#import <UIKit/UIKit.h>@interface RootViewController : UIViewController<UIScrollViewDelegate,UIPageViewControllerDelegate>{    UIScrollView *imageScrollView;    UIPageControl *pageControl;    NSInteger changePage;    NSTimer *showtimer;    }@end

- (void)viewDidLoad{    [super viewDidLoad];    // Do any additional setup after loading the view.        self.title=@"自动滚动，自动显示下一个图像";        //自动切换页面    showtimer=[NSTimer scheduledTimerWithTimeInterval:1.0f target:self selector:@selector(changePageNumber) userInfo:nil repeats:YES];    //加滚动条    [self addScrollView];    //加滑动的圆点    [self addPageControl];        }#pragma -mark -functions//加入滚动条-(void)addScrollView {        imageScrollView = [[UIScrollView alloc]initWithFrame:CGRectMake(0, 100, 320, 120)];    [imageScrollView setBackgroundColor:[UIColor redColor]];;    [imageScrollView setContentSize:CGSizeMake(320*4, 120)];    [imageScrollView setBounces:NO];    [imageScrollView setDelegate:self];;    imageScrollView.pagingEnabled = YES;    imageScrollView.showsHorizontalScrollIndicator = NO;    imageScrollView.showsVerticalScrollIndicator=NO;    [self.view addSubview:imageScrollView];        int i = 0;    for ( i = 0; i <4; i++) {        UIImageView *imageView = [[UIImageView alloc]initWithFrame:CGRectMake(320*i, 0, 320, 120)];        imageView.image=[UIImage imageNamed:[NSString stringWithFormat:@"%i.jpg",i]];        imageView.tag = 110 + i;        imageView.userInteractionEnabled=YES;        [imageScrollView addSubview:imageView];    }    }//加入白色的滑动条-(void) addPageControl {    pageControl = [[UIPageControl alloc]initWithFrame:CGRectMake(145, 190, 100, 40)];    pageControl.numberOfPages =4;    pageControl.tag = 101;    pageControl.currentPage = 0;    pageControl.backgroundColor=[UIColor clearColor];    [self.view addSubview:pageControl];}#pragma -mark -UIPageViewControllerDelegate-(void)changePageNumber{    pageControl.currentPage=pageControl.currentPage+1;    if (pageControl.currentPage==3) {        changePage = changePage+1;            }    if (changePage==2) {        pageControl.currentPage=0;        changePage=0;    }        [imageScrollView scrollRectToVisible:CGRectMake(pageControl.currentPage * 320.0, 65.0, 320.0, 218.0) animated:YES];    }-(void) tap: (UITapGestureRecognizer*)sender{    NSLog(@"tap %ld image",(long)pageControl.currentPage);}#pragma -mark -UIScrollViewDelegate-(void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView {    int current = scrollView.contentOffset.x/320;    NSLog(@"current:%d",current);    pageControl.currentPage = current;    if (pageControl.currentPage==3) {        changePage = changePage+1;            }    if (changePage==2) {        pageControl.currentPage=0;        [imageScrollView scrollRectToVisible:CGRectMake(pageControl.currentPage * 320.0, 65.0, 320.0, 218.0) animated:YES];        changePage=0;    }    }