AppDelegate.m

// Example app delegate for RestKit + Core Data config

// Import Core Data and RestKit, in that order
#import <CoreData/CoreData.h>
#import <RestKit/RestKit.h>

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
    // Configure the global object manager with your API's base url
    NSURL *baseURL = [NSURL URLWithString:@"https://your-api.example.com"];
    RKObjectManager *objectManager = [RKObjectManager managerWithBaseURL:baseURL];
    
    // Configure Core Data
    NSManagedObjectModel *managedObjectModel = [NSManagedObjectModel mergedModelFromBundles:nil];
    RKManagedObjectStore *managedObjectStore = [[RKManagedObjectStore alloc] initWithManagedObjectModel:managedObjectModel];
    objectManager.managedObjectStore = managedObjectStore;
    [managedObjectStore createPersistentStoreCoordinator];
    
    NSString *storePath = [RKApplicationDataDirectory() stringByAppendingPathComponent:@"YourDB.sqlite"];

    NSError *error;
    NSPersistentStore *persistentStore = [managedObjectStore addSQLitePersistentStoreAtPath:storePath
                                                                     fromSeedDatabaseAtPath:nil
                                                                          withConfiguration:nil
                                                                                    options:nil
                                                                                      error:&error];

    NSAssert(persistentStore, @"Failed to add persistent store with error: %@", error);
    
    // Configure an in memory object cache
    [managedObjectStore createManagedObjectContexts];
    managedObjectStore.managedObjectCache =
      [[RKInMemoryManagedObjectCache alloc] initWithManagedObjectContext:managedObjectStore.persistentStoreManagedObjectContext];
    
    // Turn on logging
    RKLogConfigureByName("RestKit/Network", RKLogLevelTrace);
    RKLogConfigureByName("RestKit/ObjectMapping", RKLogLevelTrace);
    
    // Configure RestKit mappings

    return YES;
}

- (void)applicationWillResignActive:(UIApplication *)application;
{
    NSError* error = nil;
    if (![[RKObjectManager sharedManager].managedObjectStore.mainQueueManagedObjectContext saveToPersistentStore:&error])
    {
      NSLog(@"Failed to persist Core Data with error: %@", error);
    }
}