每14天（两周）后重复一次本地通知？ [英] Repeating a Local Notification after every 14 days(two weeks)?

问题描述

在我的应用中，我要设置重复的 UILocalNotification 。我可以通过执行每日，每周等设置repeatInterval

In my app i've to set repetitive UILocalNotification. I'm able to set repeatInterval as daily, weekly etc by doing

UILocalNotification *localNotification = [[UILocalNotification alloc] init];
localNotification.repeatInterval = NSDayCalendarUnit; // or any other calendarUnit

好的..没关系，但我要为每个设置repeatInterval 14天。
i来自此链接，我们知道了只能使用NSCalendarUnit重复间隔之一。因此，您可以重复间隔为一分钟或一小时或一天但不是五分钟或三小时或14天。关于iOS 5或更高版本中此限制的任何想法（该文章是为iOS 4.0编写的）？

Ok..it's fine, but i've to set repeatInterval for every 14 days. i came to know from this link that we can only use one of the NSCalendarUnit repeat intervals. So you can have a repeat interval of one minute or one hour or one day but not five minutes or three hours or 14 days. Any Idea about this limitation in iOS 5 or later(that article was written for iOS 4.0)?

推荐答案

您只能设置重复间隔到日历单位。为了获得正确的时间间隔，您可能需要设置几个通知。

You can only set the repeat interval to a calendar unit. In order to get the right time interval you may have to set several notifications though.

如果您例如每20分钟想要一个通知，则必须创建3个通知20分钟与NSHourCalendarUnit的重复间隔。

If you for instance wanted a notification every 20 minutes you would have to create 3 notifications 20 minutes apart with a repeat interval of NSHourCalendarUnit.

您的案例中的问题是，从周单位开始的下一件事是一个月，但一个月不完全是4周。

The problem in your case is that the next thing up from the week unit is a month but a month is not exactly 4 weeks.

要实际设置每14天的通知，您必须创建26个通知，重复间隔为NSYearCalendarUnit。

To actually set a notification for every 14 days you will have to create 26 notifications with a repeat interval of NSYearCalendarUnit.

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