/** 整个背景滚动视图*/
@property (nonatomic,strong) UIScrollView *scrol;
/** 添加pagecontrol*/
@property (nonatomic,strong) UIPageControl *pageControl;

- (void)viewDidLoad
{
    [super viewDidLoad];
    
   UIScrollView *scrol = [[UIScrollView alloc]init];
    //可视范围
    scrol.frame = self.view.bounds;
    self.scrol = scrol;
    [self.view addSubview:scrol];

     CGFloat scrolWidth=scrol.frame.size.width;
     CGFloat scrolHeight=scrol.frame.size.height;


    //添加所有的imagesview
    // [UIImage imageNamed:@"pages.bundle/1.jpg"];
    NSInteger kCount = 4;
    for (int i = 1; i <= kCount; i++) {
        NSString *name = [NSString stringWithFormat:@"UploadFile%d",i];
        UIImage *image = [UIImage imageNamed:name];
        
        UIImageView *imageView=[[UIImageView alloc]init];
        imageView.image=image;
        CGFloat x = (i-1)*scrol.frame.size.width;
        imageView.frame = CGRectMake(x,0, scrolWidth, scrolHeight);
        [scrol addSubview:imageView];
    }
    //设置滚动范围
    scrol.contentSize=CGSizeMake(kCount * scrolWidth, 0);
    //隐藏水平滚动条
    scrol.showsHorizontalScrollIndicator=NO;
    //设置分页
    scrol.pagingEnabled=YES;
    //添加pagecontrol
    UIPageControl *pageControl=[[UIPageControl alloc]init];
    pageControl.bounds=CGRectMake(0, 0, 150, 50);
    pageControl.center=CGPointMake(scrolWidth*0.5, scrolHeight - 100);
    //设置页数
    pageControl.numberOfPages = kCount;
    //当前选中页码
    pageControl.currentPageIndicatorTintColor=[UIColor grayColor];
    //其他页码
    pageControl.pageIndicatorTintColor=[UIColor blackColor];
    
    [pageControl addTarget:self action:@selector(pageChange) forControlEvents:UIControlEventValueChanged];
    //添加到控制器view上
    [self.view addSubview:pageControl];
    self.pageControl = pageControl;
    //设置代理
    scrol.delegate=self;
    //弹簧效果
    scrol.bounces=NO;

}

pragma mark -- Action

-(void)pageChange{
    int page = (int)self.pageControl.currentPage;
    CGFloat offSetX= page *self.pageControl.frame.size.width;
    [UIView beginAnimations:nil context:nil];
    self.scrol.contentOffset = CGPointMake(offSetX, 0);
    [UIView commitAnimations];
}

pragma mark -- UIScrollViewDelegate

//滚动代理 scroll减速完毕调用

-(void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView{
    //获取滚动位置
    //页码
    int pageNo= scrollView.contentOffset.x/scrollView.frame.size.width;
    self.pageControl.currentPage=pageNo;
}

总结：
1.主要属性scrol.contentSize，设置滚动范围，而scrol.frame是可视范围

2.如果要监听分页操作要控制器充当pagecontrol的代理

3.scrollViewDidEndDecelerating，scroll减速完毕调用，也就是说当用户手松开的那一刻

摘自：https://blog.csdn.net/cooljune/article/details/18952795