修改NSDate以表示从今天起的1个月

问题描述

我正在为正在处理的Cocoa应用程序添加重复事件。我每天和每周都重复，因为我可以定义这些数学（3600 * 24 * 7 = 1周）。我使用下面的代码修改日期：

I'm adding repeating events to a Cocoa app I'm working on. I have repeat every day and week fine because I can define these mathematically (3600*24*7 = 1 week). I use the following code to modify the date:

[NSDate dateWithTimeIntervalSinceNow:(3600*24*7*(weeks))]

我知道事件重复后已经过去了多少个月，但我不知道如何使NSDate对象代表未来1个月/ 3个月/ 6个月/ 9个月。理想情况下，我希望用户从10月14日起每月重复，并且每月重复14次。

I know how many months have passed since the event was repeated but I can't figure out how to make an NSDate object that represents 1 month/3 months/6 months/9 months into the future. Ideally I want the user to say repeat monthly starting Oct. 14 and it will repeat the 14th of every month.

推荐答案

与相同。 ）

从：

遵循以下建议：

NSDate *today = [NSDate date];

NSCalendar *gregorian = [[NSCalendar alloc] initWithCalendarIdentifier:NSGregorianCalendar];

NSDateComponents *components = [[NSDateComponents alloc] init];
components.month = 1;
NSDate *nextMonth = [gregorian dateByAddingComponents:components toDate:today options:0];
[components release];

NSDateComponents *nextMonthComponents = [gregorian components:NSYearCalendarUnit | NSMonthCalendarUnit fromDate:nextMonth];

NSDateComponents *todayDayComponents = [gregorian components:NSDayCalendarUnit fromDate:today];

nextMonthComponents.day = todayDayComponents.day;
NSDate *nextMonthDay = [gregorian dateFromComponents:nextMonthComponents];

[gregorian release];

可能有更直接或更有效的实现，但这应该是准确的，方向。

There may be a more direct or efficient implementation, but this should be accurate and should point in the right direction.

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