Is NSNotificationCenter necessary to cancel UILocalnotficiation? - ios

Question

I want to cancel a UILocalnotification , when i cancel notification still the notification is being fired . I wanted to know do i have to call any delegate method in appdelegate to cancel notification .the code which i am using is executing correctly .but the notification is getting fired .
Should i use NSNotification center which has removeObserver method to cancel uilocalnotification.
Does UILocalnotification fires notification from the app or from the device.
UPDATE - This is how i am scheduling my notification
-(UILocalNotification *)scheduleNotification :(int)remedyID
{
NSString *descriptionBody;
NSInteger frequency;
UILocalNotification *notif = [[UILocalNotification alloc] init];
NSLog(#"%d",remedyID);
descriptionBody =[[self remedyDetailsForRemedyID:remedyID] objectForKey:#"RemedyTxtDic"];
frequency = [[[self remedyDetailsForRemedyID:remedyID] objectForKey:#"RemedyFrequency"]intValue];
NSArray *notificationFireDates = [self fireDatesForFrequency:frequency];
for (NSDate *fireDate in notificationFireDates)
{
notif.timeZone = [NSTimeZone defaultTimeZone];
notif.repeatInterval = NSDayCalendarUnit;
notif.alertBody = [NSString stringWithString:descriptionBody];
notif.alertAction = #"Show me";
notif.soundName = UILocalNotificationDefaultSoundName;
notif.applicationIconBadgeNumber = 1;
notif.fireDate = fireDate;
NSDictionary *userDict = [NSDictionary dictionaryWithObjectsAndKeys:notif.alertBody, #"kRemindMeNotificationDataKey", [NSNumber numberWithInt:remedyID],kRemindMeNotificationRemedyIDKey,
nil];
notif.userInfo = userDict;
[[UIApplication sharedApplication] scheduleLocalNotification:notif];
}
return notif;
}
Cancelling notification
- (void)cancelNotification:(int)remedyId
{
NSArray *notifications = [[UIApplication sharedApplication] scheduledLocalNotifications];
NSLog(#"Cancelling... Before %d",[[[UIApplication sharedApplication]scheduledLocalNotifications]count]);
for (UILocalNotification *notification in notifications)
{
int notifRemedyId = [[notification.userInfo objectForKey:#"kRemindMeNotificationRemedyIDKey"]intValue];
NSLog(#"remedyID : %d",remedyId);
NSLog(#"notifyId : %d",notifRemedyId);
if (remedyId == notifRemedyId) {
[[UIApplication sharedApplication] cancelLocalNotification:notification];
}
}
NSLog(#"Cancelling... After %d",[[[UIApplication sharedApplication]scheduledLocalNotifications]count]);
}

Answer 1

NSNotification center which has removeObserver method to cancel uilocalnotification.
NSNotificationCenter has nothing to do with UILocalNotification. I'm sorry that they both use "notification" somewhere in their names, but that is just coincidence really.

Answer 2

scheduledLocalNotifications will give you the list of all scheduled notifications and use
- (void)cancelLocalNotification:(UILocalNotification *)notification
or you can cancel them all using:
[[UIApplication sharedApplication] cancelAllLocalNotifications];
Edit :
NSString *notifRemedyId = #"notifRemedyId";
UILocalNotification *localnotif=[[UILocalNotification alloc]init];
NSDictionary *userDict = [NSDictionary dictionaryWithObjectsAndKeys:#"kRemindMeNotificationRemedyIDKey", kRemindMeNotificationRemedyIDKey,YOUR_REMEDYID,#"notifRemedyId",nil];
localnotif.userInfo = userDict;
[[UIApplication sharedApplication] scheduleLocalNotification:localnotif];
Cancel as :
for (UILocalNotification *aNotif in [[UIApplication sharedApplication] scheduledLocalNotifications]) {
if ([[aNotif.userInfo objectForKey: kRemindMeNotificationRemedyIDKey] isEqualToString:#"kRemindMeNotificationRemedyIDKey"]) {
if (remedyId == [[aNotif.userInfo objectForKey: kRemindMeNotificationRemedyIDKey] intValue]) {
[[UIApplication sharedApplication] cancelLocalNotification:aNotif];
break;
}
}
}
Hope it helps you.