iOS/iPhone Page Control (UIPageControl) and ScrollView (UIScrollView) (iPhone, iPad)

//
//  ViewController.h
//
//  Created by Weerachai on 11/4/55 BE.
//  Copyright (c) 2555 Weerachai. All rights reserved.
//

#import <UIKit/UIKit.h>

@interface ViewController : UIViewController
{
    BOOL pageControlBeingUsed;
}

@property (retain, nonatomic) IBOutlet UIScrollView *scrollView;
@property (retain, nonatomic) IBOutlet UIPageControl *pageControl;

- (IBAction)changePage;

@end

//
//  ViewController.m
//
//  Created by Weerachai on 11/4/55 BE.
//  Copyright (c) 2555 Weerachai. All rights reserved.
//

#import "ViewController.h"

@interface ViewController ()
{
    NSMutableArray *myObject;
    
}
@end

@implementation ViewController



- (void)viewDidLoad
{
    [super viewDidLoad];
	// Do any additional setup after loading the view, typically from a nib.
    
    myObject = [[NSMutableArray alloc] init];
    
    [myObject addObject:@"ThaiCreate.Com 1"];
    [myObject addObject:@"ThaiCreate.Com 2"];
    [myObject addObject:@"ThaiCreate.Com 3"];
    [myObject addObject:@"ThaiCreate.Com 4"];
    [myObject addObject:@"ThaiCreate.Com 5"];
    [myObject addObject:@"ThaiCreate.Com 6"];
    [myObject addObject:@"ThaiCreate.Com 7"];
    [myObject addObject:@"ThaiCreate.Com 8"];
    [myObject addObject:@"ThaiCreate.Com 9"];
    
	
	pageControlBeingUsed = NO;
	
    
    CGRect screenRect = [[UIScreen mainScreen] bounds];
    CGFloat screenWidth = screenRect.size.width;
    CGFloat screenHight = screenRect.size.height;
    
	for (int i = 0; i < [myObject count]; i++) {
		CGRect frame;
		frame.origin.x = self.scrollView.frame.size.width * i;
		frame.origin.y = 0;
		frame.size = self.scrollView.frame.size;
		
        NSString *val = [myObject objectAtIndex:i];
        
        
        UILabel *txt=[[UILabel alloc] initWithFrame:CGRectMake(screenWidth*i,0,screenWidth ,screenHight)];
        txt.text = val;
        txt.textColor = [UIColor blackColor];
        txt.textAlignment = NSTextAlignmentCenter;
        
		[self.scrollView addSubview:txt];
        
		[txt release];
	}
	
    
	self.scrollView.contentSize = CGSizeMake(self.scrollView.frame.size.width * [myObject count], self.scrollView.frame.size.height-100);

	self.pageControl.currentPage = 0;
	self.pageControl.numberOfPages = [myObject count];

    
}

- (void)scrollViewDidScroll:(UIScrollView *)sender {
	if (!pageControlBeingUsed) {
		// Switch the indicator when more than 50% of the previous/next page is visible
		CGFloat pageWidth = self.scrollView.frame.size.width;
		int page = floor((self.scrollView.contentOffset.x - pageWidth / 2) / pageWidth) + 1;
		self.pageControl.currentPage = page;
	}
}

- (void)scrollViewWillBeginDragging:(UIScrollView *)scrollView {
	pageControlBeingUsed = NO;
}

- (void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView {
	pageControlBeingUsed = NO;
}

- (IBAction)changePage {
	// Update the scroll view to the appropriate page
	CGRect frame;
	frame.origin.x = self.scrollView.frame.size.width * self.pageControl.currentPage;
	frame.origin.y = 0;
	frame.size = self.scrollView.frame.size;
	[self.scrollView scrollRectToVisible:frame animated:YES];
	
	pageControlBeingUsed = YES;
}

- (void)viewDidUnload {
	self.scrollView = nil;
	self.pageControl = nil;
}

- (void)didReceiveMemoryWarning
{
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

- (void)dealloc {
    [_scrollView release];
    [_pageControl release];
    [super dealloc];
}
@end