Navigation Controller

                    Navigation Controller 

Drag View and change it to navigation view controller.
i ) create two more viewcontroller.h,viewcontroller.m an viewcontroller.xib 's and map each other correctly then Insert headings for Views, Labels and buttons.
ii) There is no need to change Main.m,  AppDelgate.h.

AppDelegate.m

#import "AppDelegate.h"

#import "ViewController.h"

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
    
    [[NSNotificationCenter defaultCenter]addObserver:self selector:@selector(testingAppLevelNotificaions) name:@"test" object:nil];
    
    self.window = [[[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]] autorelease];
    // Override point for customization after application launch.
    self.viewController = [[[ViewController alloc] initWithNibName:@"ViewController" bundle:nil] autorelease];
    
     [[NSNotificationCenter defaultCenter]addObserver:self.viewController selector:@selector(test2) name:@"test" object:nil];
    UINavigationController *navController = [[UINavigationController alloc]initWithRootViewController:self.viewController];
    self.window.rootViewController = navController;
    [self.window makeKeyAndVisible];
    return YES;
}

ViewController.h

#import <UIKit/UIKit.h>
#import "SecondViewController.h"

@interface ViewController : UIViewController{
    
}
-(IBAction)goToSecond;
-(void)test2;
@end

ViewController.m


#import "ViewController.h"

@implementation ViewController

-(IBAction)goToSecond{    
    SecondViewController *second = [[SecondViewController alloc]initWithNibName:@"SecondViewController" bundle:nil];
    [self.navigationController pushViewController:second animated:YES];
}

-(void)test2{

    NSLog(@"test2 method called");
}

- (void)didReceiveMemoryWarning
{
    [super didReceiveMemoryWarning];
    // Release any cached data, images, etc that aren't in use.
}

#pragma mark - View lifecycle

- (void)viewDidLoad
{
    [super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
    self.title = @"Root";
}


@end


SecondViewController.h

#import <UIKit/UIKit.h>

@interface SecondViewController : UIViewController

-(IBAction)goToThird;
@end

SecondViewController.m



#import "SecondViewController.h"
#import "ThirdViewController.h"

@implementation SecondViewController

-(IBAction)goToThird{
    
    ThirdViewController *third = [[ThirdViewController alloc]initWithNibName:@"ThirdViewController" bundle:nil];
    [self.navigationController pushViewController:third animated:YES];
}

- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
    self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
    if (self) {
        // Custom initialization
    }
    return self;
}

#pragma mark - View lifecycle

- (void)viewDidLoad
{
    [super viewDidLoad];
    // Do any additional setup after loading the view from its nib.
    self.title = @"Second";
    [[NSNotificationCenter defaultCenter]addObserver:self selector:@selector(test3) name:@"test" object:nil];
}
-(void)test3{
    
    NSLog(@"test3 called");
}


@end


ThirdViewController.h

#import <UIKit/UIKit.h>

@interface ThirdViewController : UIViewController{
    IBOutlet UILabel *lbl;
}

-(IBAction)postNotification;

@end

ThirdViewController.m

#import "ThirdViewController.h"

@implementation ThirdViewController

-(IBAction)postNotification{
    lbl.text=@"Third view controller";
    [[NSNotificationCenter defaultCenter]postNotificationName:@"test" object:nil];
}

- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
    self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
    if (self) {
        // Custom initialization
    }
    return self;
}

@end

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