效果图：
代码：
// Created by 余丽丽 on 15/8/11.
#import "ViewController.h"
//scrollView中存放的imageView的个数 #define IMGCOUNT 30
//scrollView图片轮播的时间间隔 #define TIME 1
@interface ViewController ()<UIScrollViewDelegate> //滚动控件 @property (weak,nonatomic)UIScrollView *scrollView;
//页码显示控件 @property (weak,nonatomic)UIPageControl *pageContol;
//定时器 @property (weak,nonatomic)NSTimer * timer;
@end
@implementation ViewController
- (void)viewDidLoad { [super viewDidLoad];
//动态创建UIScrollView //1、动态创建scrollView UIScrollView *scrollView = [[UIScrollView alloc]init]; //2、设置scrollView相关属性 view W375 H667 //设置frame scrollView.frame = CGRectMake(37, 77, 320, 512); //设置滑动条 scrollView.showsHorizontalScrollIndicator=NO; //设置分页 scrollView.pagingEnabled=YES; //设置代理 scrollView.delegate=self;
//设置内容大小
scrollView.contentSize=CGSizeMake(scrollView.frame.size.width*IMGCOUNT, 0);
//3、添加scrollView到view中，同时跟self.scrollView进行绑定 [self.view addSubview:scrollView]; self.scrollView = scrollView;
//动态创建UIImageView //获取主资源包 NSBundle *mainBundle = [NSBundle mainBundle]; //要加载的图片的统一规格 CGFloat imgW = 320; CGFloat imgH = 512; CGFloat imgY = 0; for (int i =0; i<IMGCOUNT; i++) {
UIImageView *imgView =[[UIImageView alloc]init]; //设置image //生成图片名字 NSString *string=[NSString stringWithFormat:@"knockout_%02d",i]; //获取图片路径 NSString *path = [mainBundle pathForResource:string ofType:@"jpg"]; imgView.image = [UIImage imageWithContentsOfFile:path]; //设置frame CGFloat imgX = imgW*i; imgView.frame = CGRectMake(imgX, imgY, imgW, imgH); //添加到scrollview中 [self.scrollView addSubview:imgView]; }
//动态创建一个UIPageControl UIPageControl* pageControl = [[UIPageControl alloc]init]; //设置UIPageControl //设置页数 [pageControl setNumberOfPages:IMGCOUNT]; //设置颜色为蓝色 pageControl.pageIndicatorTintColor = [UIColor blueColor]; //当前页码颜色为红色 pageControl.currentPageIndicatorTintColor = [UIColor redColor]; //设置frame pageControl.frame=CGRectMake(0, 600, 320, 27); //将pageControl添加到view中 [self.view addSubview:pageControl]; //将pageControl与self.pageContol绑定 self.pageContol = pageControl; self.pageContol.currentPage=0;
//4、开启自动轮播 [self starTimer];
}
- (void)didReceiveMemoryWarning { [super didReceiveMemoryWarning]; }
//监听拖动前 -(void)scrollViewWillBeginDragging:(UIScrollView *)scrollView { //停止计时器 [self overTimer]; }
//监听拖动时 -(void)scrollViewDidScroll:(UIScrollView *)scrollView {
//获取scrollView的偏移 CGPoint point = self.scrollView.contentOffset; //获取scrollView的宽度 CGFloat imageH =self.scrollView.frame.size.width; //计算page self.pageContol.currentPage=(point.x+imageH*0.5)/imageH;
}
//监听拖动后 -(void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView { //开启计时器 [self starTimer]; }
//开启计时器 -(void)starTimer { self.timer = [NSTimer scheduledTimerWithTimeInterval:0.02 target:self selector:@selector(nextPage) userInfo:nil repeats:YES];
}
//结束计时器 -(void)overTimer { [self.timer invalidate]; self.timer=nil; }
//轮播到下一页,自动播放才调用 -(void)nextPage { //设置页码 self.pageContol.currentPage = (++self.pageContol.currentPage)%(IMGCOUNT); //图片偏移
CGFloat offX =self.scrollView.frame.size.width*self.pageContol.currentPage; [self.scrollView setContentOffset:CGPointMake(offX, 0) animated:NO];
}
@end
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