Core data persistent stack

gistfile1.m

// Header file

@interface PCPersistentStack : NSObject

@property (readonly) NSManagedObjectContext *managedObjectContext;

- (instancetype)initWithStoreURL:(NSURL*)storeURL modelURL:(NSURL*)modelURL;
- (void)saveContext;

@end

// Implementation file

@import CoreData;

@implementation PCPersistentStack

- (instancetype)initWithStoreURL:(NSURL*)storeURL modelURL:(NSURL*)modelURL {
    if (!(self = [super init])) {
        return nil;
    }
    
	_managedObjectContext = [[NSManagedObjectContext alloc] initWithConcurrencyType:NSMainQueueConcurrencyType];
	NSManagedObjectModel *managedObjectModel = [[NSManagedObjectModel alloc] initWithContentsOfURL:modelURL];
    self.managedObjectContext.persistentStoreCoordinator = [[NSPersistentStoreCoordinator alloc] initWithManagedObjectModel:managedObjectModel];
	
	NSError* error;
    [self.managedObjectContext.persistentStoreCoordinator addPersistentStoreWithType:NSSQLiteStoreType configuration:nil URL:storeURL options:nil error:&error];
    if (error) {
        NSLog(@"error: %@", error);
    }
	
    return self;
}

- (void)saveContext {
	NSError* error;
	[self.managedObjectContext save:&error];
	if (error) {
        NSLog(@"error: %@", error);
    }
}

@end