The scroll view (UIScrollView) allows you to seamlessly switch between left and right images, and automatically play back images in reverse order.

The scroll view (UIScrollView) allows you to seamlessly switch between left and right images, and automatically play back images in reverse order.

//// LoopView. h // Test_LoopScrollView /// Created by lanouhn on 14-8-30. // Copyright (c) 2014 vaercly@163.com Chen conglei. all rights reserved. // # import
 
  
@ Interface LoopView: UIView @ property (nonatomic, retain) UIScrollView * scrollView; @ property (nonatomic, retain) UIPageControl * pageControl; @ end // LoopView. m // Test_LoopScrollView /// Created by lanouhn on 14-8-30. // Copyright (c) 2014 vaercly@163.com Chen conglei. all rights reserved. // # import "LoopView. h "@ implementation LoopView-(id) initWithFrame :( CGRect) frame {self = [super initWithFrame: frame]; if (self) {// Initialization code [self setupScrollView]; [self setupPageControl];} return self;}-(void) setupScrollView {self. scrollView = [[UIScrollView alloc] initWithFrame: [UIScreen mainScreen]. bounds]; _ scrollView. tag = 200; _ scrollView. contentSize = CGSizeMake (320*7, [UIScreen mainScreen]. bounds. size. height); // [_ scrollView scrollRectToVisible: CGRectMake (320,0, 320, [UIScreen mainScreen]. bounds. size. height) animated: NO]; [_ scrollView setContentOffset: CGPointMake (320, 0) animated: NO]; _ scrollView. showsHorizontalScrollIndicator = NO; _ scrollView. pagingEnabled = YES; [self addSubview: _ scrollView]; [_ scrollView release]; for (int I = 0; I <7; I ++) {UIImageView * imageView = [[UIImageView alloc] initWithFrame: CGRectMake (320 * I, 0,320, [UIScreen mainScreen]. bounds. size. height)]; if (I = 0) {imageView. image = [UIImage imageNamed: @ "girl_5.jpg"];} else if (I = 6) {imageView. image = [UIImage imageNamed: @ "girl_1.jpg"];} else {imageView. image = [UIImage imageWithContentsOfFile: [[NSBundle mainBundle] pathForResource: [NSString stringWithFormat: @ "girl _ % d", I] ofType: @ "jpg"];} [_ scrollView addSubview: imageView]; [imageView release] ;}}- (void) setupPageControl {self. pageControl = [[UIPageControl alloc] initWithFrame: CGRectMake (10, [UIScreen mainScreen]. bounds. size. height-40,300, 20)]; _ pageControl. tag = 100; _ pageControl. numberOfPages = 5; _ pageControl. currentPage = 0; _ pageControl. pageIndicatorTintColor = [UIColor grayColor]; _ pageControl. currentPageIndicatorTintColor = [UIColor orangeColor]; [self addSubview: _ pageControl]; [_ pageControl release];}-(void) dealloc {self. scrollView = nil; self. pageControl = nil; [super dealloc];}/* // Only override drawRect: if you perform custom drawing. // An empty implementation adversely affects performance during animation. -(void) drawRect :( CGRect) rect {// Drawing code} */@ end // RootViewController. m // Test_LoopScrollView /// Created by lanouhn on 14-8-30. // Copyright (c) 2014 vaercly@163.com Chen conglei. all rights reserved. // # import "RootViewController. h "# import" LoopView. h "@ interface RootViewController ()
  
   
{BOOL _ isOrder;} @ end @ implementation RootViewController-(id) initWithNibName :( NSString *) nibNameOrNil bundle :( NSBundle *) handle {self = [super initWithNibName: bundle: role]; if (self) {// Custom initialization _ isOrder = YES; [NSTimer scheduledTimerWithTimeInterval: 1 target: self selector: @ selector (changePage) userInfo: nil repeats: YES];} return self;}-(void) loadView {LoopView * loopView = [[LoopView alloc] initWithFrame: [UIScreen mainScreen]. bounds]; loopView. backgroundColor = [UIColor grayColor]; self. view = loopView; [loopView release];}-(void) viewDidLoad {[super viewDidLoad]; // Do any additional setup after loading the view. loopView * loopView = (LoopView *) self. view; loopView. scrollView. delegate = self; [loopView. pageControl addTarget: self action: @ selec Tor (handlePageControl :) forControlEvents: UIControlEventValueChanged];} (void) scrollViewDidEndDecelerating :( UIScrollView *) scrollView {UIPageControl * pageControl = (UIPageControl *) [self. view viewWithTag: 100]; int currentPage = scrollView. contentOffset. x/320; if (currentPage = 0) {// [scrollView scrollRectToVisible: CGRectMake (320*5, 0,320, [UIScreen mainScreen]. bounds. size. height) animated: N O]; [scrollView setContentOffset: CGPointMake (320*5, 0) animated: NO]; pageControl. currentPage = 4;} else if (currentPage = 6) {// [scrollView scrollRectToVisible: CGRectMake (320, 0,320, [UIScreen mainScreen]. bounds. size. height) animated: NO]; [scrollView setContentOffset: CGPointMake (320, 0) animated: NO]; pageControl. currentPage = 0;} else {pageControl. currentPage = currentPage-1 ;}}- (void) h AndlePageControl :( UIPageControl *) pageControl {NSLog (@ "% d", pageControl. currentPage); UIScrollView * scrollView = (UIScrollView *) [self. view viewWithTag: 200]; // [scrollView scrollRectToVisible: CGRectMake (320 * (pageControl. currentPage + 1), 0,320, [UIScreen mainScreen]. bounds. size. height) animated: NO]; [scrollView setContentOffset: CGPointMake (320 * (pageControl. currentPage + 1), 0) animated: YES];}-( Void) changePage {// single-order edition/* LoopView * loopView = (LoopView *) self. view; int page = loopView. pageControl. currentPage; page ++; page = page> 4? 0: page; loopView. pageControl. currentPage = page; // [loopView. scrollView scrollRectToVisible: CGRectMake (320 * (page + 1), 0,320, [UIScreen mainScreen]. bounds. size. height) animated: NO]; if (page) {[loopView. scrollView setContentOffset: CGPointMake (320 * (page + 1), 0) animated: YES];} else {[loopView. scrollView setContentOffset: CGPointMake (320 * (page + 1), 0) animated: NO];} * // double-order LoopView * LoopView = (LoopView *) self. view; int page = loopView. pageControl. currentPage; if (_ isOrder) {page ++; page = page> 4? 0: page; if (! Page) {_ isOrder = NO; page = 3 ;}} else {page --; page = page <0? 0: page; if (! Page) {_ isOrder = YES; page = 0 ;}} loopView. pageControl. currentPage = page; [loopView. scrollView setContentOffset: CGPointMake (320 * (page + 1), 0) animated: YES];}-(void) didReceiveMemoryWarning {[super didreceivemorywarning]; // Dispose of any resources that can be recreated .} /* # pragma mark-Navigation // In a storyboard-based application, you will often want to do a little preparation before navigation-(void) prepareForSegue :( UIStoryboardSegue *) segue sender :( id) sender {// Get the new view controller using [segue destinationViewController]. // Pass the selected object to the new view controller .} * // @ end