iOS-UIScrollView和UIPageControl的综合实力，滚动图，轮播图

本代码主要实现图片之间的切换

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目录结构

代码

ViewController.m文件

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#import "ViewController.h"

@interface ViewController ()
@property(strong,nonatomic)UIScrollView *scrollView;
@property(strong,nonatomic)UIPageControl *pageControl;
//存储图片
@property(strong,nonatomic)UIImageView *firstIamges;
@property(strong,nonatomic)UIImageView *secondImage;
@property(strong,nonatomic)UIImageView *thirdImage;
//存储图片的集合
@property(strong,nonatomic)NSMutableArray *imageArray;
//当前页码
@property(assign,nonatomic)int currentPage;
@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];

    self.scrollView=[[UIScrollView alloc]initWithFrame:CGRectMake(, ,WIDTH , HEIGHT)];
    self.scrollView.contentSize=CGSizeMake(WIDTH*, );
    self.scrollView.pagingEnabled=YES;
    self.scrollView.delegate=self;
    self.scrollView.showsHorizontalScrollIndicator=NO;
    [self.view addSubview:self.scrollView];

    self.pageControl=[[UIPageControl alloc]initWithFrame:CGRectMake(WIDTH/2.7, , WIDTH/, )];

    //设置当前页
    self.pageControl.currentPage=;
    //分页
    self.pageControl.numberOfPages=;
    //指定页码的颜色
    self.pageControl.currentPageIndicatorTintColor=[UIColor redColor];
    self.pageControl.pageIndicatorTintColor=[UIColor blueColor];
    [self.view addSubview:self.pageControl];

    //初始化存储图片的集合
    self.imageArray=[NSMutableArray array];
    for (int i=; i<; i++) {
        UIImage *image=[UIImage imageNamed:[NSString stringWithFormat:@"%d",i]];
        [self.imageArray addObject:image];
    }

    self.firstIamges=[[UIImageView alloc]init];
    self.secondImage=[[UIImageView alloc]init];
    self.thirdImage=[[UIImageView alloc]init];

    //当前页码
    self.currentPage=;
    [self reloadImage];

}
-(void)reloadImage{
    //第一种情况，第一页
    if(self.currentPage==){
        self.firstIamges.image=[self.imageArray lastObject];
        self.secondImage.image=[self.imageArray objectAtIndex:self.currentPage];
        self.thirdImage.image=[self.imageArray objectAtIndex:self.currentPage+];
    }
    //第二种情况 最后一页
    else if(self.currentPage==self.imageArray.count-){
        self.firstIamges.image=[self.imageArray objectAtIndex:self.currentPage-];
        self.secondImage.image=[self.imageArray objectAtIndex:self.currentPage];
        self.thirdImage.image=[self.imageArray objectAtIndex:];
    }
    //中间页
    else{

        self.firstIamges.image=[self.imageArray objectAtIndex:self.currentPage-];
        self.secondImage.image=[self.imageArray objectAtIndex:self.currentPage];
        self.thirdImage.image=[self.imageArray objectAtIndex:self.currentPage+];
    }

    self.firstIamges.frame=CGRectMake(, , WIDTH, );
    self.secondImage.frame=CGRectMake(WIDTH, , WIDTH, );
    self.thirdImage.frame=CGRectMake(WIDTH*, , WIDTH, );

    [self.scrollView addSubview:self.firstIamges];
    [self.scrollView addSubview:self.secondImage];
    [self.scrollView addSubview:self.thirdImage];

    self.scrollView.contentOffset=CGPointMake(WIDTH, );
}

#pragma mark -Scrollview Delegate
//在滚动结束状态换图
-(void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView{
    float x=self.scrollView.contentOffset.x;

    //向左
    if (x<||x==) {
        if (self.currentPage==) {
            self.currentPage=(int)self.imageArray.count-;
        }else{
            self.currentPage--;
        }

    }
        //向右

        if(x>WIDTH*||x==WIDTH*){
            if (self.currentPage==(int)self.imageArray.count-) {
                self.currentPage=;
            }else{
                self.currentPage++;
            }
        }

    self.pageControl.currentPage=self.currentPage;
    [self reloadImage];

}
- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

@end

ViewController.h文件

#import <UIKit/UIKit.h>
#define WIDTH self.view.frame.size.width
#define HEIGHT self.view.frame.size.height
@interface ViewController : UIViewController<UIScrollViewDelegate>

@end

效果图

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