新版无限轮播视图，2个imageView完成(不依赖任何三方库)

笔者最新改写的无限轮播视图，完全不依赖任何三方库,2个imageView实现无限轮播。

特点：

1.支持图片缓存到本地，亦支持一键清除缓存。

2.超级轻量，没有任何第三方框架参合，占用内存极小

3.高度自定义，支持修改pageControll的显示图片及显示位置

4.图片展示模式多样性，支持轮播展示与渐入渐出模式展示

5.支持自动滚动

6.创建方式多样，支持代码及storyboard创建

7.支持显示图片简介，具体见GitHub效果图

代码实现：

.h

//
//  WYScrollView.h
//  WYScrollView
//
//  Created by jacke－xu on 16/6/7.
//  Copyright © 2016年 jacke－xu. All rights reserved.
//

#import <UIKit/UIKit.h>

@class WYScrollView;

//block方式监控图片的点击事件
typedef void(^ClickBlock)(NSInteger index);

//pageControl的显示位置
typedef enum {

    PositionNone,           //默认值 == PositionBottomCenter
    PositionHide,           //隐藏
    PositionTopCenter,      //中上
    PositionBottomLeft,     //左下
    PositionBottomCenter,   //中下
    PositionBottomRight     //右下

} PageControlPosition;

//图片切换的方式
typedef enum {

    ChangeModeDefault,  //轮播滚动
    ChangeModeFade      //淡入淡出

}ChangeMode;

//代理方式监控图片的点击事件
@protocol WYScrollViewDelegate <NSObject>

/**
 *  该方法用来处理图片的点击，会返回图片在数组中的索引
 *  代理与block二选一即可，若两者都实现，block的优先级高
 *
 *  @param scrollView 控件本身
 *  @param index        图片索引
 */

- (void)scrollView:(WYScrollView *)scrollView clickImageAtIndex:(NSInteger)index;

@end

/**
 *  说明：要想正常使用，图片数组imageArray必须设置
 *  控件的frame必须设置，xib\sb创建的可不设置
 *  其他属性都有默认值，可不设置
 */
@interface WYScrollView : UIView

/*
 这里没有提供修改占位图片的接口，如果需要修改，可直接到.m文件中
 搜索"WYScrollView"替换为你想要显示的图片名称，或者将原有的占位
 图片删除并修改你想要显示的图片名称为"WYScrollView"。
 不需要占位图片的请将[UIImage imageNamed:@"WYScrollView"]
 修改为[UIImage new]或[[UIImage alloc] init]
 */

#pragma mark 属性

/**
 *  设置图片切换的模式，默认为ChangeModeDefault
 */
@property (nonatomic, assign) ChangeMode changeMode;

/**
 *  设置分页控件位置，默认为PositionBottomCenter
 *  只有一张图片时，pageControl隐藏
 */
@property (nonatomic, assign) PageControlPosition pagePosition;

/**
 *  轮播的图片数组，可以是本地图片（UIImage，不能是图片名称），也可以是网络路径
 */
@property (nonatomic, strong) NSArray *imageArray;

/**
 *  图片描述的字符串数组，应与图片顺序对应
 *
 *  图片描述控件默认是隐藏的
 *  设置该属性，控件会显示
 *  设置为nil或空数组，控件会隐藏
 */
@property (nonatomic, strong) NSArray *describeArray;

/**
 *  每一页停留时间，默认为5s，最少2s
 *  当设置的值小于2s时，则为默认值
 */
@property (nonatomic, assign) NSTimeInterval time;

/**
 *  点击图片后要执行的操作，会返回图片在数组中的索引
 */
@property (nonatomic, copy) ClickBlock imageClickBlock;

/**
 *  代理，用来处理图片的点击
 */
@property (nonatomic, weak) id<WYScrollViewDelegate> delegate;

#pragma mark 构造方法
/**
 *  构造方法
 *
 *  @param imageArray 图片数组
 *  @param describeArray 图片描述数组
 *
 */

- (instancetype)initWithFrame:(CGRect)frame imageArray:(NSArray *)imageArray;

- (instancetype)initWithImageArray:(NSArray *)imageArray imageClickBlock:(void(^)(NSInteger index))imageClickBlock;

+ (instancetype)scrollViewWithImageArray:(NSArray *)imageArray describeArray:(NSArray *)describeArray;

#pragma mark 方法

/**
 *  开启定时器
 *  默认已开启，调用该方法会重新开启
 */
- (void)startTimer;

/**
 *  停止定时器
 *  停止后，如果手动滚动图片，定时器会检查滚动前的定时器状态，判断是否需要重启定时器
 */
- (void)stopTimer;

/**
 *  设置分页控件指示器的图片
 *  两个图片必须同时设置，否则设置无效
 *  不设置则为系统默认
 *
 *  @param pageImage    其他页码的图片
 *  @param currentImage 当前页码的图片
 */
- (void)setPageImage:(UIImage *)image andCurrentPageImage:(UIImage *)currentImage;

/**
 *  设置分页控件指示器的颜色
 *  不设置则为系统默认
 *
 *  @param color    其他页码的颜色
 *  @param currentColor 当前页码的颜色
 */
- (void)setPageColor:(UIColor *)color andCurrentPageColor:(UIColor *)currentColor;

/**
 *  修改图片描述控件的部分属性，不需要修改的传nil
 *
 *  @param color   字体颜色，默认为[UIColor whiteColor]
 *  @param font    字体，默认为[UIFont systemFontOfSize:13]
 *  @param bgColor 背景颜色，默认为[UIColor colorWithWhite:0 alpha:0.5]
 */
- (void)setDescribeTextColor:(UIColor *)color font:(UIFont *)font bgColor:(UIColor *)bgColor;

/**
 *  清除沙盒中的图片缓存
 */
- (void)clearDiskCache;

@end

.m

//
//  WYScrollView.m
//  WYScrollView
//
//  Created by jacke－xu on 16/6/7.
//  Copyright © 2016年 jacke－xu. All rights reserved.
//

#import "WYScrollView.h"

#define DEFAULTTIME 5
#define HORMARGIN 10
#define VERMARGIN 5
#define DES_LABEL_H 20

@interface WYScrollView ()<UIScrollViewDelegate>

//轮播的图片数组
@property (nonatomic, strong) NSMutableArray *images;
//图片描述控件，默认在底部
@property (nonatomic, strong) UILabel *describeLabel;
//滚动视图
@property (nonatomic, strong) UIScrollView *scrollView;
//分页控件
@property (nonatomic, strong) UIPageControl *pageControl;
//当前显示的imageView
@property (nonatomic, strong) UIImageView *currImageView;
//滚动显示的imageView
@property (nonatomic, strong) UIImageView *otherImageView;
//当前显示图片的索引
@property (nonatomic, assign) NSInteger currIndex;
//将要显示图片的索引
@property (nonatomic, assign) NSInteger nextIndex;
//pageControl图片大小
@property (nonatomic, assign) CGSize pageImageSize;
//定时器
@property (nonatomic, strong) NSTimer *timer;
//是否启用了定时器
@property (nonatomic, assign) BOOL isTimer;
//任务队列
@property (nonatomic, strong) NSOperationQueue *queue;

@end

@implementation WYScrollView

#pragma mark- 初始化方法
//创建用来缓存图片的文件夹
+ (void)initialize {

    NSString *cache = [[NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES) lastObject] stringByAppendingPathComponent:@"WYScrollView"];
    BOOL isDir = NO;
    BOOL isExists = [[NSFileManager defaultManager] fileExistsAtPath:cache isDirectory:&isDir];
    if (!isExists || !isDir) {
        [[NSFileManager defaultManager] createDirectoryAtPath:cache withIntermediateDirectories:YES attributes:nil error:nil];
    }
}

#pragma mark- frame相关
- (CGFloat)height {
    return self.scrollView.frame.size.height;
}

- (CGFloat)width {
    return self.scrollView.frame.size.width;
}

#pragma mark- 懒加载
- (NSOperationQueue *)queue {
    if (!_queue) {
        _queue = [[NSOperationQueue alloc] init];
    }
    return _queue;
}

- (UIScrollView *)scrollView {
    if (!_scrollView) {
        _scrollView = [[UIScrollView alloc] init];
        _scrollView.pagingEnabled = YES;
        _scrollView.bounces = NO;
        _scrollView.showsHorizontalScrollIndicator = NO;
        _scrollView.showsVerticalScrollIndicator = NO;
        _scrollView.delegate = self;
        //添加手势监听图片的点击
        [_scrollView addGestureRecognizer:[[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(imageClick)]];
        _currImageView = [[UIImageView alloc] init];
        [_scrollView addSubview:_currImageView];
        _otherImageView = [[UIImageView alloc] init];
        [_scrollView addSubview:_otherImageView];

        self.isTimer = YES;
    }
    return _scrollView;
}

- (UILabel *)describeLabel {

    if (!_describeLabel) {
        _describeLabel = [[UILabel alloc] init];
        _describeLabel.backgroundColor = [UIColor colorWithWhite:0 alpha:0.5];
        _describeLabel.textColor = [UIColor whiteColor];
        _describeLabel.textAlignment = NSTextAlignmentCenter;
        _describeLabel.font = [UIFont systemFontOfSize:13];
        _describeLabel.hidden = YES;
    }
    return _describeLabel;
}

- (UIPageControl *)pageControl {

    if (!_pageControl) {
        _pageControl = [[UIPageControl alloc] init];
        _pageControl.userInteractionEnabled = NO;
    }
    return _pageControl;
}

#pragma mark- 构造方法
- (instancetype)initWithFrame:(CGRect)frame imageArray:(NSArray *)imageArray {

    if (self = [super initWithFrame:frame]) {
        self.imageArray = imageArray;
    }
    return self;
}

- (instancetype)initWithImageArray:(NSArray *)imageArray imageClickBlock:(void(^)(NSInteger index))imageClickBlock {

    if (self = [self initWithFrame:CGRectZero imageArray:imageArray]) {
        self.imageClickBlock = imageClickBlock;
    }
    return self;
}

+ (instancetype)scrollViewWithImageArray:(NSArray *)imageArray describeArray:(NSArray *)describeArray {

    WYScrollView *wyScrollView = [[self alloc] init];
    wyScrollView.imageArray = imageArray;
    wyScrollView.describeArray = describeArray;

    return wyScrollView;
}

#pragma mark- --------设置相关方法--------
#pragma mark 设置控件的frame，并添加子控件
- (void)setFrame:(CGRect)frame {
    [super setFrame:frame];
    [self addSubview:self.scrollView];
    [self addSubview:self.describeLabel];
    [self addSubview:self.pageControl];
}

#pragma mark 设置图片数组
- (void)setImageArray:(NSArray *)imageArray{
    if (!imageArray.count) return;
    _imageArray = imageArray;
    _images = [NSMutableArray array];

    for (int i = 0; i < imageArray.count; i++) {
        if ([imageArray[i] isKindOfClass:[UIImage class]]) {
            [_images addObject:imageArray[i]];
        } else if ([imageArray[i] isKindOfClass:[NSString class]]){
            //如果是网络图片，则先添加占位图片，下载完成后替换
            [_images addObject:[UIImage imageNamed:@"Placeholder"]];
            [self downloadImages:i];
        }
    }

    //防止在滚动过程中重新给imageArray赋值时报错
    if (_currIndex >= _images.count) _currIndex = _images.count - 1;
    self.currImageView.image = _images[_currIndex];
    self.describeLabel.text = _describeArray[_currIndex];
    self.pageControl.numberOfPages = _images.count;
    [self layoutSubviews];
}

#pragma mark 设置描述数组
- (void)setDescribeArray:(NSArray *)describeArray{
    _describeArray = describeArray;
    if (!describeArray.count) {
        _describeArray = nil;
        self.describeLabel.hidden = YES;
    } else {
        //如果描述的个数与图片个数不一致，则补空字符串
        if (describeArray.count < _images.count) {
            NSMutableArray *describes = [NSMutableArray arrayWithArray:describeArray];
            for (NSInteger i = describeArray.count; i < _images.count; i++) {
                [describes addObject:@""];
            }
            _describeArray = describes;
        }
        self.describeLabel.hidden = NO;
        _describeLabel.text = _describeArray[_currIndex];
    }
    //重新计算pageControl的位置
    self.pagePosition = self.pagePosition;
}

#pragma mark 设置scrollView的contentSize
- (void)setScrollViewContentSize {
    if (_images.count > 1) {
        self.scrollView.contentSize = CGSizeMake(self.width * 5, 0);
        self.scrollView.contentOffset = CGPointMake(self.width * 2, 0);
        self.currImageView.frame = CGRectMake(self.width * 2, 0, self.width, self.height);
        if (_changeMode == ChangeModeFade) {
            //淡入淡出模式，两个imageView都在同一位置，改变透明度就可以了
            _currImageView.frame = CGRectMake(0, 0, self.width, self.height);
            _otherImageView.frame = self.currImageView.frame;
            _otherImageView.alpha = 0;
            [self insertSubview:self.currImageView atIndex:0];
            [self insertSubview:self.otherImageView atIndex:1];
        }
        [self startTimer];
    } else {
        //只有一张图片时，scrollview不可滚动，且关闭定时器
        self.scrollView.contentSize = CGSizeZero;
        self.scrollView.contentOffset = CGPointZero;
        self.currImageView.frame = CGRectMake(0, 0, self.width, self.height);
        [self stopTimer];
    }
}

#pragma mark 设置图片描述控件
- (void)setDescribeTextColor:(UIColor *)color font:(UIFont *)font bgColor:(UIColor *)bgColor {
    if (color) self.describeLabel.textColor = color;
    if (font) self.describeLabel.font = font;
    if (bgColor) self.describeLabel.backgroundColor = bgColor;
}

#pragma mark 设置pageControl的指示器图片
- (void)setPageImage:(UIImage *)image andCurrentPageImage:(UIImage *)currentImage {
    if (!image || !currentImage) return;
    self.pageImageSize = image.size;
    [self.pageControl setValue:currentImage forKey:@"_currentPageImage"];
    [self.pageControl setValue:image forKey:@"_pageImage"];
}

#pragma mark 设置pageControl的指示器颜色
- (void)setPageColor:(UIColor *)color andCurrentPageColor:(UIColor *)currentColor {
    _pageControl.pageIndicatorTintColor = color;
    _pageControl.currentPageIndicatorTintColor = currentColor;
}

#pragma mark 设置pageControl的位置
- (void)setPagePosition:(PageControlPosition)pagePosition {
    _pagePosition = pagePosition;
    _pageControl.hidden = (_pagePosition == PositionHide) || (_imageArray.count == 1);
    if (_pageControl.hidden) return;

    CGSize size;
    if (!_pageImageSize.width) {//没有设置图片，系统原有样式
        size = [_pageControl sizeForNumberOfPages:_pageControl.numberOfPages];
        size.height = 8;
    } else {//设置图片了
        size = CGSizeMake(_pageImageSize.width * (_pageControl.numberOfPages * 2 - 1), _pageImageSize.height);
    }
    _pageControl.frame = CGRectMake(0, 0, size.width, size.height);

    CGFloat centerY = self.height - size.height * 0.5 - VERMARGIN - (_describeLabel.hidden?0: DES_LABEL_H);
    CGFloat pointY = self.height - size.height - VERMARGIN - (_describeLabel.hidden?0: DES_LABEL_H);

    if (_pagePosition == PositionNone || _pagePosition == PositionBottomCenter)
        _pageControl.center = CGPointMake(self.width * 0.5, centerY);
    else if (_pagePosition == PositionTopCenter)
        _pageControl.center = CGPointMake(self.width * 0.5, size.height * 0.5 + VERMARGIN);
    else if (_pagePosition == PositionBottomLeft)
        _pageControl.frame = CGRectMake(HORMARGIN, pointY, size.width, size.height);
    else
        _pageControl.frame = CGRectMake(self.width - HORMARGIN - size.width, pointY, size.width, size.height);
}

#pragma mark 设置定时器时间
- (void)setTime:(NSTimeInterval)time {
    _time = time;
    [self startTimer];
}

#pragma mark- --------定时器相关方法--------
- (void)startTimer {
    //如果只有一张图片，则直接返回，不开启定时器
    if (_images.count <= 1) return;
    //如果定时器已开启，先停止再重新开启
    if (self.timer) [self stopTimer];
    self.timer = [NSTimer timerWithTimeInterval:_time < 2? DEFAULTTIME: _time target:self selector:@selector(nextPage) userInfo:nil repeats:YES];
    [[NSRunLoop currentRunLoop] addTimer:self.timer forMode:NSRunLoopCommonModes];

    self.isTimer = YES;
}

- (void)stopTimer {
    self.isTimer = NO;
    [self.timer invalidate];
    self.timer = nil;
}

- (void)nextPage {
    if (_changeMode == ChangeModeFade) {
        //淡入淡出模式，不需要修改scrollview偏移量，改变两张图片的透明度即可
        self.nextIndex = (self.currIndex + 1) % _images.count;
        self.otherImageView.image = _images[_nextIndex];

        [UIView animateWithDuration:1.2 animations:^{
            self.currImageView.alpha = 0;
            self.otherImageView.alpha = 1;
            self.pageControl.currentPage = _nextIndex;
        } completion:^(BOOL finished) {
            [self changeToNext];
        }];

    } else [self.scrollView setContentOffset:CGPointMake(self.width * 3, 0) animated:YES];
}

#pragma mark- -----------其它-----------
#pragma mark 布局子控件
- (void)layoutSubviews {
    [super layoutSubviews];
    //有导航控制器时，会默认在scrollview上方添加64的内边距，这里强制设置为0
    _scrollView.contentInset = UIEdgeInsetsZero;

    _scrollView.frame = self.bounds;
    _describeLabel.frame = CGRectMake(0, self.height - DES_LABEL_H, self.width, DES_LABEL_H);
    //重新计算pageControl的位置
    self.pagePosition = self.pagePosition;
    [self setScrollViewContentSize];
}

#pragma mark 图片点击事件
- (void)imageClick {
    if (self.imageClickBlock) {
        self.imageClickBlock(self.currIndex);
    } else if ([_delegate respondsToSelector:@selector(scrollView:clickImageAtIndex:)]){
        [_delegate scrollView:self clickImageAtIndex:self.currIndex];
    }
}

#pragma mark 下载网络图片
- (void)downloadImages:(int)index {
    NSString *key = _imageArray[index];
    //从沙盒中取图片
    NSString *path = [[[NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES) lastObject] stringByAppendingPathComponent:@"WYScrollView"] stringByAppendingPathComponent:[key lastPathComponent]];
    NSData *data = [NSData dataWithContentsOfFile:path];
    if (data) {
        _images[index] = [UIImage imageWithData:data];
        return;
    }else {
        //如果沙盒里的图片有不需要显示的，则直接清空沙盒，节约资源
        [self clearDiskCache];
    }
    //下载图片
    NSBlockOperation *download = [NSBlockOperation blockOperationWithBlock:^{
        NSData *data = [NSData dataWithContentsOfURL:[NSURL URLWithString:key]];
        if (!data) return;
        UIImage *image = [UIImage imageWithData:data];
        //取到的data有可能不是图片
        if (image) {
            self.images[index] = image;
            //如果下载的图片为当前要显示的图片，直接到主线程给imageView赋值，否则要等到下一轮才会显示
            if (_currIndex == index) [_currImageView performSelectorOnMainThread:@selector(setImage:) withObject:image waitUntilDone:NO];
            [data writeToFile:path atomically:YES];
        }
    }];
    [self.queue addOperation:download];
}

#pragma mark 清除沙盒中的图片缓存
- (void)clearDiskCache {
    NSString *cache = [[NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES) lastObject] stringByAppendingPathComponent:@"WYScrollView"];
    NSArray *contents = [[NSFileManager defaultManager] contentsOfDirectoryAtPath:cache error:NULL];
    for (NSString *fileName in contents) {
        [[NSFileManager defaultManager] removeItemAtPath:[cache stringByAppendingPathComponent:fileName] error:nil];
    }
}

#pragma mark 当图片滚动过半时就修改当前页码
- (void)changeCurrentPageWithOffset:(CGFloat)offsetX {
    if (offsetX < self.width * 1.5) {
        NSInteger index = self.currIndex - 1;
        if (index < 0) index = self.images.count - 1;
        _pageControl.currentPage = index;
    } else if (offsetX > self.width * 2.5){
        _pageControl.currentPage = (self.currIndex + 1) % self.images.count;
    } else {
        _pageControl.currentPage = self.currIndex;
    }
}

#pragma mark- --------UIScrollViewDelegate--------
- (void)scrollViewDidScroll:(UIScrollView *)scrollView {
    if (CGSizeEqualToSize(CGSizeZero, scrollView.contentSize)) return;
    CGFloat offsetX = scrollView.contentOffset.x;
    //滚动过程中改变pageControl的当前页码
    [self changeCurrentPageWithOffset:offsetX];

    //向右滚动
    if (offsetX < self.width * 2) {
        if (_changeMode == ChangeModeFade) {
            self.currImageView.alpha = offsetX / self.width - 1;
            self.otherImageView.alpha = 2 - offsetX / self.width;
        } else self.otherImageView.frame = CGRectMake(self.width, 0, self.width, self.height);

        self.nextIndex = self.currIndex - 1;
        if (self.nextIndex < 0) self.nextIndex = _images.count - 1;
        if (offsetX <= self.width) [self changeToNext];

        //向左滚动
    } else if (offsetX > self.width * 2){
        if (_changeMode == ChangeModeFade) {
            self.otherImageView.alpha = offsetX / self.width - 2;
            self.currImageView.alpha = 3 - offsetX / self.width;
        } else self.otherImageView.frame = CGRectMake(CGRectGetMaxX(_currImageView.frame), 0, self.width, self.height);

        self.nextIndex = (self.currIndex + 1) % _images.count;
        if (offsetX >= self.width * 3) [self changeToNext];
    }
    self.otherImageView.image = self.images[self.nextIndex];
}

- (void)changeToNext {
    if (_changeMode == ChangeModeFade) {
        self.currImageView.alpha = 1;
        self.otherImageView.alpha = 0;
    }
    //切换到下一张图片
    self.currImageView.image = self.otherImageView.image;
    self.scrollView.contentOffset = CGPointMake(self.width * 2, 0);
    self.currIndex = self.nextIndex;
    self.pageControl.currentPage = self.currIndex;
    self.describeLabel.text = self.describeArray[self.currIndex];
}

- (void)scrollViewWillBeginDragging:(UIScrollView *)scrollView {

    if(self.isTimer == YES) {

        [self stopTimer];
        self.isTimer = YES;

    }else {

        [self stopTimer];
    }
}

- (void)scrollViewDidEndDragging:(UIScrollView *)scrollView willDecelerate:(BOOL)decelerate{

    if(self.isTimer == YES) {

        [self startTimer];
    }else {

        [self stopTimer];
    }
}

/*
// Only override drawRect: if you perform custom drawing.
// An empty implementation adversely affects performance during animation.
- (void)drawRect:(CGRect)rect {
    // Drawing code
}
*/

@end

调用方法 ：详见代码

//
//  ViewController.m
//  WYScrollView
//
//  Created by jacke－xu on 16/6/7.
//  Copyright © 2016年 jacke－xu. All rights reserved.
//

#import "ViewController.h"
#import "WYScrollView.h"

@interface ViewController ()<WYScrollViewDelegate>

@property (nonatomic, strong)WYScrollView *scrollView;
@property (weak, nonatomic) IBOutlet WYScrollView *scrollView1;

@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.
    self.title = @"测试";
    self.view.backgroundColor = [UIColor whiteColor];

    //网络图片
    NSArray *arr2 = @[@"http://hiphotos.baidu.com/praisejesus/pic/item/e8df7df89fac869eb68f316d.jpg", @"http://pic39.nipic.com/20140226/18071023_162553457000_2.jpg", @"http://file27.mafengwo.net/M00/B2/12/wKgB6lO0ahWAMhL8AAV1yBFJDJw20.jpeg"];

    //既有本地图片也有网络图片
    NSArray *arr3 = @[@"http://pic39.nipic.com/20140226/18071023_162553457000_2.jpg", [UIImage imageNamed:@"2.jpg"], @"http://hiphotos.baidu.com/praisejesus/pic/item/e8df7df89fac869eb68f316d.jpg", [UIImage imageNamed:@"1.jpg"]];
    NSArray *describeArray = @[@"这是第一张图片的描述", @"这是第二张图片的描述", @"这是第三张图片的描述", @"这是第四张图片的描述"];

    /**
     *  通过代码创建
     */
    self.scrollView = [WYScrollView scrollViewWithImageArray:arr3 describeArray:describeArray];

    //设置frame
    self.scrollView.frame = CGRectMake(0, 100, [UIScreen mainScreen].bounds.size.width, 180);

    //用代理处理图片点击
    self.scrollView.delegate = self;

    //设置每张图片的停留时间，默认值为5s，最少为2s
    _scrollView.time = 3;

    //设置分页控件的图片,不设置则为系统默认
    [_scrollView setPageImage:[UIImage imageNamed:@"other"] andCurrentPageImage:[UIImage imageNamed:@"current"]];

    //设置分页控件的位置，默认为PositionBottomCenter
    _scrollView.pagePosition = PositionBottomRight;

    /**
     *  修改图片描述控件的外观，不需要修改的传nil
     *
     *  参数一 字体颜色，默认为白色
     *  参数二 字体，默认为13号字体
     *  参数三 背景颜色，默认为黑色半透明
     */
    UIColor *bgColor = [[UIColor blueColor] colorWithAlphaComponent:0.5];
    UIFont *font = [UIFont systemFontOfSize:15];
    UIColor *textColor = [UIColor greenColor];
    [_scrollView setDescribeTextColor:textColor font:font bgColor:bgColor];

    [self.view addSubview:_scrollView];

    /**
     *  通过storyboard创建的轮播控件
     */
    _scrollView1.imageArray = arr2;
    //设置分页控件指示器的颜色
    [_scrollView1 setPageColor:[UIColor blueColor] andCurrentPageColor:[UIColor redColor]];
    //设置图片切换的方式
    _scrollView1.changeMode = ChangeModeFade;
    //用block处理图片点击事件
    _scrollView1.imageClickBlock = ^(NSInteger index){
        NSLog(@"点击了第%ld张图片", index);
    };
    _scrollView1.time = 3;
}

#pragma mark XRCarouselViewDelegate

- (void)scrollView:(WYScrollView *)carouselView clickImageAtIndex:(NSInteger)index {
    NSLog(@"点击了第%ld张图片", index);
}

- (IBAction)start:(id)sender {

    [_scrollView startTimer];
}

- (IBAction)stop:(id)sender {

    [_scrollView stopTimer];
}

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

@end

代码下载：GITHub： https://github.com/Jacke-xu/WYScrollView