Delay in invokation of UILocalNotification

Question

I have made an app which is an Customized Alarm App. The UILocalNotification should invoke at the time selected by me in UIDatePicker, but is is not invoking at correct timing. For example, I selected the time as 2:00PM for the alarm, so the notification will invoke between 2:00PM and 2:01PM... but not sure when... it is giving me a delay of random time. In my UITableView you can see that it is the description displayed is also comes wrong. I know I am from India so it showing GMT timings, but can it could be corrected?

Here is my whole code:- -----------------------------AppDelegate.m File :------------------------------

@synthesize window,viewController,timeViewController;
NSString *kRemindMeNotificationDataKey = @"kRemindMeNotificationDataKey";
#pragma mark -
#pragma mark === Application Delegate Methods ===
#pragma mark -
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {    
    int x = [[NSUserDefaults standardUserDefaults] integerForKey:@"Mayank"];
    if( x == 1 )
    {
        timeViewController = [[TimeViewController alloc]initWithNibName:@"TimeViewController" bundle:nil];
        timeViewController.modalTransitionStyle = UIModalTransitionStyleCrossDissolve;
        CGRect statusBarFrame = [UIApplication sharedApplication].statusBarFrame;
        CGRect frame = timeViewController.view.frame;
        frame.origin = CGPointMake(frame.origin.x,frame.origin.y + statusBarFrame.size.height );
        timeViewController.view.frame = frame;
        [self.window addSubview:timeViewController.view];
    }
    else
    {
        [[NSUserDefaults standardUserDefaults]setInteger:1 forKey:@"Mayank"];
        [[NSUserDefaults standardUserDefaults]synchronize]; 
        UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Do you want to set the Default Alarm?" message:@"at 4:20 PM" delegate:self cancelButtonTitle:@"Cancel" otherButtonTitles:@"Ok",nil];
        [alert show];
        [alert release];
    }
    sleep(1);
    [self.window makeKeyAndVisible];
    application.applicationIconBadgeNumber = 0;
    // Handle launching from a notification
    UILocalNotification *localNotification =
    [launchOptions objectForKey:UIApplicationLaunchOptionsLocalNotificationKey];
    if (localNotification) {
        NSString *reminderText = [localNotification.userInfo 
                                  objectForKey:kRemindMeNotificationDataKey];
        [viewController showReminder:reminderText];
    }
    return YES;
}
- (void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex
{
    if(buttonIndex == 0)
    {
        timeViewController = [[TimeViewController alloc]initWithNibName:@"TimeViewController" bundle:nil];
        timeViewController.modalTransitionStyle = UIModalTransitionStyleCrossDissolve;
        CGRect statusBarFrame = [UIApplication sharedApplication].statusBarFrame;
        CGRect frame = timeViewController.view.frame;
        frame.origin = CGPointMake(frame.origin.x,frame.origin.y + statusBarFrame.size.height );
        timeViewController.view.frame = frame;
        [self.window addSubview:timeViewController.view];
    }
    if(buttonIndex == 1)
    {
        viewController = [[SetAlarmViewController alloc]initWithNibName:@"SetAlarmViewController" bundle:nil];
        viewController.modalTransitionStyle = UIModalTransitionStyleCrossDissolve;
        CGRect statusBarFrame = [UIApplication sharedApplication].statusBarFrame;
        CGRect frame = viewController.view.frame;
        frame.origin = CGPointMake(frame.origin.x,frame.origin.y + statusBarFrame.size.height );
        viewController.view.frame = frame;
        [self.window addSubview:viewController.view];       
    }
}
- (void)application:(UIApplication *)application 
didReceiveLocalNotification:(UILocalNotification *)notification {
    NSString *reminderText = [notification.userInfo
                              objectForKey:kRemindMeNotificationDataKey];
    [viewController showReminder:reminderText];
    application.applicationIconBadgeNumber = 0;
}

-----------------------------mainViewController.m File :------------------------------

@implementation SetAlarmViewController
@synthesize datePicker,tableview, eventText,titleBar,setAlarmButton,returnKeyType;


// Implement viewDidLoad to do additional setup after loading the view, typically from a nib.
- (void)viewDidLoad {

    [super viewDidLoad];

    appDelegate = (The420DudeAppDelegate *)[[UIApplication sharedApplication] delegate];    
    eventText.returnKeyType = UIReturnKeyDone;

//  datePicker.minimumDate = [NSDate date];
    NSDate *now = [NSDate date];
    [datePicker setDate:now animated:YES];
    eventText.delegate = self;
    index = 0;
}

-(void)viewDidAppear:(BOOL)animated
{
    [super viewDidAppear:YES];
    [self.tableview reloadData];
}

- (IBAction) scheduleAlarm:(id) sender {
    [eventText resignFirstResponder];

// Get the current date
    NSDate *pickerDate = [self.datePicker date];

    UILocalNotification *localNotif = [[UILocalNotification alloc] init];
    if (localNotif == nil)
        return;
    localNotif.fireDate = pickerDate;
//  NSLog(@"%@",localNotif.fireDate);
    localNotif.timeZone = [NSTimeZone defaultTimeZone];
//  NSLog(@"%@",localNotif.timeZone);

    // Notification details
    localNotif.alertBody = [eventText text];

    // Set the action button
    localNotif.alertAction = @"Show me";
    localNotif.repeatInterval = NSDayCalendarUnit;
    localNotif.soundName = @"jet.wav";
    // Specify custom data for the notification
    NSDictionary *userDict = [NSDictionary dictionaryWithObject:eventText.text
                                                         forKey:kRemindMeNotificationDataKey];
    localNotif.userInfo = userDict;

    // Schedule the notification
    [[UIApplication sharedApplication] scheduleLocalNotification:localNotif];
    [localNotif release];

    [self.tableview reloadData];
    eventText.text = @"";

    viewController = [[TimeViewController alloc] initWithNibName:@"TimeViewController" bundle:nil];
    [self presentModalViewController:viewController animated:YES];
}

#pragma mark -
#pragma mark Table view data source

- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView {
    // Return the number of sections.
    return 1;
}


- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
    // Return the number of rows in the section.
    return [[[UIApplication sharedApplication] scheduledLocalNotifications] count];
}

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
    index = indexPath.row;
    UIAlertView *alertView = [[UIAlertView alloc] initWithTitle:@"Warning!!!" 
                                                        message:@"Are you sure you want to Delete???" delegate:self
                                              cancelButtonTitle:@"Cancel"
                                              otherButtonTitles:@"Ok",nil];
    [alertView show];
    [alertView release];

}
- (void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex
{
    NSArray *notificationArray = [[UIApplication sharedApplication] scheduledLocalNotifications];
    UILocalNotification *notify = [notificationArray objectAtIndex:index];

    if(buttonIndex == 0)
    {
        // Do Nothing on Tapping Cancel...
    }
    if(buttonIndex ==1)
    {
        if(notify)
            [[UIApplication sharedApplication] cancelLocalNotification:notify];
    }
    [self.tableview reloadData];
}

// Customize the appearance of table view cells.
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {

    static NSString *CellIdentifier = @"Cell";

    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
    if (cell == nil) {
        cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier:CellIdentifier] autorelease];
    }
    // Configure the cell...

    NSArray *notificationArray = [[UIApplication sharedApplication] scheduledLocalNotifications];
    UILocalNotification *notif = [notificationArray objectAtIndex:indexPath.row];

    [cell.textLabel setText:notif.alertBody];
    [cell.detailTextLabel setText:[notif.fireDate description]];    
    return cell;
}


- (void)showReminder:(NSString *)text {
    /*
     UIAlertView *alertView = [[UIAlertView alloc] initWithTitle:@"Reminder" 
     message:@"hello" delegate:self
     cancelButtonTitle:@"OK"
     otherButtonTitles:nil];
     [alertView show];
     [self.tableview reloadData];
     [alertView release];
     */

    NSString *path = [[NSBundle mainBundle]pathForResource:@"jet" ofType:@"wav"];
    NSURL *url = [NSURL fileURLWithPath:path];

    player = [[AVAudioPlayer alloc]initWithContentsOfURL:url error:nil];
    player.numberOfLoops = -1;
    [player play];

    UIActionSheet *actionSheet = [[UIActionSheet alloc]initWithTitle:nil delegate:self cancelButtonTitle:@"Cancel" destructiveButtonTitle:nil otherButtonTitles:nil];
    [actionSheet setActionSheetStyle:UIActionSheetStyleBlackTranslucent];
    [actionSheet showInView:self.view];
//  [actionSheet showInView:[[UIApplication sharedApplication] keyWindow]];
    [actionSheet release];

}
- (void)actionSheet:(UIActionSheet *)actionSheet clickedButtonAtIndex:(NSInteger)buttonIndex
{
    [player stop];
    if(buttonIndex == 0)
    {
        NSLog(@"OK Tapped");
    }
    if(buttonIndex ==  1)
    {
        NSLog(@"Cancel Tapped");
    }
}

This Pic Shows My App View :

Answer 1

 NSDate *pickerDate = [self.pickerTime date];
// Break the date up into components
NSDateComponents *dateComponents = [calendar components:( NSYearCalendarUnit | NSMonthCalendarUnit |  NSDayCalendarUnit ) fromDate:pickerDate];
NSDateComponents *timeComponents = [calendar components:( NSHourCalendarUnit | NSMinuteCalendarUnit | NSSecondCalendarUnit) fromDate:pickerDate];
// Set up the fire time
NSDateComponents *dateComps = [[NSDateComponents alloc] init];
[dateComps setDay:[dateComponents day]];
[dateComps setMonth:[dateComponents month]];
[dateComps setYear:[dateComponents year]];
[dateComps setHour:[timeComponents hour]];
[dateComps setMinute:[timeComponents minute]];
**[dateComps setSecond:00];**
NSDate *itemDate = [calendar dateFromComponents:dateComps];
localNotification.fireDate = itemDate;

Answer 2

I think the problem here has to do with the NSDatePicker returning the seconds of the current time along with the selected time. You need to strip the seconds from the date returned by the NSDatePicker and use that for your alarm and local notification.

NSDate *selectedDate = [datePicker date]; // you don't need to alloc-init the variable first
NSCalendar *cal = [NSCalendar currentCalendar];  
NSDateComponents *dc = [cal components: (NSYearCalendarUnit | NSMonthCalendarUnit | NSDayCalendarUnit | NSHourCalendarUnit | NSMinuteCalendarUnit) fromDate:selectedDate];
selectedDate = [cal dateFromComponents:dc];

// now you have an NSDate with zero seconds for your alarm You should get much better accuracy on your notifications, but I don't think they're guaranteed to be exactly on the split second.

Answer 3

just keep in mind, the date from datepicker comes aligned with GMT. you have to convert to your own timezone by yourself. this could be the issue in your case.