UIScrollerView循环滚动，加定时器和pageControl

.h文件

@interface MainViewController : UIViewController<UIScrollViewDelegate>{

BOOL isDeceleration;
}

@property (nonatomic, retain)UIScrollView * myScrollView;
@property (nonatomic, retain)NSMutableArray * imageArray;
@property (nonatomic, retain) NSTimer * time;
@property (nonatomic, retain) UIPageControl * myPageControl;

@end

.m文件

#import "Main<span style="font-family: Arial, Helvetica, sans-serif;">ViewController.h"</span>

@interface MainViewController ()

@end

@implementation ViewController
@synthesize myScrollView,imageArray,time,myPageControl;

- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
if (self) {
// Custom initialization
}
return self;
}
#pragma mark - ScrollView Delegate
-(void)scrollViewWillBeginDecelerating:(UIScrollView *)scrollView{
isDeceleration = YES;

}
-(void)scrollViewDidEndScrollingAnimation:(UIScrollView *)scrollView{

[self scrollViewDidEndDecelerating:myScrollView];
}

-(void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView
{
isDeceleration = NO;
int currentPage = floor((self.myScrollView.contentOffset.x-self.myScrollView.frame.size.width/([imageArray count]+2))/self.myScrollView.frame.size.width)+1;

if (currentPage==0) {
[self.myScrollView scrollRectToVisible:CGRectMake(myScrollView.frame.size.width*[imageArray count], myScrollView.frame.origin.y, myScrollView.frame.size.width, myScrollView.frame.size.height) animated:NO];

}else if(currentPage==([imageArray count]+1)){//如果最后加一，也就是开始循环的第一个
[self.myScrollView scrollRectToVisible:CGRectMake(myScrollView.frame.size.width, myScrollView.frame.origin.y, myScrollView.frame.size.width, myScrollView.frame.size.height) animated:NO];

}

}

- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view from its nib.
self.imageArray = [[[NSMutableArray alloc]initWithObjects:@"t_g_egg1_no@2x.png",@"t_g_egg1@2x.png",@"t_g_image_egg0.png",@"t_g_image_quan0@2x.png",@"y_g_tip_image_egg1.png",@"y_g_tip_image_quan1@2x.png",nil]autorelease];

self.myScrollView = [[[UIScrollView alloc]initWithFrame:CGRectMake(20, 20, 280, 360)]autorelease];
myScrollView.contentSize = CGSizeMake(myScrollView.frame.size.width * ([imageArray count] + 2), myScrollView.frame.size.height);
myScrollView.delegate = self;
myScrollView.bounces = YES;
myScrollView.pagingEnabled = YES;
myScrollView.userInteractionEnabled = YES;
[self.view addSubview:myScrollView];

//把最后一张图片放到首页的位置
UIImageView * imgView =[[UIImageView alloc]initWithFrame:CGRectMake(myScrollView.frame.size.width *0, myScrollView.frame.origin.y, myScrollView.frame.size.width, myScrollView.frame.size.height)];
imgView.image = [UIImage imageNamed:[imageArray objectAtIndex:[imageArray count]-1]];
[myScrollView addSubview:imgView];
[imgView release];

//从第一张开始加
for (int i = 0; i < [imageArray count]; i++) {

UIImageView * imgView1 =[[UIImageView alloc]initWithFrame:CGRectMake(myScrollView.frame.size.width *(i+1), myScrollView.frame.origin.y, myScrollView.frame.size.width, myScrollView.frame.size.height)];
imgView1.image = [UIImage imageNamed:[imageArray objectAtIndex:i]];
[myScrollView addSubview:imgView1];
[imgView1 release];
}
//把第一张图片放到最后的位置
UIImageView * imgView0 =[[UIImageView alloc]initWithFrame:CGRectMake(myScrollView.frame.size.width * ([imageArray count]+1), myScrollView.frame.origin.y, myScrollView.frame.size.width, myScrollView.frame.size.height)];
imgView0.image = [UIImage imageNamed:[imageArray objectAtIndex:0]];
[myScrollView addSubview:imgView0];
[imgView0 release];

[myScrollView setContentOffset:CGPointMake(0, 0)];
[myScrollView scrollRectToVisible:CGRectMake(myScrollView.frame.size.width, myScrollView.frame.origin.y, myScrollView.frame.size.width, myScrollView.frame.size.height) animated:NO];

//与pagecontrol结合使用
self.myPageControl =[[UIPageControl alloc]initWithFrame:CGRectMake(30, 360, 260, 30)];
myPageControl.currentPage = 0;
myPageControl.numberOfPages = [imageArray count];
[self.view addSubview:myPageControl];
[myPageControl release];

//加入定时器
self.time = [NSTimer scheduledTimerWithTimeInterval:3 target:self selector:@selector(pageChange) userInfo:nil repeats:YES];

}

-(void)pageChange
{
if (isDeceleration==NO) {
[myScrollView setContentOffset:CGPointMake(myScrollView.contentOffset.x+280, myScrollView.contentOffset.y) animated:YES];
CGFloat pageWidth = myScrollView.frame.size.width;
int page = floor((myScrollView.contentOffset.x - pageWidth / 2) / pageWidth) + 1;
myPageControl.currentPage = page;
if (page==[imageArray count]) {//如果到最后一页，设置currentPage=0；重新开始
myPageControl.currentPage = 0;
}
}
}

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

-(void)dealloc
{
[myScrollView release];
[imageArray release];
[time release];
[myPageControl release];
myScrollView.delegate = nil;
[super dealloc];

}

- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
{
return (interfaceOrientation == UIInterfaceOrientationPortrait);
}

@end

原文地址：http://blog.sina.com.cn/s/blog_b8e97683010189he.html

解决动画未加载完切换到头尾页面而无法正常显示的问题：

- (void)scrollViewDidScroll:(UIScrollView *)scrollView
{
int offsetX = (int)myScrollView.contentOffset.x;
if (offsetX - myScrollView.contentOffset.x == 0 && offsetX % (int)VIEWWIDTH == 0) {
[myScrollView setUserInteractionEnabled:YES];
}
else{
[myScrollView setUserInteractionEnabled:NO];
}
}