Hello Guys
In this blog, I have declared HomeViewController class and explained how to implement methods in class.

HOMEVIEWCONROLLER.H

#import <UIKit/UIKit.h>
@interface HomeViewController : UIViewController
// With the help of interface you can declare a class of UIViewController.HomeViewController is the derived class of UIViewController
{
NSString *name;
// You can declare IBOutlets as well as Global objects here.  
}

(void)displayName;
// I am creating a function where we can display our name. 

@end

Now we will implement HomeViewContoller.m file.

@implementation HomeViewController

    /*This method is inbuild method which is use to initialize the class from xib. */

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

        return self;
        }

    //Inbulid method. But different from above. This method is called every time you load the xib in the your application.

    - (void)viewDidLoad
    {
    [super viewDidLoad];
    //This functions calls the viewDid load of the super class. i.e (UIViewController).
    name=@Tushar;

    [self displayName];// This our function which is called in view Did Load. 

    }


    -(void)displayName
    {    NSLog(@The name is %@,name);
    // After calling the method we will get the name is our 
    }