如何解决NSDate倒数天数
| 我想创建一个日期之前的天数倒计时。我对小时或分钟不感兴趣,而对从当前日期到设置日期的天数不感兴趣。这就是我一直在尝试的: NSDate *date = [NSDate date];
Nsstring *dateString = [date description];
// this **dateString** string will have **\"yyyy-MM-dd HH:mm:ss +0530\"**
// NSMutableString *mutString = dateString;
NSArray *arr = [dateString componentSeperatedByString:@\" \"];
// arr will have [0] -> yyyy-MM-dd,[1] -> HH:mm:ss,[2] -> +0530 (time zone)
但这不起作用,因为当前日期以分钟和秒为单位给出时间。
//NSDate *currentDate = [[NSDate alloc] init];
Nsstring *start = [arr objectAtIndex:0];//[Nsstring stringWithFormat:@\"%@\",currentDate];//@\"2011-11-05\";
NSLog(@\"%@\",start);
Nsstring *end = @\"2011-6-03\";
NSDateFormatter *f = [[NSDateFormatter alloc] init];
[f setDateFormat:@\"yyyy-MM-dd\"];
NSDate *startDate = [f dateFromString:start];
NSDate *endDate = [f dateFromString:end];
[f release];
NSCalendar *gregorianCalendar = [[NSCalendar alloc] initWithCalendarIdentifier:NSGregorianCalendar];
NSDateComponents *components = [gregorianCalendar components:NSDayCalendarUnit
fromDate:startDate
toDate:endDate
options:0];
NSInteger days = [components day];
[gregorianCalendar release];
NSLog(@\"%i\",days);
我不太了解这段代码,我不熟悉NSDate和格式化程序,但这是我的一堆Internet代码的组合。
提前致谢。解决方法
您可以通过这种方式计算从当天开始的天数。
NSDate NewDate =这是您的比较日期;
NSDateComponents * dateComp = [[NSDateComponents alloc] init];
NSCalendar *Calander = [[NSCalendar alloc] initWithCalendarIdentifier:NSGregorianCalendar];
NSDateFormatter *dateFormat=[[NSDateFormatter alloc] init];
NSDateComponents *comps=[[NSDateComponents alloc] init];
unsigned int unitFlags = NSDayCalendarUnit | NSMonthCalendarUnit | NSYearCalendarUnit | NSHourCalendarUnit | NSMinuteCalendarUnit | NSSecondCalendarUnit;
dateComp = [Calander components:unitFlags fromDate:[NSDate date]];
[dateFormat setDateFormat:@\"dd\"];
[comps setDay:[[dateFormat stringFromDate:[NSDate date]] intValue]];
[dateFormat setDateFormat:@\"MM\"];
[comps setMonth:[[dateFormat stringFromDate:[NSDate date]] intValue]];
[dateFormat setDateFormat:@\"yyyy\"];
[comps setYear:[[dateFormat stringFromDate:[NSDate date]] intValue]];
[dateFormat setDateFormat:@\"HH\"];
[comps setHour:05];
[dateFormat setDateFormat:@\"mm\"];
[comps setMinute:30];
NSDate *currentDate=[Calander dateFromComponents:comps];
//NSLog(@\"Current Date is :- \'%@\'\",currentDate);
dateComp = [Calander components:unitFlags fromDate:newDate];
[dateFormat setDateFormat:@\"dd\"];
[comps setDay:[[dateFormat stringFromDate:newDate] intValue]];
[dateFormat setDateFormat:@\"MM\"];
[comps setMonth:[[dateFormat stringFromDate:newDate] intValue]];
[dateFormat setDateFormat:@\"yyyy\"];
[comps setYear:[[dateFormat stringFromDate:newDate] intValue]];
[dateFormat setDateFormat:@\"HH\"];
[comps setHour:05];
[dateFormat setDateFormat:@\"mm\"];
[comps setMinute:30];
NSDate *reminderDate=[Calander dateFromComponents:comps];
//NSLog(@\"Current Date is :- \'%@\'\",reminderDate);
//NSLog(@\"Current Date is :- \'%@\'\",currentDate);
NSTimeInterval ti = [reminderDate timeIntervalSinceDate:currentDate];
//NSLog(@\"Time Interval is :- \'%f\'\",ti);
int days = ti/86400;
,您可以使用ѭ3来缩短时间:
NSDate* targetDate = ...
NSDate* today = [NSDate date]
NSCalendar* cal = [NSCalendar currentCalendar]
unsigned unitFlags = NSYearCalendarUnit | NSMonthCalendarUnit | NSDayCalendarUnit;
targetDate = [cal dateFromComponents:[cal components:unitFlags fromDate:targetDate]];
today = [cal dateFromComponents:[cal components:unitFlags fromDate:today]];
然后通过仅指定day
日期单位来获取天数的差异(如果没有上面的代码,这可能会起作用,我不确定):
int days = [[cal components:NSDayCalendarUnit fromDate:today toDate:targetDate options:0] day];
,使用以下代码,
NSTimeInterval dateDiff = [eventDate timeIntervalSinceNow];
int countDown=trunc(dateDiff/(60*60*24));
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