iOS UIPageControl使用

#import <UIKit/UIKit.h>@interface ViewController : UIViewController<UIScrollViewDelegate>{    UIScrollView* helpScrView;    UIPageControl* pageCtrl;}@end

#import "ViewController.h"@interface ViewController ()@end@implementation ViewController- (void)viewDidLoad{    [super viewDidLoad];    CGRect bounds = self.view.frame;  //获取界面区域        //加载蒙板图片，限于篇幅，这里仅显示一张图片的加载方法    UIImageView* imageView1 = [[[UIImageView alloc] initWithFrame:CGRectMake(0, bounds.origin.y, bounds.size.width, bounds.size.height)] autorelease];  //创建UIImageView，位置大小与主界面一样。    [imageView1 setImage:[UIImage imageNamed:@"bg.png"]];  //加载图片help01.png到imageView1中。    //imageView1.alpha = 0.5f;  //将透明度设为50%。    UIImageView* imageView2 = [[[UIImageView alloc] initWithFrame:CGRectMake(1*bounds.size.width, bounds.origin.y, bounds.size.width, bounds.size.height)] autorelease];  //创建UIImageView，位置大小与主界面一样。    [imageView2 setImage:[UIImage imageNamed:@"bg.png"]];    //继续加载图片    //。。。。        //创建UIScrollView    helpScrView = [[UIScrollView alloc] initWithFrame:CGRectMake(bounds.origin.x, bounds.origin.y, bounds.size.width, 300)];  //创建UIScrollView，位置大小与主界面一样。    [helpScrView setContentSize:CGSizeMake(bounds.size.width * 6, 300)];  //设置全部内容的尺寸，这里帮助图片是3张，所以宽度设为界面宽度*3，高度和界面一致。    helpScrView.pagingEnabled = YES;  //设为YES时，会按页滑动    helpScrView.bounces = NO; //取消UIScrollView的弹性属性，这个可以按个人喜好来定    [helpScrView setDelegate:self];//UIScrollView的delegate函数在本类中定义    helpScrView.showsHorizontalScrollIndicator = NO;  //因为我们使用UIPageControl表示页面进度，所以取消UIScrollView自己的进度条。    [helpScrView addSubview:imageView2];    [helpScrView addSubview:imageView1];//将UIImageView添加到UIScrollView中。    [self.view addSubview:helpScrView]; //将UIScrollView添加到主界面上。        //创建UIPageControl    pageCtrl = [[UIPageControl alloc] initWithFrame:CGRectMake(0, 400, bounds.size.width, 30)];  //创建UIPageControl，位置在屏幕最下方。    pageCtrl.numberOfPages = 6;//总的图片页数    pageCtrl.currentPage = 0; //当前页    [pageCtrl addTarget:self action:@selector(pageTurn:) forControlEvents:UIControlEventValueChanged];  //用户点击UIPageControl的响应函数    [self.view addSubview:pageCtrl];  //将UIPageControl添加到主界面上。}//其次是UIScrollViewDelegate的scrollViewDidEndDecelerating函数，用户滑动页面停下后调用该函数。- (void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView{    //更新UIPageControl的当前页    CGPoint offset = scrollView.contentOffset;    CGRect bounds = scrollView.frame;    [pageCtrl setCurrentPage:offset.x / bounds.size.width];    NSLog(@"%f",offset.x / bounds.size.width);}//然后是点击UIPageControl时的响应函数pageTurn- (void)pageTurn:(UIPageControl*)sender{    //令UIScrollView做出相应的滑动显示    CGSize viewSize = helpScrView.frame.size;    CGRect rect = CGRectMake(sender.currentPage * viewSize.width, 0, viewSize.width, viewSize.height);    [helpScrView scrollRectToVisible:rect animated:YES];}- (void)didReceiveMemoryWarning{    [super didReceiveMemoryWarning];    // Dispose of any resources that can be recreated.}@end

修改PageControl d的小点点的图标

重写类！！

////  GrayPageControl.h//  iPlayer////  Created by 屎壳郎情调 on 13-9-11.//  Copyright (c) 2013年 ibokan. All rights reserved.//#import <UIKit/UIKit.h>@interface GrayPageControl : UIPageControl{    UIImage* activeImage;    UIImage* inactiveImage;}@end

////  GrayPageControl.m//  iPlayer////  Created by 屎壳郎情调 on 13-9-11.//  Copyright (c) 2013年 ibokan. All rights reserved.//#import "GrayPageControl.h"@implementation GrayPageControl-(id) initWithFrame:(CGRect)frame{    self = [super initWithFrame:frame];        activeImage = [UIImage imageNamed:@"appleDot@2x"];    inactiveImage = [UIImage imageNamed:@"pageDot@2x"] ;        return self;}-(void) updateDots{    for (int i = 0; i < [self.subviews count]; i++)    {        UIImageView* dot = [self.subviews objectAtIndex:i];        if (i == self.currentPage) dot.image = activeImage;        else dot.image = inactiveImage;    }}-(void) setCurrentPage:(NSInteger)page{    [super setCurrentPage:page];    //修改图标大小    for (NSUInteger subviewIndex = 0; subviewIndex < [self.subviews count]; subviewIndex++) {                UIImageView* subview = [self.subviews objectAtIndex:subviewIndex];                CGSize size;                size.height = 10;                size.width = 10;                [subview setFrame:CGRectMake(subview.frame.origin.x, subview.frame.origin.y,                                                                          size.width,size.height)];            }        [self updateDots];}/*// Only override drawRect: if you perform custom drawing.// An empty implementation adversely affects performance during animation.- (void)drawRect:(CGRect)rect{    // Drawing code}*/@end