原文链接：http://blog.csdn.net/xiaoxiangzhu660810/article/details/8728267

研究了一整天的成果，也借鉴了网上的一些资料，参考了http://huluwa.me/blog/ios-uiscrollview-loop/.的思想.主要实现了以下功能：

     1.自动滑动图片，UIPageControl会随着图片滑动而改变；

     2.用户可以手动切换图片，左右切换均可，当用户手动滑动图片时，图片停止自动切换；

     3.实现了图片的循环播放；

     4.UIPageControl可点击从而实现向左或右滑动，当用户点击UIPageControl时，图片不再自动切换；

    直接上代码吧，不懂的后面还有工程和说明文档也一并附上(原来这个不能直接上传附件，要的就去资源页下载吧：http://download.csdn.net/detail/zhuiyi316/4434616)。

    首先是.h文件，注意自己将IBOutlet和IBAction与storyBoard中拖入的控件相关联，我用的XCode4.3.1.

    

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#import <UIKit/UIKit.h>  

  

@interface ViewController : UIViewController<UIScrollViewDelegate>  

{  

    NSMutableArray *imageArray;//存放图片  

    NSTimer *myTimer;//定时器  

      

}  

@property(nonatomic,retain) IBOutlet UIScrollView *myScrollView;  

@property(nonatomic,retain) IBOutlet  

    UIPageControl *pageControl;  

  

-(IBAction)pageTurn:(UIPageControl *)sender;  

@end  

   然后是.m文件，自己添加图片。#import <QuartzCore/QuartzCore.h>是用来设置边角的。

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#import "ViewController.h"  

#import <QuartzCore/QuartzCore.h>  

@interface ViewController ()  

  

@end  

  

@implementation ViewController  

@synthesize myScrollView,pageControl;  

  

-(void)initArray  

{  

    imageArray=[NSArray arrayWithObjects: [UIImage imageNamed:@"share.png"],[UIImage imageNamed:@"home_baike.png"],[UIImage imageNamed:@"home_chat.png"],[UIImage imageNamed:@"Icon.png"],nil];  

    //存放图片的数组  

  

}  

- (void)viewDidLoad  

{  

    [super viewDidLoad];  

    [self initArray];  

    [self configScrollView];    

   }  

-(void)configScrollView  

{  

    /*  

     @//初始化UIScrollView，设置相关属性，均可在storyBoard中设置  

     CGRect frame=CGRectMake(0, 0, 320, 480);  

     self.myScrollView = [[UIScrollView alloc]initWithFrame:frame];    //scrollView的大小  

     self.myScrollView.backgroundColor=[UIColor blueColor];  

     self.myScrollView.pagingEnabled=YES;//以页为单位滑动，即自动到下一页的开始边界  

     self.myScrollView.showsVerticalScrollIndicator=NO;  

     self.myScrollView.showsHorizontalScrollIndicator=NO;//隐藏垂直和水平显示条  

     */    

    self.myScrollView.delegate=self;  

    UIImageView *firstView=[[UIImageView alloc] initWithImage:[imageArray lastObject]];  

    CGFloat Width=self.myScrollView.frame.size.width;  

    CGFloat Height=self.myScrollView.frame.size.height;  

    firstView.frame=CGRectMake(0, 0, Width, Height);  

    [self.myScrollView addSubview:firstView];  

    //set the last as the first  

      

    for (int i=0; i<[imageArray count]; i++) {  

        UIImageView *subViews=[[UIImageView alloc] initWithImage:[imageArray objectAtIndex:i]];  

        subViews.frame=CGRectMake(Width*(i+1), 0, Width, Height);  

        [self.myScrollView addSubview: subViews];  

    }  

      

    UIImageView *lastView=[[UIImageView alloc] initWithImage:[imageArray objectAtIndex:0]];  

    lastView.frame=CGRectMake(Width*(imageArray.count+1), 0, Width, Height);  

    [self.myScrollView addSubview:lastView];  

    //set the first as the last  

      

    [self.myScrollView setContentSize:CGSizeMake(Width*(imageArray.count+2), Height)];  

    [self.view addSubview:self.myScrollView];  

    [self.myScrollView scrollRectToVisible:CGRectMake(Width, 0, Width, Height) animated:NO];  

    //show the real first image,not the first in the scrollView  

      

/*   

@//设置pageControl的位置，及相关属性，可选  

   CGRect pageControlFrame=CGRectMake(100, 160, 78, 36);  

   self.pageControl=[[UIPageControl alloc]initWithFrame:pageControlFrame];  

      

    [self.pageControl setBounds:CGRectMake(0, 0, 16*(self.pageControl.numberOfPages-1), 16)];//设置pageControl中点的间距为16  

    [self.pageControl.layer setCornerRadius:8];//设置圆角  

*/  

    self.pageControl.numberOfPages=imageArray.count;   

//    self.pageControl.backgroundColor=[UIColor blueColor];//背景  

    self.pageControl.currentPage=0;  

    self.pageControl.enabled=YES;  

    [self.view addSubview:self.pageControl];  

    [self.pageControl addTarget:self action:@selector(pageTurn:)forControlEvents:UIControlEventValueChanged];  

      

    myTimer=[NSTimer scheduledTimerWithTimeInterval:2.0f target:self selector:@selector(scrollToNextPage:) userInfo:nil repeats:YES];  

      

}  

  

#pragma UIScrollView delegate  

-(void)scrollToNextPage:(id)sender  

{  

    int pageNum=self.pageControl.currentPage;  

    CGSize viewSize=self.myScrollView.frame.size;  

    CGRect rect=CGRectMake((pageNum+2)*viewSize.width, 0, viewSize.width, viewSize.height);  

    [self.myScrollView scrollRectToVisible:rect animated:NO];  

    pageNum++;  

    if (pageNum==imageArray.count) {  

        CGRect newRect=CGRectMake(viewSize.width, 0, viewSize.width, viewSize.height);  

        [self.myScrollView scrollRectToVisible:newRect animated:NO];  

    }  

}  

-(void)scrollViewDidScroll:(UIScrollView *)scrollView  

{  

    CGFloat pageWidth=self.myScrollView.frame.size.width;   

    int currentPage=floor((self.myScrollView.contentOffset.x-pageWidth/2)/pageWidth)+1;  

    if (currentPage==0) {  

        self.pageControl.currentPage=imageArray.count-1;  

    }else if(currentPage==imageArray.count+1){  

        self.pageControl.currentPage=0;  

    }  

    self.pageControl.currentPage=currentPage-1;  

      

}  

-(void)scrollViewWillBeginDragging:(UIScrollView *)scrollView  

{  

    [myTimer invalidate];  

}  

-(void)scrollViewDidEndDragging:(UIScrollView *)scrollView willDecelerate:(BOOL)decelerate  

{  

    myTimer=[NSTimer scheduledTimerWithTimeInterval:2.0f target:self selector:@selector(scrollToNextPage:) userInfo:nil repeats:YES];  

}  

-(void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView  

{  

    CGFloat pageWidth=self.myScrollView.frame.size.width;  

    CGFloat pageHeigth=self.myScrollView.frame.size.height;  

    int currentPage=floor((self.myScrollView.contentOffset.x-pageWidth/2)/pageWidth)+1;  

    NSLog(@"the current offset==%f",self.myScrollView.contentOffset.x);  

    NSLog(@"the current page==%d",currentPage);  

      

    if (currentPage==0) {  

        [self.myScrollView scrollRectToVisible:CGRectMake(pageWidth*imageArray.count, 0, pageWidth, pageHeigth) animated:NO];  

        self.pageControl.currentPage=imageArray.count-1;  

        NSLog(@"pageControl currentPage==%d",self.pageControl.currentPage);  

        NSLog(@"the last image");  

        return;  

    }else  if(currentPage==[imageArray count]+1){  

        [self.myScrollView scrollRectToVisible:CGRectMake(pageWidth, 0, pageWidth, pageHeigth) animated:NO];  

        self.pageControl.currentPage=0;  

        NSLog(@"pageControl currentPage==%d",self.pageControl.currentPage);  

        NSLog(@"the first image");  

        return;  

    }  

    self.pageControl.currentPage=currentPage-1;  

    NSLog(@"pageControl currentPage==%d",self.pageControl.currentPage);  

      

}  

-(IBAction)pageTurn:(UIPageControl *)sender  

{  

    int pageNum=pageControl.currentPage;  

    CGSize viewSize=self.myScrollView.frame.size;  

    [self.myScrollView setContentOffset:CGPointMake((pageNum+1)*viewSize.width, 0)];  

    NSLog(@"myscrollView.contentOffSet.x==%f",myScrollView.contentOffset.x);  

    NSLog(@"pageControl currentPage==%d",self.pageControl.currentPage);   [myTimer invalidate];  

}  

  

@end