UIScroll View in iOS - Objective C

1) create single view application
2) Add below code in view controller.h

@interface ViewController : UIViewController

{

    UIScrollView *scrollView;

}

@end

3) Add below code in view controller.m

- (void)viewDidLoad {

    scrollView=[[UIScrollView alloc]init];

    scrollView.frame=self.view.bounds;

    

    scrollView.contentSize=CGSizeMake(self.view.frame.size.width, self.view.frame.size.height*3);

    scrollView.backgroundColor=[UIColor grayColor];

    [self.view addSubview:scrollView];

    

    UIImageView *img1=[[UIImageView alloc]init];

    img1.frame=CGRectMake(10, 40, 300, 400);

    img1.image=[UIImage imageNamed:@"1.jpeg"];

    [scrollView addSubview:img1];

    

    UIImageView *img2=[[UIImageView alloc]init];

    img2.frame=CGRectMake(10, 480, 300, 400);

    img2.image=[UIImage imageNamed:@"2.jpeg"];

    [scrollView addSubview:img2];

    

    UIImageView *img3=[[UIImageView alloc]init];

    img3.frame=CGRectMake(10, 920, 300, 400);

    img3.image=[UIImage imageNamed:@"3.jpeg"];

    [scrollView addSubview:img3];

    

    

    [super viewDidLoad];

    // Do any additional setup after loading the view, typically from a nib.

}