EKAlarm will not set in iOS 5

问题

I wrote the following snippet to create an event. Setting the alarm works fine in iOS 4, but in iOS 5 it doesn't get set. Is this a bug or am I missing something?

EKCalendar *cal = [self.eventStore defaultCalendarForNewEvents];
EKEvent *event = [EKEvent eventWithEventStore:self.eventStore];
event.calendar = cal;
// .......
EKAlarm *alarm = [EKAlarm alarmWithRelativeOffset:-3600];
event.alarms = [NSArray arrayWithObject:alarm];
// .......

回答1:

I had the same error.

The problem seems that startDate shoudln't be the same as endDate... really silly iOS change!

回答2:

It seems to be related to that's happening in this ticket: EventKit - App freezes when adding an EKEvent with 2 alarms (iOS 5).

If you take a look at the EventKit section in the iOS 5 changes from iOS 4.3 document, it mentions that some items are deprecated for EKEvent. The hierarchy has changed and a new abstract superclass has been added: EKCalendarItem.

回答3:

Avoid manipulating the alarms array. You need to add the alarm to your event like this:

EKAlarm *reminder = [EKAlarm alarmWithRelativeOffset:-300];
[event addAlarm:reminder];

This will add a reminder 5 minutes before the start time.

来源：https://stackoverflow.com/questions/7745725/ekalarm-will-not-set-in-ios-5