#pragma mark - Core Data stack@synthesize managedObjectContext = _managedObjectContext;
@synthesize managedObjectModel = _managedObjectModel;
@synthesize persistentStoreCoordinator = _persistentStoreCoordinator;- (NSURL *)applicationDocumentsDirectory {// The directory the application uses to store the Core Data store file. This code uses a directory named "itheima.CoreData___" in the application's documents directory.return [[[NSFileManager defaultManager] URLsForDirectory:NSDocumentDirectory inDomains:NSUserDomainMask] lastObject];
}- (NSManagedObjectModel *)managedObjectModel {// The managed object model for the application. It is a fatal error for the application not to be able to find and load its model.if (_managedObjectModel != nil) {return _managedObjectModel;}NSURL *modelURL = [[NSBundle mainBundle] URLForResource:@"CoreData___" withExtension:@"momd"];_managedObjectModel = [[NSManagedObjectModel alloc] initWithContentsOfURL:modelURL];return _managedObjectModel;
}- (NSPersistentStoreCoordinator *)persistentStoreCoordinator {// The persistent store coordinator for the application. This implementation creates and returns a coordinator, having added the store for the application to it.if (_persistentStoreCoordinator != nil) {return _persistentStoreCoordinator;}// Create the coordinator and store_persistentStoreCoordinator = [[NSPersistentStoreCoordinator alloc] initWithManagedObjectModel:[self managedObjectModel]];NSURL *storeURL = [[self applicationDocumentsDirectory] URLByAppendingPathComponent:@"CoreData___.sqlite"];NSError *error = nil;NSString *failureReason = @"There was an error creating or loading the application's saved data.";if (![_persistentStoreCoordinator addPersistentStoreWithType:NSSQLiteStoreType configuration:nil URL:storeURL options:nil error:&error]) {// Report any error we got.NSMutableDictionary *dict = [NSMutableDictionary dictionary];dict[NSLocalizedDescriptionKey] = @"Failed to initialize the application's saved data";dict[NSLocalizedFailureReasonErrorKey] = failureReason;dict[NSUnderlyingErrorKey] = error;error = [NSError errorWithDomain:@"YOUR_ERROR_DOMAIN" code:9999 userInfo:dict];// Replace this with code to handle the error appropriately.// abort() causes the application to generate a crash log and terminate. You should not use this function in a shipping application, although it may be useful during development.NSLog(@"Unresolved error %@, %@", error, [error userInfo]);abort();}return _persistentStoreCoordinator;
}- (NSManagedObjectContext *)managedObjectContext {// Returns the managed object context for the application (which is already bound to the persistent store coordinator for the application.)if (_managedObjectContext != nil) {return _managedObjectContext;}NSPersistentStoreCoordinator *coordinator = [self persistentStoreCoordinator];if (!coordinator) {returnnil;}_managedObjectContext = [[NSManagedObjectContext alloc] initWithConcurrencyType:NSMainQueueConcurrencyType];[_managedObjectContext setPersistentStoreCoordinator:coordinator];return _managedObjectContext;
}#pragma mark - Core Data Saving support- (void)saveContext {NSManagedObjectContext *managedObjectContext = self.managedObjectContext;if (managedObjectContext != nil) {NSError *error = nil;if ([managedObjectContext hasChanges] && ![managedObjectContext save:&error]) {// Replace this implementation with code to handle the error appropriately.// abort() causes the application to generate a crash log and terminate. You should not use this function in a shipping application, although it may be useful during development.NSLog(@"Unresolved error %@, %@", error, [error userInfo]);abort();}}
}
