EEChecklistManager.m

@implementation EEChecklistManager

#pragma mark - Singleton
+ (EEChecklistManager *)sharedMMChecklistManager
{
    static EEChecklistManager *sharedMMChecklistManager = nil;

    static dispatch_once_t onceToken;
    dispatch_once(&onceToken, ^{

        sharedMMChecklistManager = [[self alloc]init];
    });
    return sharedMMChecklistManager;
}

#pragma mark - Instance methods
- (void)saveChecklist
{
    if (!self.swipedCellIdNumbers) {
        self.swipedCellIdNumbers = [[NSMutableArray alloc]init];
    }

    for (NSNumber *swipedCellIdNumber in self.swipedCellIdNumbers) {

    EEAppDelegate *appDelegate =
    [[UIApplication sharedApplication] delegate];

    NSManagedObjectContext *context =
    [appDelegate managedObjectContext];
    NSManagedObject *cellIdNumber;

    cellIdNumber = [NSEntityDescription
                  insertNewObjectForEntityForName:@"Cell_Id_Numbers"
                  inManagedObjectContext:context];

    [cellIdNumber setValue:swipedCellIdNumber forKey:@"id_number"];

    NSError *error;
    [context save:&error];

    }
}

- (void)fetchSavedChecklist
{
    if (!self.swipedCellIdNumbers) {
        self.swipedCellIdNumbers = [[NSMutableArray alloc]init];
    }

   EEAppDelegate *appDelegate = [[UIApplication sharedApplication] delegate];

    NSManagedObjectContext *context =
    [appDelegate managedObjectContext];

    NSEntityDescription *entityDesc =
    [NSEntityDescription entityForName:@"Cell_Id_Numbers"
                inManagedObjectContext:context];

    NSFetchRequest *request = [[NSFetchRequest alloc] init];
    [request setEntity:entityDesc];

    NSError *error;
    NSArray *objects = [context executeFetchRequest:request
                                              error:&error];

    if ([objects count] == 0) {
        NSLog(@"No swiped cells persisted.");

    } else {

        //Lop through returned objects, create NSNumbers,
        //and add NSNumbers to swipedCellRows
        for (id object in objects) {

            NSManagedObject *managedObject = object;
            NSNumber *finalCellIdNumber = [managedObject valueForKey:@"id_number"];
            [self.swipedCellIdNumbers addObject:finalCellIdNumber];

        }


    }
}

@end