Core-Data : Data is not been saved up - ios

Question

while following the ebook of http://timroadley.com/ i am inserting. but when i check in sqlite their is no data present in it.also i have used -com.apple.CoreData.SQLDebug to debug but no query is being shown.Source Code
Solution:- Data will only show in sqlite when i will terminate the app or the app will go in background after pressing home button.
AppDelegate.h
#import <UIKit/UIKit.h>
#import "CoreDataHelper.h"
#import <CoreData/CoreData.h>
#interface AppDelegate : UIResponder <UIApplicationDelegate>
#property (strong, nonatomic) UIWindow *window;
#property (nonatomic, strong, readonly) CoreDataHelper *coreDataHelper;
#end
AppDelegate.m
- (void)demo {
NSArray *newItemNames = [NSArray arrayWithObjects:
#"Apples", #"Milk", #"Bread", #"Cheese", #"Sausages", #"Butter", #"Orange Juice", #"Cereal", #"Coffee", #"Eggs", #"Tomatoes", #"Fish", nil];
for (NSString *newItemName in newItemNames) {
Item *newItem =
[NSEntityDescription insertNewObjectForEntityForName:#"Item" inManagedObjectContext:_coreDataHelper.context];
newItem.name = newItemName;
NSLog(#"Inserted New Managed Object for '%#'", newItem.name);
}
}
- (CoreDataHelper*)cdh {
if (!_coreDataHelper) {
_coreDataHelper = [CoreDataHelper new];
[_coreDataHelper setupCoreData];
}
return _coreDataHelper;
}
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
return YES;
}
- (void)applicationDidEnterBackground:(UIApplication *)application
{
[[self cdh] saveContext];
}
- (void)applicationDidBecomeActive:(UIApplication *)application
{
[self cdh];
[self demo];
}
- (void)applicationWillTerminate:(UIApplication *)application
{
[[self cdh] saveContext];
}
CoreDataHelper.h
#property(nonatomic,readonly) NSManagedObjectContext *context;
#property(nonatomic,readonly) NSManagedObjectModel *model;
#property(nonatomic,readonly) NSPersistentStore *store;
#property(nonatomic,readonly) NSPersistentStoreCoordinator *coordinator;
-(void)setupCoreData;
-(void)saveContext;
CoreDataHelper.m
#pragma mark - FILES
NSString *storeFilename = #"Grocery-Dude.sqlite";
#pragma mark - PATHS
- (NSString *)applicationDocumentsDirectory {
return [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask,YES) lastObject];
}
- (NSURL *)applicationStoresDirectory {
NSURL *storesDirectory =
[[NSURL fileURLWithPath:[self applicationDocumentsDirectory]]
URLByAppendingPathComponent:#"Stores"];
NSFileManager *fileManager = [NSFileManager defaultManager];
if (![fileManager fileExistsAtPath:[storesDirectory path]]) {
NSError *error = nil;
if ([fileManager createDirectoryAtURL:storesDirectory
withIntermediateDirectories:YES
attributes:nil
error:&error]) {
}
else {
NSLog(#"FAILED to create Stores directory: %#", error);}
}
return storesDirectory;
}
- (NSURL *)storeURL {
return [[self applicationStoresDirectory]
URLByAppendingPathComponent:storeFilename];
}
#pragma mark - SETUP
- (id)init {
self = [super init];
if (!self) {return nil;}
_model = [NSManagedObjectModel mergedModelFromBundles:nil];
_coordinator = [[NSPersistentStoreCoordinator alloc]
initWithManagedObjectModel:_model];
_context = [[NSManagedObjectContext alloc]
initWithConcurrencyType:NSMainQueueConcurrencyType];
[_context setPersistentStoreCoordinator:_coordinator];
return self;
}
- (void)loadStore {
if (_store) {return;} // Don’t load store if it's already loaded
NSDictionary *options =
#{NSSQLitePragmasOption: #{#"journal_mode": #"DELETE"}};
NSError *error = nil;
_store = [_coordinator addPersistentStoreWithType:NSSQLiteStoreType
configuration:nil
URL:[self storeURL]
options:options error:&error];
if (!_store) {NSLog(#"Failed to add store. Error: %#", error);abort();}
else {NSLog(#"Successfully added store: %#", _store);}
}
- (void)setupCoreData {
[self loadStore];
}
#pragma mark - SAVING
- (void)saveContext {
if ([_context hasChanges]) {
NSError *error = nil;
if ([_context save:&error]) {
NSLog(#"_context SAVED changes to persistent store");
} else {
NSLog(#"Failed to save _context: %#", error);
}
} else {
NSLog(#"SKIPPED _context save, there are no changes!");
}
}

Answer 1

Try saving item in the loop itself like
NSArray *newItemNames = [NSArray arrayWithObjects:
#"Apples", #"Milk", #"Bread", #"Cheese", #"Sausages", #"Butter", #"Orange Juice", #"Cereal", #"Coffee", #"Eggs", #"Tomatoes", #"Fish", nil];
for (NSString *newItemName in newItemNames) {
Item *newItem =
[NSEntityDescription insertNewObjectForEntityForName:#"Item" inManagedObjectContext:_coreDataHelper.context];
newItem.name = newItemName;
NSLog(#"Inserted New Managed Object for '%#'", newItem.name);
[[self cdh] saveContext];
}