How to make paging or make page control in iphone?

Make paging in iphone is completely given demo with source code. In this demo paging will be done horizontally and pages will be scrolled by touching screen. For paging screen code snippets are here.

ViewController.h

#import <UIKit/UIKit.h>
@interface ViewController : UIViewController<UIScrollViewDelegate>
{
    UIScrollView* scrollView;
 
   
    NSMutableArray *PageControlBtns;
}
@property (strong, nonatomic) IBOutlet UIScrollView *scrollViewBar;
@end

ViewController.m

#import "ViewController.h"
#define PAGES_NUMBER 20
@interface ViewController ()
@end
@implementation ViewController
@synthesize scrollViewBar;
- (void)viewDidLoad
{  scrollView = [[UIScrollView alloc] initWithFrame:CGRectMake(0, 0, self.view.frame.size.width, self.view.frame.size.width)];
    scrollViewBar = [[UIScrollView alloc] initWithFrame:CGRectMake(0, 384, 320, 76)];
   
    scrollViewBar.pagingEnabled = YES;
    scrollViewBar.showsHorizontalScrollIndicator = NO;
    scrollViewBar.delegate = self;
    scrollViewBar.backgroundColor = [UIColor clearColor];
    [self.view addSubview:scrollViewBar];
    scrollView.pagingEnabled = YES;
    scrollView.showsHorizontalScrollIndicator = NO;
    scrollView.delegate = self;
    scrollView.backgroundColor = [UIColor clearColor];
    [self.view addSubview:scrollView];
   
    [self GeneratePages];
    [super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
}
-(void)GeneratePages
{
    UIImage *PageControlImg = [UIImage imageNamed:@"button-off.png"];
    int x_coord = (self.view.frame.size.width-PageControlImg.size.width*PAGES_NUMBER)/2.0;
   
    PageControlBtns = [[NSMutableArray alloc] init];
   
    for (int i=0; i<PAGES_NUMBER; i++)
    {
       
        UIView *Page = [[UIView alloc] initWithFrame:CGRectMake(scrollView.frame.size.width*i, 0.0, scrollView.frame.size.width, scrollView.frame.size.height)];
        Page.backgroundColor = [UIColor colorWithRed:0.32 green:0.55 blue:0.88 alpha:1.0];
       
        UILabel *titleLbl = [[UILabel alloc] initWithFrame:CGRectMake(10.0, 10.0, Page.frame.size.width-20.0, 40.0)];
        titleLbl.backgroundColor = [UIColor clearColor];
        titleLbl.textColor = [UIColor whiteColor];
        titleLbl.font = [UIFont boldSystemFontOfSize:16.0];
        titleLbl.text = [NSString stringWithFormat:@"This is page number %d", i+1];
       // titleLbl.textAlignment = UITextAlignmentCenter;
        [Page addSubview:titleLbl];
       
        [scrollView addSubview:Page];
       
        UIButton *PageControlBtn = [[UIButton alloc] initWithFrame:CGRectMake(x_coord+i*PageControlImg.size.width, scrollView.frame.origin.y+scrollView.frame.size.height+20.0, PageControlImg.size.width, PageControlImg.size.height)];
     
        [PageControlBtn setBackgroundImage:[UIImage imageNamed: (i==0)?@"button-on.png":@"button-off.png"] forState:UIControlStateNormal];
        [PageControlBtn setBackgroundImage:[UIImage imageNamed: @"button-on.png"] forState:UIControlStateHighlighted];
        [PageControlBtn setBackgroundImage:[UIImage imageNamed: @"button-off.png"] forState:UIControlStateDisabled];
        [PageControlBtn setTitleColor:[UIColor whiteColor] forState:UIControlStateHighlighted];
        [PageControlBtn setTitleColor:(i==0)?[UIColor whiteColor]:[UIColor grayColor] forState:UIControlStateNormal];
        PageControlBtn.titleLabel.font = [UIFont boldSystemFontOfSize:16.0];
      //  PageControlBtn.titleLabel.textAlignment = UITextAlignmentCenter;
        [PageControlBtn setTitle:[NSString stringWithFormat:@"%d", i+1] forState:UIControlStateNormal];
        [PageControlBtn setTitle:[NSString stringWithFormat:@"%d", i+1] forState:UIControlStateSelected];
        [PageControlBtn setTag:i+2000];
        [PageControlBtn addTarget:self action:@selector(onPageControlBtnPressed:) forControlEvents:UIControlEventTouchUpInside];
        [self.view addSubview:PageControlBtn];
       
        [PageControlBtns addObject:PageControlBtn];
    }
    scrollView.contentSize = CGSizeMake(scrollView.frame.size.width*PAGES_NUMBER, scrollView.frame.size.height);
    scrollViewBar.contentSize = CGSizeMake(320, 76);
}
-(void)onPageControlBtnPressed:(id)sender
{
    UIButton *button = (UIButton *)sender;
   
    int tag=button.tag-2000;
   
    [scrollView setContentOffset:CGPointMake(scrollView.frame.size.width*tag, 0) animated:YES];
   
    [self SetActivePageControlWithIndex:tag];
}
-(void)SetActivePageControlWithIndex:(int)index
{
    for (int i=0; i<[PageControlBtns count]; i++)
    {
        UIImage *backgroundImg = [[PageControlBtns objectAtIndex:i] backgroundImageForState:(i==index)?UIControlStateHighlighted:UIControlStateDisabled];
        [[PageControlBtns objectAtIndex:i] setBackgroundImage:backgroundImg forState:UIControlStateNormal];
        [[PageControlBtns objectAtIndex:i] setTitleColor:(i==index)?[UIColor whiteColor]:[UIColor grayColor] forState:UIControlStateNormal];
    }
}
-(void)scrollViewDidEndDecelerating:(UIScrollView *)sender
{
    CGFloat pageWidth = scrollView.frame.size.width;
    int page = floor((scrollView.contentOffset.x - pageWidth / 2) / pageWidth) + 1;
    [self SetActivePageControlWithIndex:page];
}
- (void)didReceiveMemoryWarning
{
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}
@end

Output Screens:

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