@interface RootViewController : UIViewController<UIScrollViewDelegate>

{

UIScrollView *_scrollView;

NSMutableArray *slideImages;

UIPageControl *_page;


}
@end
import "RootViewController.h"
@interface RootViewController ()
@end
@implementation RootViewController

(id)initWithNibName:(NSString )nibNameOrNil bundle:(NSBundle )nibBundleOrNil

{

self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];

if (self) {

    // Custom initialization

}

return self;


}

(void)viewDidLoad

{

[super viewDidLoad];



_scrollView = [[UIScrollView alloc]initWithFrame:CGRectMake(0, 20, 320, 240)];

_scrollView.bounces = NO;

_scrollView.pagingEnabled = YES;

_scrollView.delegate = self;

_scrollView.contentOffset = CGPointMake(320, 0);

_scrollView.contentSize = CGSizeMake(1920,240);

_scrollView.showsVerticalScrollIndicator =NO;

_scrollView.showsHorizontalScrollIndicator = NO;

_scrollView.userInteractionEnabled = YES;

[self.view addSubview:_scrollView];

[_scrollView release];



slideImages = [[NSMutableArray alloc]initWithObjects:@"1.jpeg",@"2.jpg",@"3.jpeg",@"4.jpeg", nil];



UIImageView *imageView = [[UIImageView alloc]

                          initWithImage:[UIImage imageNamed:[slideImages objectAtIndex:([slideImages count]-1)]]];

imageView.frame = CGRectMake(0, 0, 320, 240);

[_scrollView addSubview:imageView];

[imageView release];



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

    //loop this bit

    UIImageView *imageView = [[UIImageView alloc]

                              initWithImage:[UIImage imageNamed:[slideImages objectAtIndex:i]]];

    imageView.frame = CGRectMake(320*i+320, 0, 320, 240);

    imageView.userInteractionEnabled = YES;

    [_scrollView addSubview:imageView];

    [imageView release];

}



imageView = [[UIImageView alloc] initWithImage:[UIImage imageNamed:[slideImages objectAtIndex:0]]];

imageView.frame = CGRectMake(320*5, 0, 320, 240);

[_scrollView addSubview:imageView];



[imageView release];





_page = [[UIPageControl alloc]initWithFrame:CGRectMake(240, 230, 70, 30)];

_page.numberOfPages = 4;

_page.currentPage = 0;




//    _page.backgroundColor = [UIColor grayColor];

[_page addTarget:self action:@selector(pageAction) forControlEvents:UIControlEventTouchUpInside];

[self.view addSubview:_page];

[_page release];


// Do any additional setup after loading the view.
}

(void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView

{

int currentPage = (_scrollView.contentOffset.x - _scrollView.frame.size.width

                         / ([slideImages count]+2)) / _scrollView.frame.size.width + 1;

NSLog(@"%d",currentPage);

if (currentPage==0) {

    [_scrollView scrollRectToVisible:CGRectMake(320*4, 0, 320, 240) animated:NO];

}

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

        //如果是最后+1,也就是要開始循環的第一個

        [_scrollView scrollRectToVisible:CGRectMake(320, 0, 320, 240) animated:NO];

    }


}

(void)scrollViewDidScroll:(UIScrollView *)sender

{

int page = _scrollView.contentOffset.x/320-1;

_page.currentPage = page;


}
-(void)pageAction
{

int page = _page.currentPage;

[_scrollView setContentOffset:CGPointMake(320 * (page+1), 0)];


}

(void)didReceiveMemoryWarning

{

[super didReceiveMemoryWarning];

// Dispose of any resources that can be recreated.


}

(void)dealloc {


[slideImages release];

[super dealloc];


}
@end</pre>