iOS开发--图片轮播

直接上代码了，比较简单。演示下载地址：Demo

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// //  UYViewController.m //  图片轮播器 // //  Created by jiangys on 15/5/23. //  Copyright (c) 2015年 uxiaoyuan. All rights reserved. //   #import "UYViewController.h" #define kImageCount 5   @interface UYViewController ()<UIScrollViewDelegate>   @property (nonatomic,strong) UIScrollView *scrollView; @property (nonatomic,strong) UIPageControl *pageControl;   @property (nonatomic, strong) NSTimer *timer;   @end   @implementation UYViewController   -(UIScrollView *)scrollView {     if (_scrollView==nil) {         //如果为空，创建一个         _scrollView=[[UIScrollView alloc] initWithFrame:CGRectMake(10, 20, 300, 130)];         _scrollView.backgroundColor=[UIColor redColor];                   //取消弹簧效果         _scrollView.bounces=NO;                   // 取消水平滚动条         _scrollView.showsHorizontalScrollIndicator = NO;         _scrollView.showsVerticalScrollIndicator = NO;                   // 要分页         _scrollView.pagingEnabled = YES;                   // contentSize         _scrollView.contentSize = CGSizeMake(kImageCount * _scrollView.bounds.size.width, 0);                   // 设置代理         _scrollView.delegate = self;                   [self.view addSubview:_scrollView];                            }     return _scrollView;   }   - (UIPageControl *)pageControl {     if (_pageControl == nil) {         // 分页控件，本质上和scrollView没有任何关系，是两个独立的控件         _pageControl = [[UIPageControl alloc] init];         // 总页数         _pageControl.numberOfPages = kImageCount;         // 控件尺寸         CGSize size = [_pageControl sizeForNumberOfPages:kImageCount];                   _pageControl.bounds = CGRectMake(0, 0, size.width, size.height);         _pageControl.center = CGPointMake(self.view.center.x, 130);                   // 设置颜色         _pageControl.pageIndicatorTintColor = [UIColor redColor];         _pageControl.currentPageIndicatorTintColor = [UIColor blackColor];                   [self.view addSubview:_pageControl];                   // 添加监听方法         /** 在OC中，绝大多数"控件"，都可以监听UIControlEventValueChanged事件，button除外" */         [_pageControl addTarget:self action:@selector(pageChanged:) forControlEvents:UIControlEventValueChanged];     }     return _pageControl; }   // 分页控件的监听方法 - (void)pageChanged:(UIPageControl *)page {     // 根据页数，调整滚动视图中的图片位置 contentOffset     CGFloat x = page.currentPage * self.scrollView.bounds.size.width;     [self.scrollView setContentOffset:CGPointMake(x, 0) animated:YES]; }   - (void)viewDidLoad {     [super viewDidLoad];     //设置图片     for (int i=0; i<kImageCount; i++) {         NSString *imageName=[NSString stringWithFormat:@"img_%02d",i+1];         UIImage *image=[UIImage imageNamed:imageName];                   UIImageView *imageView=[[UIImageView alloc] initWithFrame:self.scrollView.bounds];         imageView.image=image;                   [self.scrollView addSubview:imageView];     }     //计算imageView     [self.scrollView.subviews enumerateObjectsUsingBlock:^(UIImageView *imageView, NSUInteger idx, BOOL *stop) {         // 调整x => origin => frame         CGRect frame = imageView.frame;         frame.origin.x = idx * frame.size.width;                   imageView.frame = frame;     }];           // 分页初始页数为0     self.pageControl.currentPage = 0;           // 启动时钟     [self startTimer];       }   - (void)startTimer {     self.timer = [NSTimer timerWithTimeInterval:2.0 target:self selector:@selector(updateTimer) userInfo:nil repeats:YES];     // 添加到运行循环     [[NSRunLoop currentRunLoop] addTimer:self.timer forMode:NSRunLoopCommonModes]; }   - (void)updateTimer {     // 页号发生变化     // (当前的页数 + 1) % 总页数     int page = (self.pageControl.currentPage + 1) % kImageCount;     self.pageControl.currentPage = page;       // 调用监听方法，让滚动视图滚动     [self pageChanged:self.pageControl]; }   - (void)didReceiveMemoryWarning {     [super didReceiveMemoryWarning];     // Dispose of any resources that can be recreated.s       }       #pragma mark - ScrollView的代理方法 // 滚动视图停下来，修改页面控件的小点（页数） - (void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView {     // 计算页数     int page = scrollView.contentOffset.x / scrollView.bounds.size.width;           self.pageControl.currentPage = page; }   /**  修改时钟所在的运行循环的模式后，抓不住图片     解决方法：抓住图片时，停止时钟，送售后，开启时钟  */ - (void)scrollViewWillBeginDragging:(UIScrollView *)scrollView {     // 停止时钟，停止之后就不能再使用，如果要启用时钟，需要重新实例化     [self.timer invalidate]; }   - (void)scrollViewDidEndDragging:(UIScrollView *)scrollView willDecelerate:(BOOL)decelerate {     [self startTimer]; }     @end