Local Notification on ViewController - iphone

Question

I have the following code in ViewController.m:
-(void) checker {
UILocalNotification *notification = [[UILocalNotification alloc] init];
[notification setAlertBody: #"Im your local notification"];
[notification setFireDate: [NSDate dateWithTimeIntervalSinceNow: 1]];
[notification setTimeZone: [NSTimeZone defaultTimeZone]];
[UIApplication setScheduledLocalNotifications: [NSArray arrayWithObject: notification]];
}
The last line produces a warning:
Class method '+setScheduledLocalNotifications' not found (return type defaults to id)
and it gives error while processing. How can I instantiate the notification? As I said I am new, if you can provide a complete answer it will be greatly appreciated.
Edit: I have a timer that repeats itself every 60 seconds and calls a function that puts a notification.
timer = [NSTimer scheduledTimerWithTimeInterval:60 target:self selector:#selector(checker) userInfo:nil repeats:YES];
/* ... */
-(void)checker {
NSLog(#"Notification routine");
UIApplication* app = [UIApplication sharedApplication];
NSArray *oldNotifications = [app scheduledLocalNotifications];
// Clear out the old notification before scheduling a new one.(if needed)
if ([oldNotifications count] > 0)
[app cancelAllLocalNotifications];
// Create a new notification.
UILocalNotification* alarm = [[[UILocalNotification alloc] init] autorelease];
if (alarm) {
alarm.fireDate = [NSDate dateWithTimeIntervalSinceNow:10];
alarm.timeZone = [NSTimeZone defaultTimeZone];
alarm.repeatInterval = 0;
alarm.alertBody = #"Msg to show";
[app scheduleLocalNotification:alarm];
}
}
I can see the log only firing once a minute, but the oldNotifications count does not increase.

Answer 1

[[UIApplication sharedApplication] scheduleLocalNotification:notification];
the '+' in the error message means it is trying to call a class method rather than an instance method. The [UIApplication sharedApplication] call will return the singleton instance of the application object that allows you to call that method as an instance method.
Also you should read the documentation for UIApplication. You just need to call scheduleLocalNotification: with the notification object to get it scheduled. This will allow you to release the memory to the object, because the schedule method will copy the object.

Answer 2

This is how I do it,
UIApplication* app = [UIApplication sharedApplication];
NSArray *oldNotifications = [app scheduledLocalNotifications];
// Clear out the old notification before scheduling a new one.(if needed)
if ([oldNotifications count] > 0)
[app cancelAllLocalNotifications];
// Create a new notification.
UILocalNotification* alarm = [[[UILocalNotification alloc] init] autorelease];
if (alarm)
{
alarm.fireDate = [NSDate dateWithTimeIntervalSinceNow:60*60];//afterone hour
alarm.timeZone = [NSTimeZone defaultTimeZone];
alarm.repeatInterval = 0;
alarm.soundName = #"alarmsound.caf";
alarm.alertBody = #"Msg to show";
[app scheduleLocalNotification:alarm];
}
update:
- (void)scheduleAlarmForDate:(NSDate*)theDate andBody:(NSString*)Body
{
UIApplication* app = [UIApplication sharedApplication];
NSArray *oldNotifications = [app scheduledLocalNotifications];
// Clear out the old notification before scheduling a new one.
if ([oldNotifications count] > 0)
[app cancelAllLocalNotifications];
// Create a new notification.
UILocalNotification* alarm = [[UILocalNotification alloc] init];//Using ARC no autorelease
if (alarm)
{
alarm.fireDate = theDate;
alarm.timeZone = [NSTimeZone defaultTimeZone];
alarm.repeatInterval = 0;
alarm.soundName = #"alarmsound.caf";
alarm.alertBody = Body;
[app scheduleLocalNotification:alarm];
}
}
now if I call this method twice,
NSDate *fireDate1 = [NSDate dateWithTimeIntervalSinceNow:4.0];
[self scheduleAlarmForDate:fireDate1 andBody:#"My alertBody 1"];
NSDate *fireDate2 = [NSDate dateWithTimeIntervalSinceNow:6.0];
[self scheduleAlarmForDate:fireDate2 andBody:#"My alertBody 2"];
the first alarm will be canceled,,