add new file in that select the cococatouch and select the Objective -C class and then go to the next click.
you show the below screen
at the bottom must select the with xib for user Interface.and next
AppDelegate.h:
@class ViewController;
@interface AppDelegate : UIResponder <UIApplicationDelegate>
{
ViewController *viewObj;
UINavigationController *navObj;
}
@property (strong, nonatomic) UIWindow *window;
@property (strong, nonatomic) ViewController *viewObj;
@property (strong, nonatomic) UINavigationController *navObj;
AppDelegate.m:
@synthesize viewObj,window,navObj;
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
window = [[UIWindow alloc] initWithFrame:[UIScreen mainScreen].bounds];
viewObj = [[ViewController alloc] initWithNibName:@"ViewController" bundle:nil];
navObj = [[UINavigationController alloc] initWithRootViewController:viewObj];
window.rootViewController=navObj;
[window makeKeyAndVisible];
return YES;
}