Open and initialize core data database that has been delivered with the app bundle. Note that text surrounded by <> will need to be replaced with local names for your app.

OpenNSManagedDoc

                                // Copy <Database> to runtime location in Documents directory and open data store.
- (void) init<Database>
{
                                /*  Get URL of Documents directory. It returns all matching 
                                    directories in the domain but should only see one and it 
                                    is in location 0 of the array (or "lastObject")
                                 */
    
    NSArray *tempURLs = [[NSFileManager defaultManager] URLsForDirectory: NSDocumentDirectory inDomains:NSUserDomainMask];
    NSURL *documentsURL = [tempURLs lastObject];

                                // Change working directory to Documents and create "<Database>/StoreContent" directory in run-time environment.
    
    BOOL success = [[NSFileManager defaultManager] changeCurrentDirectoryPath:[documentsURL path]];
    NSLog(@"Change to Documents directory was successful? %d", success);
    
    success = [[NSFileManager defaultManager] createDirectoryAtPath:@"./<Database>/StoreContent" withIntermediateDirectories:YES attributes:nil error:nil];
    NSLog(@"Create new directory was successful? %d", success);
    
                                /* Copy persistentStore into new directory from bundle. First build URL for file to be copied from bundle then build URL for file destination in Documents then copy file.
                                 */
    NSURL *copyFromURL = [[NSBundle mainBundle] resourceURL];
    copyFromURL = [copyFromURL URLByAppendingPathComponent:@"<DatabaseBundleFilename>"];
    NSURL *<DatabaseDestinationURL> = [documentsURL URLByAppendingPathComponent:@"<DatabaseSandboxFilename"];
    NSURL *copyToURL = [<DatabaseDestinationURL> URLByAppendingPathComponent:@"StoreContent/persistentStore"];
    
    success = [[NSFileManager defaultManager] copyItemAtURL:copyFromURL toURL:copyToURL error:nil];
    NSLog(@"File copy was successful? %d", success);
    
                                // Allocate UIManagedDoc object pointer to <Database> and open file if exists.
    
    self.<DatabaseUIManagedDoc> = [[UIManagedDocument alloc] initWithFileURL:<DatabaseDestinationURL>];
    
    if ([[NSFileManager defaultManager] fileExistsAtPath:[<DatabaseDestinationURL> path]])
    {
        [self.<DatabaseUIManagedDoc> openWithCompletionHandler:^(BOOL success)
         {
                                // File should have been copied from main bundle. If not there - PROBLEM!
             if (!success)
             {
                 NSLog(@"Couldn't open file at %@", <DatabaseDestinationURL>);
             }
             else
             {
                 NSLog(@"file open success=%d", success);
             }
             [self <AppDefinedAction>];
             
         }];
    } else NSLog(@"<Database> file not found");
    
                                // Set <Database> context and save in App Delegate for
                                // use by View Controllers.
    self.<DatabaseContext> = self.<DatabaseUIManagedDoc>.managedObjectContext;
    self.myAppDelegate = [[UIApplication sharedApplication] delegate];
    [self.myAppDelegate setProdRegistryContext: self.<DatabaseContext>];
}