Cancelling a specific UILocalNotification - iphone

Question

I have this code for local notification, and I have a scheduleNotification and clearNotification using my own method. These are the codes:
- (void)clearNotification {
[[UIApplication sharedApplication] cancelAllLocalNotifications];
}
- (void)scheduleNotification {
[reminderText resignFirstResponder];
[[UIApplication sharedApplication] cancelAllLocalNotifications];
Class cls = NSClassFromString(#"UILocalNotification");
if (cls != nil) {
UILocalNotification *notif = [[cls alloc] init];
notif.fireDate = [[datePicker date] dateByAddingTimeInterval:-30];
notif.timeZone = [NSTimeZone defaultTimeZone];
notif.alertBody = #"Evaluation Planner";
notif.alertAction = #"Details";
notif.soundName = UILocalNotificationDefaultSoundName;
notif.applicationIconBadgeNumber = 1;
NSDictionary *userDict = [NSDictionary dictionaryWithObject:reminderText.text forKey:kRemindMeNotificationDataKey];
notif.userInfo = userDict;
[[UIApplication sharedApplication] scheduleLocalNotification:notif];
[notif release];
}
}
These codes works well, but now I want to know how do I know which notification object will it delete. I would like to create an ID for a notification, meaning, one ID is equivalent to one notification. But I don't know at which part I should do that. Plus I need to find a way to include all this to be in a plist.
Hope somebody can help me. Thanks.

Answer 1

NSArray *notifications = [[UIApplication sharedApplication] scheduledLocalNotifications];
for (UILocalNotification *not in notifications) {
NSString *dateString=[not.userInfo valueForKey:#"EndDate"];
if([dateString isEqualToString:#"CompareString"])
{
[[UIApplication sharedApplication] cancelLocalNotification:not];
}
}
Give user info whenever you create local notification (this is a key-value pair).
Iterate through notifications (it contains All Local Notifications) and compare value for the known key. In the above example I am using EndDate as the key and CompareString as the value.
Its Working Fine With Me.
Cheers..

Answer 2

(void)cancelLocalNotification:(NSString*)notificationID
{
// UILocalNotification *cancelThisNotification = nil;
// BOOL hasNotification = NO;
for (int j =0;j<[[[UIApplication sharedApplication]scheduledLocalNotifications]count]; j++)
{
UILocalNotification *someNotification = [[[UIApplication sharedApplication]scheduledLocalNotifications]objectAtIndex:j];
if([[someNotification.userInfo objectForKey:#"drdid"] isEqualToString:notificationID])
{
NSLog(#"id,notificationID(App) %# %# ",[someNotification.userInfo objectForKey:#"drdid"],notificationID);
NSLog(#"canceled notifications %#",someNotification);
[[UIApplication sharedApplication] cancelLocalNotification:someNotification];
}
}
}

Answer 3

I would suggest using the userInfo property on UILocalNotification, as others have mentioned. A simpler implementation that the accepted answer would be:
for(UILocalNotification* notification in [[UIApplication sharedApplication]scheduledLocalNotifications])
{
if([[notification.userInfo objectForKey:#"notification_identifier"] isEqualToString:#"notification_001"])
{
[[UIApplication sharedApplication] cancelLocalNotification:notification];
}
}
A for loop like this is much simpler. I'm not sure if it's more or less optimal, but it's certainly easier to read, and I assume you only have a few notifications to loop through anyway.