Deleting an event from iPhone's calendar - ios

Question

I am trying to delete an event from the Calendar on user request. This is what I've come up with:
// Deleting Event
EKEventStore *eventStore = [[EKEventStore alloc] init];
EKEvent *event = [EKEvent eventWithEventStore:eventStore];
event.title = appDelegate.title1;
event.startDate = appDelegate.recAddDate;
event.endDate = appDelegate.currentDateName;
[event setCalendar:[eventStore defaultCalendarForNewEvents]];
NSError *err;
[eventStore removeEvent:event span:EKSpanThisEvent error:&err];
Below is the function I'm calling to remove the event from the event array. Items array is used to fetch events from iPhone calendar
- (BOOL)removeEvent:(EKEvent *)event span:(EKSpan)span error:(NSError **)error{
VoiceRecorderAppDelegate *appDelegate = (VoiceRecorderAppDelegate *)[[UIApplication sharedApplication] delegate];
[items removeObjectAtIndex:appDelegate.objectindexpath];
}

Answer 1

Firstly, save the eventId for the event while adding/saving events to the calendar.
[eventStore saveEvent:event span:EKSpanThisEvent error:&err];
NSString* str = [[NSString alloc] initWithFormat:#"%#", event.eventIdentifier];
[arrayofEventId addObject:str];
and then identify the event you want to remove ande then remove that event.
EKEventStore* store = [[EKEventStore alloc] init];
EKEvent* eventToRemove = [store eventWithIdentifier:[arrayofEventId objectAtIndex:i]];
if (eventToRemove != nil) {
NSError* error = nil;
[store removeEvent:eventToRemove span:EKSpanThisEvent error:&error];
}
Also don't forget to remove that event from arrayofEventId as well.

Answer 2

You can achieve this in the following ways:
By creating an NSpredicate using the date range withing which you
want to delete events, 86400 being the duration of a day in events, in
this piece of code I am deleting month old events. I am using a
dispatch queue, as the no. of events fetched may be large, and to keep the UI free.
First Create the event store and check access(access check required only iOS6 onwards):
- (void)addEventsToCalendar {
EKEventStore *eventStore = [[EKEventStore alloc] init];
if ([eventStore respondsToSelector:#selector(requestAccessToEntityType:completion:)]) {
//implementation for devices running OS version iOS 6.0 onwards.
[eventStore requestAccessToEntityType:EKEntityTypeEvent completion:^(BOOL granted, NSError *error) {
if (granted) {
[self removeEventsFromStore:eventStore];
} else {
//perform for No Access using Error
}];
} else {
//implementation for devices running OS version lower than iOS 6.0.
[self removeEventsFromStore:eventStore];
}
}
Then remove events from the store:
- (void)removeEventsFromStore:(EKEventStore*)eventStore {
NSDate *startDate = [NSDate dateWithTimeIntervalSinceNow:-30 * 86400];
NSDate *endDate = [NSDate date];
dispatch_queue_t queue = dispatch_queue_create("com.arc.calendar", NULL);
dispatch_async(queue, ^{
NSArray *calendarArray = [NSArray arrayWithObject:[PWCCalendar getCalendarForEventStore:eventStore]];
NSPredicate *predicate = [eventStore predicateForEventsWithStartDate:startDate endDate:[NSDate dateWithTimeInterval:ONE_DAY_DURATION sinceDate:endDate] calendars:calendarArray];
NSArray *eventArray = [eventStore eventsMatchingPredicate:predicate];
for (EKEvent *event in eventArray) {
[eventStore removeEvent:event span:EKSpanThisEvent commit:YES error:NULL];
}
dispatch_async(dispatch_get_main_queue(), ^{
//Get the main Queue and perform UPdates
});
});
}
This is the Long way, use it to delete events in bulk. But if you need to delete only One event, then save the events identifier to `NSUserDefaults(after generating the event)
[eventStore saveEvent:event span:EKSpanThisEvent commit:YES error:NULL];
[[NSUserDefaults standardUserDefaults] setObject:[event eventIdentifier] forKey:#"Event ID"];
and then fetch it back while removing using
[eventStore eventWithIdentifier:#"Event ID"];
and then remove it from the store using
[eventStore removeEvent:event span:EKSpanThisEvent commit:YES error:NULL];
For more clarifications on the other methods to fetch events or calendar, pelase refer to EventStore docs: http://developer.apple.com/library/ios/#documentation/EventKit/Reference/EKEventStoreClassRef/Reference/Reference.html#//apple_ref/doc/uid/TP40009567 or to the Calendar and Reminder Programming guide: http://developer.apple.com/library/ios/#documentation/DataManagement/Conceptual/EventKitProgGuide/Introduction/Introduction.html#//apple_ref/doc/uid/TP40009765