AppDelegate For CoreData Application

AppDelegate.m

/* Appdelegate for coredata */

#import <Foundation/Foundation.h>
#import <CoreData/CoreData.h>

@interface AppDelegate : NSObject <UIApplicationDelegate>
{
	UIWindow * _window;
	NSManagedObjectModel * _managedObjectModel;
	NSPersistentStoreCoordinator * _persistentStoreCoordinator;
	NSManagedObjectContext * _managedObjectContext
}
@property (assign, nonatomic) IBOutlet UIWindow *window;
@property (retain, nonatomic) NSManagedObjectModel *managedObjectModel;
@property (retain, nonatomic) NSPersistentStoreCoordinator *persistentStoreCoordinator;
@property (retain, nonatomic) NSManagedObjectContext *managedObjectContext;
@end

@implementation AppDelegate
@synthesize window=_window, managedObjectContext=_managedObjectContext, managedObjectModel=_managedObjectModel, persistentStoreCoordinator=_persistentStoreCoordinator;

#pragma mark - dealloc

- (void)dealloc
{
	_window = nil;
	[_managedObjectModel release];
	[_persistentStoreCoordinator release];
	[_managedObjectContext release];
	[super dealloc];
}

#pragma mark - CoreData Preparation

- (NSManagedObjectModel *)managedObjectModel
{
	if(!_managedObjectModel) {
		_managedObjectModel = [[NSManagedObjectModel mergedModelWithBundle:nil] retain];
	}
	return _managedObjectModel;
}

- (NSPersistentStoreCoordinator *)persistentStoreCoordinator
{
	if(!_persistentStoreCoordinator) {
		_persistentStoreCoordinator = [[NSPersistentStoreCoordinator alloc] initWithManagedObjectModel:self.managedObjectModel];
		NSURL *documentPathURL = [[[NSFileManager defaultManager] URLsForDirectory:NSDocumentDirectory inDomains:NSUserDomain] lastObject];
		NSURL *storeURL = [documentPathURL URLByAppendingPathComponent:@"store.sqlite"];
		NSError *error = NULL;
		if(![_persistentStoreCoordinator addPersistentStoreWithType:NSSQLStoreType configuration:nil URL:storeURL options:nil error:&error]) {
			NSLog(@"Can't create store file");
			abort();
		}
	}
	return _persistentStoreCoordinator;
}

- (NSManagedObjectContext *)managedObjectContext
{
	if(!_managedObjectContext) {
		_managedObjectContext = [[NSManagedObjectContext alloc] init];
		[_managedObjectContext setPersistentStoreCoordinator:self.persistentStoreCoordinator];
	}
	return _managedObjectContext;
}

#pragma mark - Appliaction Delegate 

- (BOOL) applicationDidFinishLaunchingWithOptions:(NSDictionary *)options {
	/* init app */
	return YES;
}

/* in iOS use this AppDelegate method

- (BOOL) application:(UIApplication *) didFinishLaunchingWithOptions:(NSDictionary *)options
{
	return YES;
} 
*/