ScollViewpageView

#import "ViewController.h"

#define ImageCount 10
#define SCREEN_WIDTH [UIScreen mainScreen].bounds.size.width
#define SCREEN_HEIGHT [UIScreen mainScreen].bounds.size.height

&＃64;interface ViewController ()
{
    UIScrollView *_scrollView;
    UIImageView *_leftImageView;
    UIImageView *_middleImageView;
    UIImageView *_rightImageView;
    int currentImage;
    
    UIPageControl *_pageControl;
}

&＃64;end

&＃64;implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    
    _scrollView &＃61; [[UIScrollView alloc]initWithFrame:[UIScreen mainScreen].bounds];
    [self.view addSubview:_scrollView];
    
    _scrollView.delegate &＃61; self;
    _scrollView.contentSize &＃61; CGSizeMake(_scrollView.frame.size.width*3, _scrollView.frame.size.height);
    //设置当前scrollView显示中间区域
    _scrollView.contentOffset &＃61; CGPointMake(_scrollView.frame.size.width, 0);
    
    _scrollView.pagingEnabled &＃61; YES;
    
    //添加imageView
    //左
    _leftImageView &＃61; [[UIImageView alloc]initWithFrame:CGRectMake(0, 0, SCREEN_WIDTH, SCREEN_HEIGHT)];
    _leftImageView.contentMode &＃61; UIViewContentModeScaleAspectFill;
    [_scrollView addSubview:_leftImageView];
    //右
    _rightImageView &＃61; [[UIImageView alloc]initWithFrame:CGRectMake(SCREEN_WIDTH*2, 0, SCREEN_WIDTH, SCREEN_HEIGHT)];
    _rightImageView.contentMode &＃61; UIViewContentModeScaleAspectFill;
    [_scrollView addSubview:_rightImageView];
    //中
    _middleImageView &＃61; [[UIImageView alloc]initWithFrame:CGRectMake(SCREEN_WIDTH, 0, SCREEN_WIDTH, SCREEN_HEIGHT)];
    _middleImageView.contentMode &＃61; UIViewContentModeScaleAspectFill;
    [_scrollView addSubview:_middleImageView];
    
    currentImage &＃61; 0;
    
    //初始化pageControl
    _pageControl &＃61; [[UIPageControl alloc]init];
    //根据页数返回pageControl合适的大小
    CGSize size &＃61; [_pageControl sizeForNumberOfPages:ImageCount];
    _pageControl.center &＃61; CGPointMake(SCREEN_WIDTH/2, 580);
    _pageControl.bounds &＃61; CGRectMake(0, 0, size.width, size.height);
//    _pageControl.backgroundColor &＃61; [UIColor whiteColor];
    //设置颜色
    _pageControl.pageIndicatorTintColor &＃61; [UIColor redColor];
    _pageControl.currentPageIndicatorTintColor &＃61; [UIColor grayColor];
    _pageControl.numberOfPages &＃61; ImageCount;
    _pageControl.currentPage &＃61; currentImage;
    [self.view addSubview:_pageControl];
    
    
    [self setImage];
    
    [NSTimer scheduledTimerWithTimeInterval:2.0f target:self selector:&＃64;selector(changeImage) userInfo:nil repeats:YES];
    
}

-(void)changeImage
{
    [UIView beginAnimations:nil context:nil];
    [UIView setAnimationDuration:1.0f];
    _scrollView.contentOffset &＃61; CGPointMake(SCREEN_WIDTH*2, 0);
    [UIView commitAnimations];
    currentImage &＃61; (currentImage&＃43;1)%ImageCount;
    _scrollView.contentOffset &＃61; CGPointMake(SCREEN_WIDTH, 0);
    [self setImage];
}

-(void) setImage
{
     _pageControl.currentPage &＃61; currentImage;
//    加载默认图片
    _leftImageView.image &＃61; [UIImage imageNamed:[NSString stringWithFormat:&＃64;"%d",(ImageCount&＃43;currentImage-1)%ImageCount]];
    _rightImageView.image &＃61; [UIImage imageNamed:[NSString stringWithFormat:&＃64;"%d",(currentImage&＃43;1)%ImageCount]];
    _middleImageView.image &＃61; [UIImage imageNamed:[NSString stringWithFormat:&＃64;"%d",currentImage]];
}

-(void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView
{
    //如果向右滑动
    if (scrollView.contentOffset.x &＃61;&＃61; SCREEN_WIDTH*2) {
        currentImage &＃61; (currentImage&＃43;1)%ImageCount;
        scrollView.contentOffset &＃61; CGPointMake(SCREEN_WIDTH, 0);
        [self setImage];
    }
    //如果向左滑动
    else if(scrollView.contentOffset.x &＃61;&＃61; 0)
    {
        currentImage &＃61; (ImageCount&＃43;currentImage-1)%ImageCount;
        scrollView.contentOffset &＃61; CGPointMake(SCREEN_WIDTH, 0);
        [self setImage];
    }
}