本文介绍了如何唤醒iPhone的最后一个月份日期作为参数的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!

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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11-01 03:09