Possible d'intégrer un ancien projet xcode dans un nouveau ?

#import <UIKit/UIKit.h>
#import <CoreData/CoreData.h>
#import "DataListViewController.h"
#import "DetailListViewController.h"

@class DataListViewController;

@interface TableViewAppDelegate : NSObject <UIApplicationDelegate> {
    
    UIWindow *window;
	DataListViewController *dataListViewController;
	DetailListViewController *detailListViewController;
	UINavigationController *navController;
    
}

@property (nonatomic, retain) IBOutlet UIWindow *window;
@property (nonatomic, retain) DataListViewController *dataListViewController;
@property (nonatomic, retain) DetailListViewController *detailListViewController;

@end

#import "TableViewAppDelegate.h"


@implementation TableViewAppDelegate

@synthesize window;
@synthesize dataListViewController;
@synthesize detailListViewController;


#pragma mark -
#pragma mark Application lifecycle

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {    
    
    // Override point for customization after application launch.
    dataListViewController = [[DataListViewController alloc] initWithStyle:UITableViewStylePlain];
	navController = [[UINavigationController alloc] initWithRootViewController:dataListViewController];
	[window addSubview:dataListViewController.view];
	[window addSubview:navController.view];
    [self.window makeKeyAndVisible];
    
    return YES;
}


- (void)viewDidLoad {
	
}


- (void)dealloc {
    [navController release];
    [dataListViewController release];
    [window release];
    [super dealloc];
}


@end

#import <UIKit/UIKit.h>

@class ModalViewExampleViewController;

@interface ModalViewExampleAppDelegate : NSObject <UIApplicationDelegate> {
    UIWindow *window;
    ModalViewExampleViewController *viewController;
}

@property (nonatomic, retain) IBOutlet UIWindow *window;
@property (nonatomic, retain) IBOutlet ModalViewExampleViewController *viewController;

@end

#import "ModalViewExampleAppDelegate.h"
#import "ModalViewExampleViewController.h"

@implementation ModalViewExampleAppDelegate

@synthesize window;
@synthesize viewController;


- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {    
    
    // Override point for customization after application launch.
	
	// Set the view controller as the window's root view controller and display.
    self.window.rootViewController = self.viewController;
    [self.window makeKeyAndVisible];

    return YES;
}

- (void)dealloc {
    [viewController release];
    [window release];
    [super dealloc];
}


@end