Create RKTwitterCoreData project. It's a clone of the RKTwitter example, but using core data.

Examples/RKTwitterCoreData/Classes/RKTStatus.h

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+//
+//  RKTStatus.h
+//  RKTwitter
+//
+//  Created by Blake Watters on 9/5/10.
+//  Copyright 2010 Two Toasters. All rights reserved.
+//
+
+#import <RestKit/RestKit.h>
+#import "RKTUser.h"
+#import <RestKit/CoreData/CoreData.h>
+
+@interface RKTStatus : RKManagedObject {
+}
+
+/**
+ * The unique ID of this Status
+ */
+@property (nonatomic, retain) NSNumber* statusID;
+
+/**
+ * Timestamp the Status was sent
+ */
+@property (nonatomic, retain) NSDate* createdAt;
+
+/**
+ * Text of the Status
+ */
+@property (nonatomic, retain) NSString* text;
+
+/**
+ * String version of the URL associated with the Status
+ */
+@property (nonatomic, retain) NSString* urlString;
+
+/**
+ * The screen name of the User this Status was in response to
+ */
+@property (nonatomic, retain) NSString* inReplyToScreenName;
+
+/**
+ * Is this status a favorite?
+ */
+@property (nonatomic, assign) BOOL isFavorited;
+
+/**
+ * The User who posted this status
+ */
+@property (nonatomic, retain) RKTUser* user;
+
+@end

Examples/RKTwitterCoreData/Classes/RKTStatus.m

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+//
+//  RKTStatus.m
+//  RKTwitter
+//
+//  Created by Blake Watters on 9/5/10.
+//  Copyright 2010 Two Toasters. All rights reserved.
+//
+
+#import "RKTStatus.h"
+
+@implementation RKTStatus
+
+@dynamic statusID;
+@dynamic createdAt;
+@dynamic text;
+@dynamic urlString;
+@dynamic inReplyToScreenName;
+@dynamic isFavorited;
+@dynamic user;
+
+#pragma mark RKObjectMappable methods
+
++ (NSDictionary*)elementToPropertyMappings {
+	return [NSDictionary dictionaryWithKeysAndObjects:
+			@"id", @"statusID",
+			@"created_at", @"createdAt",
+			@"text", @"text",
+			@"url", @"urlString",
+			@"in_reply_to_screen_name", @"inReplyToScreenName",
+			@"favorited", @"isFavorited",
+			nil];
+}
+
++ (NSDictionary*)elementToRelationshipMappings {
+	return [NSDictionary dictionaryWithKeysAndObjects:
+			@"user", @"user",
+			nil];
+}
+
++ (NSString*)primaryKey {
+	return @"statusID";
+}
+
+- (NSString*)description {
+	return [NSString stringWithFormat:@"%@ (ID: %@)", self.text, self.statusID];
+}
+
+@end

Examples/RKTwitterCoreData/Classes/RKTUser.h

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+//
+//  RKTUser.h
+//  RKTwitter
+//
+//  Created by Blake Watters on 9/5/10.
+//  Copyright 2010 Two Toasters. All rights reserved.
+//
+
+#import <RestKit/RestKit.h>
+#import <RestKit/CoreData/CoreData.h>
+
+@interface RKTUser : RKManagedObject {
+}
+
+@property (nonatomic, retain) NSNumber* userID;
+@property (nonatomic, retain) NSString* name;
+@property (nonatomic, retain) NSString* screenName;
+
+@end

Examples/RKTwitterCoreData/Classes/RKTUser.m

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+//
+//  RKTUser.m
+//  RKTwitter
+//
+//  Created by Blake Watters on 9/5/10.
+//  Copyright 2010 Two Toasters. All rights reserved.
+//
+
+#import "RKTUser.h"
+
+@implementation RKTUser
+
+@dynamic userID;
+@dynamic name;
+@dynamic screenName;
+
+#pragma mark RKObjectMappable methods
+
++ (NSDictionary*)elementToPropertyMappings {
+	return [NSDictionary dictionaryWithKeysAndObjects:
+			@"id", @"userID",
+			@"screen_name", @"screenName",
+			@"name", @"name",
+			nil];
+}
+
++ (NSString*)primaryKey {
+	return @"userID";
+}
+
+@end

Examples/RKTwitterCoreData/Classes/RKTwitterAppDelegate.h

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+//
+//  RKTwitterAppDelegate.h
+//  RKTwitter
+//
+//  Created by Blake Watters on 9/5/10.
+//  Copyright Two Toasters 2010. All rights reserved.
+//
+
+#import <UIKit/UIKit.h>
+
+
+@interface RKTwitterAppDelegate : NSObject <UIApplicationDelegate> {
+}
+
+@end
+

Examples/RKTwitterCoreData/Classes/RKTwitterAppDelegate.m

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+//
+//  RKTwitterAppDelegate.m
+//  RKTwitter
+//
+//  Created by Blake Watters on 9/5/10.
+//  Copyright Two Toasters 2010. All rights reserved.
+//
+
+#import <RestKit/RestKit.h>
+#import "RKTwitterAppDelegate.h"
+#import "RKTwitterViewController.h"
+#import "RKTStatus.h"
+#import "RKTUser.h"
+
+@implementation RKTwitterAppDelegate
+
+#pragma mark -
+#pragma mark Application lifecycle
+
+- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {    
+    
+    // Initialize RestKit
+	RKObjectManager* objectManager = [RKObjectManager objectManagerWithBaseURL:@"http://twitter.com"];
+	RKObjectMapper* mapper = objectManager.mapper;
+	
+	// Initialize object store
+	objectManager.objectStore = [[[RKManagedObjectStore alloc] initWithStoreFilename:@"RKTwitterData.sqlite"] autorelease];
+	
+	// Add our element to object mappings
+	[mapper registerClass:[RKTUser class] forElementNamed:@"user"];
+	[mapper registerClass:[RKTStatus class] forElementNamed:@"status"];
+
+    // Create Window and View Controllers
+	RKTwitterViewController* viewController = [[[RKTwitterViewController alloc] initWithNibName:nil bundle:nil] autorelease];
+	UINavigationController* controller = [[UINavigationController alloc] initWithRootViewController:viewController];
+	UIWindow* window = [[UIWindow alloc] initWithFrame:CGRectMake(0, 0, 320, 480)];
+    [window addSubview:controller.view];
+    [window makeKeyAndVisible];
+
+    return YES;
+}
+
+- (void)dealloc {
+    [super dealloc];
+}
+
+
+@end

Examples/RKTwitterCoreData/Classes/RKTwitterViewController.h

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+//
+//  RKTwitterViewController.h
+//  RKTwitter
+//
+//  Created by Blake Watters on 9/5/10.
+//  Copyright Two Toasters 2010. All rights reserved.
+//
+
+#import <UIKit/UIKit.h>
+#import <RestKit/RestKit.h>
+
+@interface RKTwitterViewController : UIViewController <UITableViewDelegate, UITableViewDataSource, RKObjectLoaderDelegate> {
+	UITableView* _tableView;
+	NSArray* _statuses;
+}
+
+@end

Examples/RKTwitterCoreData/Classes/RKTwitterViewController.m

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+//
+//  RKTwitterViewController.m
+//  RKTwitter
+//
+//  Created by Blake Watters on 9/5/10.
+//  Copyright Two Toasters 2010. All rights reserved.
+//
+
+#import "RKTwitterViewController.h"
+#import "RKTStatus.h"
+
+@implementation RKTwitterViewController
+
+- (void)loadView {
+    [super loadView];
+	
+	// Setup View and Table View
+	
+	self.title = @"Two Toasters Tweets";
+	[[UIApplication sharedApplication] setStatusBarStyle:UIStatusBarStyleBlackTranslucent];
+	[self.navigationController.navigationBar setTintColor:[UIColor blackColor]];
+	
+	UIImageView* imageView = [[[UIImageView alloc] initWithImage:[UIImage imageNamed:@"BG.png"]] autorelease];
+	imageView.frame = CGRectOffset(imageView.frame, 0, -64);
+	
+	[self.view insertSubview:imageView atIndex:0];
+	
+	_tableView = [[UITableView alloc] initWithFrame:CGRectMake(0, 0, 320, 480-64) style:UITableViewStylePlain];
+	_tableView.dataSource = self;
+	_tableView.delegate = self;
+	[self.view addSubview:_tableView];
+	
+	_tableView.backgroundColor = [UIColor clearColor];
+	_tableView.separatorStyle = UITableViewCellSeparatorStyleNone;
+	
+	UIBarButtonItem* reloadItem = [[[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemRefresh target:self action:@selector(reloadButtonWasPressed:)] autorelease];
+	[self.navigationItem setRightBarButtonItem:reloadItem];
+	
+	// Load statuses from core data
+	[self loadObjectsFromDataStore];
+}
+
+
+- (void)dealloc {
+	[_tableView release];
+	[_statuses release];
+    [super dealloc];
+}
+
+- (void)loadObjectsFromDataStore {
+	[_statuses release];
+	_statuses = [[RKTStatus allObjects] retain];
+	NSFetchRequest* request = [RKTStatus request];
+	NSSortDescriptor* descriptor = [NSSortDescriptor sortDescriptorWithKey:@"statusID" ascending:NO];
+	[request setSortDescriptors:[NSArray arrayWithObject:descriptor]];
+	[[RKTStatus objectsWithRequest:request] retain];
+}
+
+- (void)reloadButtonWasPressed:(id)sender {
+	// Load the object model via RestKit
+	// Retain the object loader that is returned so that it is not dealloc'd after the request is sent.
+	RKObjectManager* objectManager = [RKObjectManager globalManager];
+	[[objectManager loadObjectsAtResourcePath:@"/status/user_timeline/twotoasters.json" objectClass:[RKTStatus class] delegate:self] retain];
+}
+
+#pragma mark RKObjectLoaderDelegate methods
+
+- (void)objectLoader:(RKObjectLoader*)objectLoader didLoadObjects:(NSArray*)objects {
+	[[NSUserDefaults standardUserDefaults] setObject:[NSDate date] forKey:@"LastUpdatedAt"];
+	[[NSUserDefaults standardUserDefaults] synchronize];
+	NSLog(@"Loaded statuses: %@", objects);
+	[self loadObjectsFromDataStore];
+	[_tableView reloadData];
+	[objectLoader release];
+}
+
+- (void)objectLoader:(RKObjectLoader*)objectLoader didFailWithError:(NSError*)error {
+	UIAlertView* alert = [[[UIAlertView alloc] initWithTitle:@"Error" message:[error localizedDescription] delegate:nil cancelButtonTitle:@"OK" otherButtonTitles:nil] autorelease];
+	[alert show];
+	NSLog(@"Hit error: %@", error);
+	[objectLoader release];
+}
+
+#pragma mark UITableViewDelegate methods
+
+- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath {
+	CGSize size = [[[_statuses objectAtIndex:indexPath.row] text] sizeWithFont:[UIFont systemFontOfSize:14] constrainedToSize:CGSizeMake(300, 9000)];
+	return size.height + 10;
+}
+
+#pragma mark UITableViewDataSource methods
+
+- (NSInteger)tableView:(UITableView *)table numberOfRowsInSection:(NSInteger)section {
+	return [_statuses count];
+}
+
+- (NSString *)tableView:(UITableView *)tableView titleForHeaderInSection:(NSInteger)section {
+	NSDate* lastUpdatedAt = [[NSUserDefaults standardUserDefaults] objectForKey:@"LastUpdatedAt"];
+	NSString* dateString = [NSDateFormatter localizedStringFromDate:lastUpdatedAt dateStyle:NSDateFormatterShortStyle timeStyle:NSDateFormatterMediumStyle];
+	if (nil == dateString) {
+		dateString = @"Never";
+	}
+	return [NSString stringWithFormat:@"Last Load: %@", dateString];
+}
+
+- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
+	NSString* reuseIdentifier = @"Tweet Cell";
+	UITableViewCell* cell = [tableView dequeueReusableCellWithIdentifier:reuseIdentifier];
+	if (nil == cell) {
+		cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:reuseIdentifier] autorelease];
+		cell.textLabel.font = [UIFont systemFontOfSize:14];
+		cell.textLabel.numberOfLines = 0;
+		cell.textLabel.backgroundColor = [UIColor clearColor];
+		cell.contentView.backgroundColor = [UIColor colorWithPatternImage:[UIImage imageNamed:@"listbg.png"]];
+	}
+	cell.textLabel.text = [[_statuses objectAtIndex:indexPath.row] text];
+	return cell;
+}
+
+@end