实现在ios开发中的App滑动封面 UIScrollView

- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view.
_scrollView = [[UIScrollView alloc] initWithFrame:CGRectMake(0, 0, 340, 460)];
_scrollView.backgroundColor = [UIColor whiteColor];
_scrollView.delegate = self;
_scrollView.pagingEnabled = YES;
_scrollView.tag = INT_MAX;
_scrollView.showsHorizontalScrollIndicator = NO;

_scrollView.contentSize = CGSizeMake(340 * 4, 460);
[self.view addSubview:_scrollView];

int _x = 0;

for (int index = 0; index < 4; index++) {
UIImageView *imgScrollView = [[UIImageView alloc] initWithFrame:CGRectMake(0+_x, 0, 320, 460)];
imgScrollView.tag = index;
NSString *imgName = [NSString stringWithFormat:@"%d.JPG", index + 1];
imgScrollView.image = [UIImage imageNamed:imgName];
[_scrollView addSubview:imgScrollView];
_x += 340;

}

UIPageControl *pageControl = [[UIPageControl alloc] initWithFrame:CGRectMake(0, 180, 320, 50)];
pageControl.numberOfPages = 4;
pageControl.tag = 101;
[self.view addSubview:pageControl];
[pageControl release];
}

- (void) scrollViewDidEndDecelerating:(UIScrollView *)scrollView {
int current = scrollView.contentOffset.x / 320;
UIPageControl *pageControl = (UIPageControl *)[self.view viewWithTag:101];
pageControl.currentPage = current;

}