IOS scrollView以及pageControl使用

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#import <UIKit/UIKit.h>

@interface CRViewController : UIViewController
{
    UIScrollView * scrollView;
    UIPageControl * pageControl;
}

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

@end



//
//  CRViewController.m
//  pageControl
//
//  Created by chaoxiao zhuang on 12-12-22.
//  Copyright (c) 2012年 taizhouxueyuan. All rights reserved.
//

#import "CRViewController.h"

@implementation CRViewController

@synthesize scrollView;
@synthesize pageControl;

- (void)didReceiveMemoryWarning
{
    [super didReceiveMemoryWarning];
    // Release any cached data, images, etc that aren't in use.
}

#pragma mark - View lifecycle

-(void)pageChanged:(UIPageControl*)page
{
    int p = page.currentPage;
    [scrollView scrollRectToVisible:CGRectMake(320*p, 0, 320, 480) animated:YES];
}

-(void)scrollViewDidScroll:(UIScrollView*)scrollView
{
    CGFloat pageWith = scrollView.frame.size.width;
    int page = floor((scrollView.contentOffset.x - pageWith/2)/pageWith)+1;
    self.pageControl.currentPage = page;
}

- (void)viewDidLoad
{
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.
    
    scrollView = [[UIScrollView alloc]initWithFrame:CGRectMake(0, 0, 320, 480)];
    scrollView.delegate = self;
    [scrollView setContentSize:CGSizeMake(320*4, 480)];
    //scrollView.showsHorizontalScrollIndicator = YES;
    scrollView.showsVerticalScrollIndicator = YES;
    scrollView.pagingEnabled = YES;
    [scrollView setBackgroundColor:[UIColor redColor]];
    
    UIView * view1 = [[UIView alloc]initWithFrame:CGRectMake(0, 0, 320, 480)];
    [view1 setBackgroundColor:[UIColor grayColor]];
    [scrollView addSubview:view1];
    
    UIView * view2 = [[UIView alloc]initWithFrame:CGRectMake(320, 0, 320, 480)];
    [view2 setBackgroundColor:[UIColor blueColor]];
    [scrollView addSubview:view2];
    
    UIView * view3 = [[UIView alloc]initWithFrame:CGRectMake(320*2, 0, 320, 480)];
    [view3 setBackgroundColor:[UIColor greenColor]];
    [scrollView addSubview:view3];
    
    UIView * view4 = [[UIView alloc]initWithFrame:CGRectMake(320*3, 0, 320, 480)];
    [view4 setBackgroundColor:[UIColor yellowColor]];
    [scrollView addSubview:view4];
    
    [self.view addSubview:scrollView];
    
    
    pageControl = [[UIPageControl alloc]initWithFrame:CGRectMake(0, 0, 200, 20)];
    pageControl.center = CGPointMake(160, 40);
    pageControl.numberOfPages = 4;
  
    [pageControl addTarget:self action:@selector(pageChanged:) forControlEvents:UIControlEventValueChanged];
    
    [self.view addSubview:pageControl];
}

- (void)viewDidUnload
{
    [super viewDidUnload];
    // Release any retained subviews of the main view.
    // e.g. self.myOutlet = nil;
}

- (void)viewWillAppear:(BOOL)animated
{
    [super viewWillAppear:animated];
}

- (void)viewDidAppear:(BOOL)animated
{
    [super viewDidAppear:animated];
}

- (void)viewWillDisappear:(BOOL)animated
{
    [super viewWillDisappear:animated];
}

- (void)viewDidDisappear:(BOOL)animated
{
    [super viewDidDisappear:animated];
}

- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
{
    // Return YES for supported orientations
    return (interfaceOrientation != UIInterfaceOrientationPortraitUpsideDown);
}