Navigation concepts

//Change the Title Image in  navigation bar:

self.navigationItem.titleView = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"flower.png"]];

//Checking version 6 or 7 for changing background color of navigation bar

 NSString *version = [[UIDevice currentDevice] systemVersion];

    if ([version floatValue] < 7) { 

        self.navigationController.navigationBar.barTintColor=[UIColor blackColor];

    } else {

        self.navigationController.navigationBar.tintColor=[UIColor blackColor];

    }

//Hide the back button

    [self.navigationItem setHidesBackButton:YES animated:YES];

//Create custom Back button:

UIButton* customBackButton = [UIButton buttonWithType:101];

    [customBackButton setTitle:@"Back" forState:UIControlStateNormal];

    [customBackButton addTarget:self action:@selector(done:) forControlEvents:UIControlEventTouchUpInside];

    UIBarButtonItem    *myBackButton = [[UIBarButtonItem alloc] initWithCustomView:customBackButton];

    self.navigationItem.backBarButtonItem=myBackButton;

//Create Right bar button: (more than one button)

UIBarButtonItem* allFriends = [[UIBarButtonItem alloc]initWithImage:[UIImage imageNamed:@"frnds.png"] style:UIBarButtonItemStyleBordered target:self action:@selector(allfrnd:)];

    

    UIBarButtonItem* setting = [[UIBarButtonItem alloc]initWithImage:[UIImage imageNamed:@"options.png"] style:UIBarButtonItemStyleBordered target:self action:@selector(setting)];

    self.navigationItem.rightBarButtonItems=@[setting,allFriends];

//Programmatically pushing a root view controller it embedded with navigation controller

ViewController *user=[self.storyboard instantiateViewControllerWithIdentifier:@"user"];

                UINavigationController *navigationController = [[UINavigationController alloc]initWithRootViewController:user];

                [self.navigationController presentViewController:navigationController animated:YES completion:nil];