NSUserNotificationCenter

gistfile1.m

//Initalize new notification
    NSUserNotification *notification = [[NSUserNotification alloc] init];
    //Set the title of the notification
    [notification setTitle:@"My Title"];
    //Set the text of the notification
    [notification setInformativeText:@"My Text"];
    //Set the time and date on which the nofication will be deliverd (for example 20 secons later than the current date and time)
    [notification setDeliveryDate:[NSDate dateWithTimeInterval:20 sinceDate:[NSDate date]]];
    //Set the sound, this can be either nil for no sound, NSUserNotificationDefaultSoundName for the default sound (tri-tone) and a string of a .caf file that is in the bundle (filname and extension)
    [notification setSoundName:NSUserNotificationDefaultSoundName];
    
    //Get the default notification center
    NSUserNotificationCenter *center = [NSUserNotificationCenter defaultUserNotificationCenter];
    //Scheldule our NSUserNotification
    [center scheduleNotification:notification];