Cancel UILocalNotification

Question

I have a problem with my UILocalNotification.

I am scheduling the notification with my method.

- (void) sendNewNoteLocalReminder:(NSDate *)date  alrt:(NSString *)title {     // some code ...     UILocalNotification *localNotif = [[UILocalNotification alloc] init];       if (localNotif == nil)           return;      localNotif.fireDate = itemDate;      localNotif.timeZone = [NSTimeZone defaultTimeZone];     localNotif.alertAction = NSLocalizedString(@"View Details", nil);      localNotif.alertBody = title;     localNotif.soundName = UILocalNotificationDefaultSoundName;      localNotif.applicationIconBadgeNumber = 0;      NSDictionary *infoDict = [NSDictionary dictionaryWithObject:stringID forKey:@"id"];      localNotif.userInfo = infoDict;       [[UIApplication sharedApplication] scheduleLocalNotification:localNotif];      [localNotif release]; } 

Its work fine and I'm correctly receiving the notification. The problem is when I should cancel the notification. Im using this method.

- (void) deleteNewNoteLocalReminder:(NSString*) reminderID noteIDe:(NSInteger)noteIDE {     [[UIApplication sharedApplication] cancelLocalNotification:(UILocalNotification *)notification ????   } 

Im not sure what to do here, but my questions are:

How do I know which UILocalNotification object I should delete?
Is there a way to list all notifications?

The only thing I have is the ID of which reminder I should delete.
I was thinking about to save the UILocalNotification object in my "Note" object and get it that way, and when I saving to my SQLite database serialize the object and so on ... is there a smarter way?

Answer 1

My solution is to use the UILocalNotification userInfo dictionary. In fact what I do is to generate a unique ID for each of my notifications (of course this ID is something I'm able to retrieve later), then when I want to cancel the notification associated to a given ID I will simply scan all available notifications using the array:

[[UIApplication sharedApplication] scheduledLocalNotifications] 

and then I try to match the notifications by investigating the ID. E.g.:

 NSString *myIDToCancel = @"some_id_to_cancel"; UILocalNotification *notificationToCancel=nil; for(UILocalNotification *aNotif in [[UIApplication sharedApplication] scheduledLocalNotifications]) {   if([[aNotif.userInfo objectForKey:@"ID"] isEqualToString:myIDToCancel]) {      notificationToCancel=aNotif;      break;   } } if(notificationToCancel) [[UIApplication sharedApplication] cancelLocalNotification:notificationToCancel]; 

I don't know if this approach is better or not with respect to the Archiving/Unarchving one, however it works and limits data to be saved to just an ID.

Edit: there was a missing braket

Answer 2

You can get a list of all scheduled notifications from scheduledLocalNotifications or you can cancel them all:

  [[UIApplication sharedApplication] cancelAllLocalNotifications];