scheduled timer in background in iphone sdk

UIBackgroundTaskIdentifier backgroundTask;

timer = [NSTimer scheduledTimerWithTimeInterval:1200.0

                                                        target:self

                                                      selector:@selector(runTimer)

                                                      userInfo:nil

                                                       repeats:YES];

   backgroundTask = [[UIApplication sharedApplication] beginBackgroundTaskWithExpirationHandler:^{

        NSLog(@"Background handler called. Not running background tasks anymore.");

        [[UIApplication sharedApplication] endBackgroundTask:backgroundTask];

       backgroundTask = UIBackgroundTaskInvalid;

    }];

-(void)runTimer{

}

-(void)stopTimer{

 [timer invalidate];

    timer = nil;

    if (self.backgroundTask != UIBackgroundTaskInvalid)

    {

        [[UIApplication sharedApplication] endBackgroundTask:self.backgroundTask];

        self.backgroundTask = UIBackgroundTaskInvalid;

    }

}

How to make slider menu in iphone sdk?

https://github.com/mikefrederick/MFSideMenu

get Contact email and name using ABAddressBook

-(void)getContactsList{

    CFErrorRef error = NULL;

    

    ABAddressBookRef addressBook = ABAddressBookCreateWithOptions(NULL, &error);

    

    __block BOOL accessGranted = NO;

    if (ABAddressBookRequestAccessWithCompletion != NULL) { // we're on iOS 6

        dispatch_semaphore_t sema = dispatch_semaphore_create(0);

        ABAddressBookRequestAccessWithCompletion(addressBook, ^(bool granted, CFErrorRef error) {

            accessGranted = granted;

            dispatch_semaphore_signal(sema);

        });

        dispatch_semaphore_wait(sema, DISPATCH_TIME_FOREVER);

        

    }

    else { // we're on iOS 5 or older

        accessGranted = YES;

    }

    

    if (accessGranted) {

        ABAddressBookCreateWithOptions(NULL, &error);

    if (addressBook != nil)

    {

        NSLog(@"Succesful.");

        

        NSArray *allContacts = (__bridge_transfer NSArray

                                *)ABAddressBookCopyArrayOfAllPeople(addressBook);

        NSUInteger i = 0;

        for (i = 0; i < [allContacts count]; i++)

        {

            ABRecordRef contactPerson = (__bridge ABRecordRef)allContacts[i];

            NSString *firstName = (__bridge_transfer NSString

                                   *)ABRecordCopyValue(contactPerson, kABPersonFirstNameProperty);

            NSString *lastName =  (__bridge_transfer NSString

                                   *)ABRecordCopyValue(contactPerson, kABPersonLastNameProperty);

            NSString *fullName = [NSString stringWithFormat:@"%@ %@",

                                  firstName, lastName];

            ABMutableMultiValueRef multiEmail;

            multiEmail = ABRecordCopyValue(contactPerson, kABPersonEmailProperty);

            NSString *emailAddress;

            emailAddress = (__bridge NSString *) ABMultiValueCopyValueAtIndex(multiEmail, 0);

            NSMutableDictionary *myAddressBook = [NSMutableDictionary dictionary];

            [myAddressBook setValue:emailAddress forKey:@"email"];

            [myAddressBook setValue:fullName forKey:@"fullName"];

            

            [arrContacts addObject:myAddressBook];

            

            //[arrContacts addObject:[myAddressBook valueForKey:@"email"]];

        }

        NSSortDescriptor *sort = [NSSortDescriptor sortDescriptorWithKey:@"fullName" ascending:YES];

        [arrContacts sortUsingDescriptors:[NSArray arrayWithObject:sort]];

    }          

    

    CFRelease(addressBook);

    }

}

NSMutableArray sorting in alphabatically

 NSSortDescriptor *sort = [NSSortDescriptor sortDescriptorWithKey:@"your Key" ascending:YES];

       

 [yourarray sortUsingDescriptors:[NSArray arrayWithObject:sort]];