在iOS中添加一天到当前日期

时间:2013-06-21 08:29:35

标签: ios objective-c date

我看过这篇文章:iOS and finding Tomorrow

提供的代码是:

units = NSYearCalendarUnit | NSMonthCalendarUnit | NSDayCalendarUnit;
NSDateComponents* comps = [[NSCalendar currentCalendar] components:units fromDate:[NSDate date]]; 
// Add one day
comps.day = comps.day+1; // no worries: even if it is the end of the month it will wrap to the next month, see doc
// Recompose a new date, without any time information (so this will be at midnight)
NSDate* tomorrowMidnight = [[NSCalendar currentCalendar] dateFromComponents:comps];

问题:我需要在当前日期添加一天,例如,2013年6月21日到2013年5月21日之间的差异是1个月而不是0个月。

我正在使用的代码:

    NSDate *selectedDate = [picker2 date];
    unsigned int unitFlags = NSHourCalendarUnit | NSMinuteCalendarUnit | NSDayCalendarUnit | NSMonthCalendarUnit;
    NSDateComponents *conversionInfo = [currCalendar components:unitFlags fromDate:selectedDate toDate:[NSDate date]  options:0];
    DLog(@"%i",conversionInfo.month);
    DLog(@"%i",conversionInfo.day);
    conversionInfo.day +=1;
    DLog(@"%i",conversionInfo.day);
    DLog(@"%i",conversionInfo.month);
    int months = [conversionInfo month];

但是当我试图在2013年6月21日到2013年5月21日之间找到区别时 - >仍然会给我0个月而不是1个月。

需要一些帮助。

6 个答案:

答案 0 :(得分:15)

形成一个日期组件,其中包含您要添加到原始日期的天数。通过将此组件添加到原始日期,从当前日历形成日期。

NSDateComponents *dateComponents = [NSDateComponents new];
dateComponents.day = 1;
NSDate *newDate = [[NSCalendar currentCalendar]dateByAddingComponents:dateComponents 
                                                               toDate: selectedDate 
                                                              options:0];

答案 1 :(得分:8)

这是我使用的方法:

+ (NSDate *)addDays:(NSInteger)days toDate:(NSDate *)originalDate {
    NSDateComponents *components= [[NSDateComponents alloc] init];
    [components setDay:days];
    NSCalendar *calendar = [NSCalendar currentCalendar];
    return [calendar dateByAddingComponents:components toDate:originalDate options:0];
}

有了它,您可以根据需要添加任意天数。它也适用于负数,因此您可以减去天数。

答案 2 :(得分:3)

简单直接的解决方案:

NSDate *currentDate = [NSDate date];

NSDate *nextDate = [currentDate dateByAddingTimeInterval:(24*3600)]; 

这对我来说很好。

答案 3 :(得分:1)

对于快速的googlers:

NSCalendar.currentCalendar().dateByAddingUnit(NSCalendarUnit.CalendarUnitDay, value: 1, toDate: date, options: nil)!

答案 4 :(得分:0)

首先,您要为NSDateComponent分配日期而不是月份。 执行以下代码,找出inDate和newDate之间的区别

NSCalendar *calendar = [NSCalendar currentCalendar];
NSDateComponents *components = [calendar components:NSCalendarUnitMonth fromDate:inDate];

NSInteger monthFlag = 1; components.month = minuteFlag;

// Retrieve date with increased days count
NSDate *newDate = [[NSCalendar currentCalendar]
                   dateByAddingComponents:components
                                   toDate:monthFlag
                                  options:0];

答案 5 :(得分:0)

要在日期中添加任意数量的任何组件,例如:2天或2个月,1年,请执行以下操作:

Calendar.current.date(byAdding: DateComponents(month: -1), to: date)! //this create date with previous month for date.

您可以使用任何内容初始化DateComponents

public init(calendar: Calendar? = default, timeZone: TimeZone? = default, era: Int? = default, year: Int? = default, month: Int? = default, day: Int? = default, hour: Int? = default, minute: Int? = default, second: Int? = default, nanosecond: Int? = default, weekday: Int? = default, weekdayOrdinal: Int? = default, quarter: Int? = default, weekOfMonth: Int? = default, weekOfYear: Int? = default, yearForWeekOfYear: Int? = default)