Auto-scroll: automatically displays the next image. Scroll: automatically displays the image.

Auto-scroll: automatically displays the next image. Scroll: automatically displays the image.

:

Images and small dots are automatically switched every 1 s.

 

Engineering Drawing:

Code:

RootViewController. h

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

 

RootViewController. m

-(Void) viewDidLoad {[super viewDidLoad]; // Do any additional setup after loading the view. self. title = @ "auto scroll, auto show next image"; // automatically switch to the showtimer page = [nst1_scheduledtimerwithtimeinterval: 1.0f target: self selector: @ selector (changePageNumber) userInfo: nil repeats: YES]; // Add the scroll bar [self addScrollView]; // Add the sliding dot [self addPageControl];} # pragma-mark-functions // Add the scroll bar-(void) addScrollView {imageScrollView = [[Export alloc] failed: 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] ;}// Add a white slider-(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 ;}}