UIScrollView *scrollView = [[UIScrollView alloc] initWithFrame:[[UIScreen mainScreen] bounds]];scrollView.backgroundColor = [UIColor colorWithRed:0.586 green:1.000 blue:0.977 alpha:1.000];

   是否能滚动到顶部(点击状态栏触发), 默认是YESscrollView.scrollsToTop = YES;内容页的偏移量scrollView.contentOffset = CGPointMake(0, 0);[scrollView setContentOffset:CGPointMake(0, 0) animated:YES];是否可以滚动, 默认YESscrollView.scrollEnabled = YES;是否显示垂直滚动条, 默认是YESscrollView.showsVerticalScrollIndicator = YES;是否显示水平滚动条, 默认是YESscrollView.showsHorizontalScrollIndicator = YES;是否回弹(前提: 能够滚动), 默认YESscrollView.bounces = YES;是否回弹(前提: 不能滚动, bounces是YES), 默认NOscrollView.alwaysBounceVertical = YES;scrollView.alwaysBounceHorizontal = YES;是否整屏滚动, 默认是NOscrollView.pagingEnabled = NO;代理scrollView.delegate = self;scrollView.tag = 1024;[self.view addSubview:scrollView];[scrollView release];

    [scrollView addSubview:imageView];[imageView release];

   当前的缩放比例, 默认值1.0scrollView.zoomScale = 1.0;最大缩放比例, 默认为1.0scrollView.maximumZoomScale = 4.0;最小缩放比例, 默认为1.0scrollView.minimumZoomScale = 0.5;

   UIPageControl *pageControl = [[UIPageControl alloc] initWithFrame:CGRectMake(100, 600, 175, 40)];pageControl.backgroundColor = [UIColor blackColor];设置页数, 默认为0pageControl.numberOfPages = 5;当前页数, 默认为0pageControl.currentPage = 1;未选中圆点颜色pageControl.pageIndicatorTintColor = [UIColor redColor];选中圆点颜色pageControl.currentPageIndicatorTintColor = [UIColor greenColor];当只有一页时, 是否隐藏pageControl.hidesForSinglePage = YES;[pageControl addTarget:self action:@selector(changePage:) forControlEvents:UIControlEventValueChanged];[self.view addSubview:pageControl];[pageControl release];

    UIButton *nextButton = [UIButton buttonWithType:UIButtonTypeSystem];nextButton.frame = CGRectMake(375 - 100, 40, 80, 30);[nextButton setTitle:@"下 一 页" forState:UIControlStateNormal];[nextButton setTitleColor:[UIColor whiteColor] forState:UIControlStateNormal];[nextButton addTarget:self action:@selector(nextPage) forControlEvents:UIControlEventTouchUpInside];[self.view addSubview:nextButton];UIButton *reset = [UIButton buttonWithType:UIButtonTypeSystem];reset.frame = CGRectMake(20, 40, 80, 30);[reset setTitle:@"还    原" forState:UIControlStateNormal];[reset setTitleColor:[UIColor whiteColor] forState:UIControlStateNormal];[reset addTarget:self action:@selector(reset) forControlEvents:UIControlEventTouchUpInside];[self.view addSubview:reset];- (void)nextPage {UIScrollView *scrollView = (UIScrollView *)[self.view viewWithTag:1024];改变偏移量
//  scrollView.contentOffset = CGPointMake(375, 0);[scrollView setContentOffset:CGPointMake(375, 0) animated:YES];}- (void)reset {UIScrollView *scrollView = (UIScrollView *)[self.view viewWithTag:1024];重置scrollView的缩放比例
//    scrollView.zoomScale = 1.0;[scrollView setZoomScale:1.0 animated:YES];
}

#pragma mark - UIScrollViewDelegate
//当滚动视图的偏移量做改变, 执行这个方法
- (void)scrollViewDidScroll:(UIScrollView *)scrollView {NSLog(@"已经滚动");
}- (void)scrollViewWillBeginDragging:(UIScrollView *)scrollView {NSLog(@"将要开始拖拽");
}- (void)scrollViewWillEndDragging:(UIScrollView *)scrollView withVelocity:(CGPoint)velocity targetContentOffset:(inout CGPoint *)targetContentOffset {//inout: 方法 内部使用的变量 和 外部使用的变量 是同一个NSLog(@"将要结束拖拽");
}- (void)scrollViewDidEndDragging:(UIScrollView *)scrollView willDecelerate:(BOOL)decelerate {NSLog(@"已经结束拖拽");
}- (void)scrollViewWillBeginDecelerating:(UIScrollView *)scrollView {NSLog(@"将要开始减速");
}- (void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView {NSLog(@"已经结束减速");
}//调用setContentOffset:animated:这个方法触发
- (void)scrollViewDidEndScrollingAnimation:(UIScrollView *)scrollView {NSLog(@"已经结束滚动动画");
}- (BOOL)scrollViewShouldScrollToTop:(UIScrollView *)scrollView {return YES;
}- (void)scrollViewDidScrollToTop:(UIScrollView *)scrollView {NSLog(@"已经滚动到顶部");
}- (UIView *)viewForZoomingInScrollView:(UIScrollView *)scrollView {//指定缩放的视图return imageView;
}- (void)scrollViewDidZoom:(UIScrollView *)scrollView {NSLog(@"滚动视图已经缩放");
}- (void)scrollViewWillBeginZooming:(UIScrollView *)scrollView withView:(UIView *)view {NSLog(@"滚动视图将要开始缩放");
}

- (void)scrollViewDidEndZooming:(UIScrollView *)scrollView withView:(UIView *)view atScale:(CGFloat)scale {

    NSLog(@"滚动视图已经结束缩放");

} 

#import "WelcomeViewController.h"
@interface WelcomeViewController () <UIScrollViewDelegate> {UIScrollView *bgScrollView;UIPageControl *pagecontrol;
}
@end
@implementation WelcomeViewController
- (void)viewDidLoad {[super viewDidLoad];// Do any additional setup after loading the view.//创建滚动视图bgScrollView = [[UIScrollView alloc] initWithFrame:self.view.frame];bgScrollView.backgroundColor = [UIColor colorWithRed:0.966 green:1.000 blue:0.429 alpha:1.000];bgScrollView.contentSize = CGSizeMake(320 * 4, 568);bgScrollView.pagingEnabled = YES;bgScrollView.showsHorizontalScrollIndicator = NO;bgScrollView.tag = 101;bgScrollView.delegate = self;[self.view addSubview:bgScrollView];[bgScrollView release];for (NSInteger i = 1; i <= 4 ; i++) {NSString *name = [NSString stringWithFormat:@"%ld.jpg", i];UIImageView *imageView = [[UIImageView alloc] initWithImage:[UIImage imageNamed:name]];imageView.frame = CGRectMake(320 * (i - 1), 0, 320, 568);[bgScrollView addSubview:imageView];}pagecontrol = [[UIPageControl alloc] initWithFrame:CGRectMake(0, 528, 320, 40)];
//  pagecontrol.backgroundColor = [UIColor yellowColor];pagecontrol.numberOfPages = 4;pagecontrol.pageIndicatorTintColor = [UIColor grayColor];pagecontrol.currentPageIndicatorTintColor = [UIColor greenColor];[pagecontrol addTarget:self action:@selector(changePage:) forControlEvents:UIControlEventValueChanged];[self.view addSubview:pagecontrol];[pagecontrol release];
}
- (void)changePage:(UIPageControl *)pageControl {bgScrollView.contentOffset = CGPointMake(320 * pageControl.currentPage, 0);
}
- (void)didReceiveMemoryWarning {[super didReceiveMemoryWarning];// Dispose of any resources that can be recreated.
}
#pragma mark - UIScrollViewDelegate
- (void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView
{pagecontrol.currentPage = scrollView.contentOffset.x / 320;NSLog(@"%.2lf", scrollView.contentOffset.x / 320);
}
@end