人可以告诉我如何实现这一点？我在stackoverflow上看到一些解决方案，但是他们只是给了最后一个月的DAY。

感谢。

更新：

  +（NSString *）getLastDateOfMonth：（NSString *）monthYearString {
 
 // NSString * inputDate = [NSString stringWithFormat：@％@％@，@01 ，monthYearString]; 
 NSString * inputDate = [NSString stringWithFormat：@％@％@，@01，@2012年5月]; 
 NSLog（@输入日期： - ％@，inputDate）; 
 
 NSDateFormatter * dateFormatter = [[NSDateFormatter alloc] init]; 
 [dateFormatter setDateFormat：@dd MMM yyyy]; 
 NSDate * date = [dateFormatter dateFromString：inputDate]; 
 
 NSCalendar * gregCalendar = [[[NSCalendar alloc] initWithCalendarIdentifier：NSGregorianCalendar] autorelease]; 
 
 NSDateComponents * components = [gregCalendar组件：NSMonthCalendarUnit | NSYearCalendarUnit fromDate：date]; 
 NSInteger月= [组件月]; 
 NSInteger year = [components year]; 
 
 if（month == 12）{
 [components setYear：year + 1]; 
 [components setMonth：1]; 
} 
 else {
 [components setMonth：month + 1]; 
} 
 [components setDay：1]; 
 
 NSDate * lastDate = [[gregCalendar dateFromComponents：components] dateByAddingTimeInterval：0]; 
 
 NSDateFormatter * outputFormatter = [[NSDateFormatter alloc] init]; 
 [outputFormatter setDateFormat：@MM / dd / yyyy]; 
 NSString * lastDateOfMonth = [outputFormatter stringFromDate：lastDate]; 
 
 return lastDateOfMonth; 
 
} 
  

如果我使用这个代码，在控制台中显示错误的输出如下

 输入日期： -  2012年5月1日
 LAST DATE月： -  06/01/2012 
  

解决方案

您可以使用此功能： -

  NSDate currDate = [NSDate date]; 
 
 NSDate * getLastDateMonth（NSDate * currDate）
 {
 
 NSCalendar * gregCalendar = [[NSCalendar alloc] initWithCalendarIdentifier：NSGregorianCalendar] autorelease]; 
 
 NSDateComponents * components = [gregCalendar组件：NSMonthCalendarUnit | NSYearCalendarUnit fromDate：currDate]; 
 NSInteger月= [组件月]; 
 NSInteger year = [components year]; 
 
 if（month == 12）{
 [components setYear：year + 1]; 
 [components setMonth：1]; 
} 
 else {
 [components setMonth：month + 1]; 
} 
 [components setDay：1]; 
 
 return [[gregCalendar dateFromComponents：components] dateByAddingTimeInterval：0]; 
} 
  

I want to retrieve the last date of given month in iphone app. Can anybody tell how can I achieve this? I saw some solution on stackoverflow , but they just giving last DAY of month.

Thanks.

UPDATE:

    +(NSString*)getLastDateOfMonth:(NSString *)monthYearString {

    //NSString *inputDate = [NSString stringWithFormat:@"%@ %@",@"01",monthYearString];
    NSString *inputDate = [NSString stringWithFormat:@"%@ %@",@"01",@"May 2012"];
    NSLog(@"Input date:- %@",inputDate);

    NSDateFormatter *dateFormatter = [[NSDateFormatter alloc]init];
    [dateFormatter setDateFormat:@"dd MMM yyyy"];
    NSDate *date = [dateFormatter dateFromString:inputDate];

    NSCalendar *gregCalendar=[[[NSCalendar alloc] initWithCalendarIdentifier:NSGregorianCalendar] autorelease];

    NSDateComponents *components=[gregCalendar components:NSMonthCalendarUnit|NSYearCalendarUnit fromDate:date];
    NSInteger month=[components month];
    NSInteger year=[components year];

    if (month==12) {
        [components setYear:year+1];
        [components setMonth:1];
    }
    else {
        [components setMonth:month+1];
    }
    [components setDay:1];

    NSDate *lastDate = [[gregCalendar dateFromComponents:components] dateByAddingTimeInterval:0];

    NSDateFormatter *outputFormatter = [[NSDateFormatter alloc]init];
    [outputFormatter setDateFormat:@"MM/dd/yyyy"];
    NSString *lastDateOfMonth = [outputFormatter stringFromDate:lastDate];

    return lastDateOfMonth;

}

If I use this code it showing me wrong output in console as follows

    Input date:- 01 May 2012
LAst DAte in Month:- 06/01/2012

解决方案

You can do that by using this function :-

 NSDate currDate=[NSDate date];

NSDate *getLastDateMonth(NSDate *currDate)
{

    NSCalendar *gregCalendar=[[[NSCalendar alloc] initWithCalendarIdentifier:NSGregorianCalendar] autorelease];

    NSDateComponents *components=[gregCalendar components:NSMonthCalendarUnit|NSYearCalendarUnit fromDate:currDate];
    NSInteger month=[components month];
    NSInteger year=[components year];

    if (month==12) {
        [components setYear:year+1];
        [components setMonth:1];
    }
    else {
        [components setMonth:month+1];
    }
    [components setDay:1];

    return [[gregCalendar dateFromComponents:components] dateByAddingTimeInterval:0];
    }

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