UIScrollview之无限循环滚动
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在UIScorllView控件中放置其他的控件，通过控制contentSize之后这些图片就可以滚动，要实现循环滚动的方法是在第一张前面放置的是最后一张图片，在最后一张后面放置第一张的图片，假如你有n张图片，实际上在UIScorllView中有n+2张图片，你有3张图片，只要使用5个UIImageView依次存放：图片3，图片1，图片2，图片3，图片1。当从图片1滚动到图片3时由于最后一张是图片1就给用户一种无限循环的感觉，当这张图完全显示后我们迅速将UIScrollView的contentOffset设置到第二个UIImageView，也就是图片1，接着用户可以继续向后滚动。当然向前滚动原理完全一样，当滚动到第一张图片（图片3）就迅速设置UIScrollView的contentOffset显示第3张图（图片3）。
但是这样的做法是会比较消耗性能，我们可以进一步经行优化，只要创建3个UIimageView就可以实现无限循环滚动了。只要一直保持显示中间的UIImageView，滚动时动态更改三个UIImageView的图片即可。例如三个UIImageView默认放图片3、图片1、图片2，当前显示中间的UIImageView，也就是图片1,。如果向后滚动那么就会显示图片2，当图片2显示完整后迅速重新设置三个UIImageView的内容为图片1、图片2、图片3，然后通过contentOffset设置显示中间的UIImageView，也就是图片2。继续向后看到图片3，当图片3滚动完成迅速重新设置3个UIImageView的内容为图片2、图片3、图片1，然后设置contentOffset显示中间的UIImageView，也就是图片3。当然，向前滚动原理完全一样，如此就给用户一种循环错觉，而且不占用过多内存，具体方法实现如下：
首先我们先创建一个自定义视图：LFXScrollView，在这个视图里面实现循环滚动，这样方便自己以后的集成。
1.创建UIScorllView控件做为容器，放置我们后面创建UIImageview控件
2.创建UIPageControl控件，最为页码显示器
LFXScrollView视图.h文件里面的代码如下：
<span style="font-size:18px;">#import <UIKit/UIKit.h>typedef NS_ENUM(NSInteger,LFXScrollViewPageControlAlignment) { LFXScrollViewPageControlAlignmentCenter = 0, //居中 LFXScrollViewPageControlAlignmentLeft = 1, //左对齐 LFXScrollViewPageControlAlignmentRight = 2, //右对齐};@interface LFXScrollView : UIView@property (strong, nonatomic) NSArray *imagesA; //图片数据@property (strong, nonatomic) NSArray *imagesNameA; //图片数据@property (strong, nonatomic) NSArray *titleNameA; //说明数据@property (strong, nonatomic) UIColor *pageTintColor; //UIPageControl未选中颜色@property (strong, nonatomic) UIColor *currentTintColor; //UIPageControl选中颜色@property (assign, nonatomic) NSInteger selectCurrentPage; //当前选中的页数@property (assign, nonatomic) LFXScrollViewPageControlAlignment pageAlignment; //对齐方式@property (assign, nonatomic) BOOL openAuto; //是否自动轮播@property (assign, nonatomic) CGFloat timeInterval; //轮播时间间隔@end</span>LFXScrollView视图.m文件里面的代码如下：
<span style="font-size:18px;">//// LFXScrollView.m// 无限循环（UIScrollView）//// Created by apple on 13/4/16.// Copyright © 2016年 LFX. All rights reserved.//#import "LFXScrollView.h"static CGFloat PageControlH = 40;static CGFloat PageControlM = 20;static CGFloat TimeInt = 2.0;#define TitleF [UIFont systemFontOfSize:12.0]#define TitleC [UIColor whiteColor]static CGFloat TitleM = 10;typedef NS_ENUM(NSInteger,LFXScrollViewDataEnum) { LFXScrollViewDataImage = 0, LFXScrollViewDataImageName = 1,};@interface LFXScrollView()<UIScrollViewDelegate>@property (strong, nonatomic) UIImageView *leftImageView; //左边视图@property (strong, nonatomic) UIImageView *centerImageView; //中间视图@property (strong, nonatomic) UIImageView *rightImageView; //右边视图@property (weak, nonatomic) UIScrollView *scrollView; //滚动视图UIScrollView@property (assign, nonatomic) NSUInteger imagesCount; //图片数量@property (assign, nonatomic) NSUInteger currentImageIndex; //当前图片索引@property (weak, nonatomic) UIPageControl *pageControl; //分页控件@property (assign, nonatomic)LFXScrollViewDataEnum dateEnum; //数据类型（是图片还是名字）@property (strong, nonatomic) NSTimer * scrollTimer; //滑动定时器@property (weak, nonatomic) UILabel *titleL; //标题Label@end@implementation LFXScrollView- (instancetype)init { self = [super init]; if (self) { /** 添加子控件*/ [self addSubViews]; } return self;}- (instancetype)initWithFrame:(CGRect)frame { self = [super initWithFrame:frame]; if (self) { /** 添加子控件*/ [self addSubViews]; } return self;}- (instancetype)initWithCoder:(NSCoder *)aDecoder { self = [super initWithCoder:aDecoder]; if (self) { /** 添加子控件*/ [self addSubViews]; } return self;}/** * 添加子控件 */- (void)addSubViews { //添加滚动控件 [self addScrollView]; //添加图片控件 [self addImageViews]; //添加分页控件 [self addPapeControl]; self.openAuto = YES; //默认自动轮播 self.timeInterval = TimeInt; //轮播时间间隔}/** * 添加滚动控件 */- (void)addScrollView { UIScrollView *scrollView = [[UIScrollView alloc] initWithFrame:CGRectZero]; scrollView.delegate = self; scrollView.pagingEnabled = YES; scrollView.bounces = NO; scrollView.showsHorizontalScrollIndicator = NO; scrollView.showsVerticalScrollIndicator = NO; [self addSubview:scrollView]; self.scrollView = scrollView;}/** * 添加图片控件 */- (void)addImageViews { self.leftImageView.contentMode = UIViewContentModeScaleAspectFill; [self.scrollView addSubview:self.leftImageView]; self.centerImageView.contentMode = UIViewContentModeScaleAspectFill; [self.scrollView addSubview:self.centerImageView]; self.rightImageView.contentMode = UIViewContentModeScaleAspectFill; [self.scrollView addSubview:self.rightImageView];}/** * 添加分页控件 */- (void)addPapeControl { //创建一个视图 UIView *bgView = [[UIView alloc] init]; bgView.backgroundColor = [UIColor lightGrayColor]; bgView.tag = 1123; [self addSubview:bgView]; //创建UIPageControl UIPageControl *pageControl = [[UIPageControl alloc] init]; //居中显示 self.pageAlignment = LFXScrollViewPageControlAlignmentCenter; //只有一页隐藏页码 pageControl.hidesForSinglePage = YES; //设置颜色 pageControl.pageIndicatorTintColor = self.pageTintColor ? self.pageTintColor : [UIColor redColor]; pageControl.currentPageIndicatorTintColor = self.currentTintColor ? self.currentTintColor : [UIColor blueColor]; [bgView addSubview:pageControl]; self.pageControl = pageControl; //创建标题Label UILabel *label = [[UILabel alloc] init]; label.font = TitleF; label.textColor = TitleC; [bgView addSubview:label]; self.titleL = label; }#pragma mark#pragma mark -- 懒加载-(UIImageView *)leftImageView { if (!_leftImageView) { self.leftImageView = [[UIImageView alloc] init]; } return _leftImageView;}-(UIImageView *)centerImageView { if (!_centerImageView) { self.centerImageView = [[UIImageView alloc] init]; } return _centerImageView;}-(UIImageView *)rightImageView { if (!_rightImageView) { self.rightImageView = [[UIImageView alloc] init]; } return _rightImageView;}- (void)setImagesA:(NSArray *)imagesA { _imagesA = imagesA; if (imagesA) { self.imagesCount = imagesA.count; self.dateEnum = LFXScrollViewDataImage; //设置pageControl页数 self.pageControl.numberOfPages = self.imagesCount; }}- (void)setImagesNameA:(NSArray *)imagesNameA { _imagesNameA = imagesNameA; if (imagesNameA) { self.imagesCount = imagesNameA.count; self.dateEnum = LFXScrollViewDataImageName; //设置pageControl页数 self.pageControl.numberOfPages = self.imagesCount; }}-(void)layoutSubviews { [super layoutSubviews]; /** 设置ScrollView的大小和ImageView大小和图片*/ [self setScrollViewSizeAndImageViewSizeImage]; /**设置PageControll大小*/ [self setPageControlSize]; }/** * 设置ScrollView的大小和ImageView大小和图片 */- (void)setScrollViewSizeAndImageViewSizeImage { CGFloat W = self.frame.size.width ; CGFloat H = self.frame.size.height ; self.scrollView.frame = self.bounds; self.scrollView.contentSize = CGSizeMake(W * 3, 0); //让scrollView滑动到第一张图片位置 [self.scrollView setContentOffset:CGPointMake(W, 0) animated:NO]; self.leftImageView.frame = CGRectMake(0, 0, W, H); self.centerImageView.frame = CGRectMake(1 * W, 0, W, H); self.rightImageView.frame = CGRectMake(2 * W, 0, W, H); if (self.dateEnum == LFXScrollViewDataImage) { self.leftImageView.image = [self.imagesA lastObject]; self.centerImageView.image = [self.imagesA firstObject]; self.rightImageView.image = self.imagesA[1]; } else { self.leftImageView.image = [UIImage imageNamed:[self.imagesA lastObject]]; self.centerImageView.image = [UIImage imageNamed:[self.imagesA firstObject]]; self.rightImageView.image =[UIImage imageNamed:self.imagesA[1]] ; } self.currentImageIndex = self.selectCurrentPage = 0;}/** * 设置PageControll大小 */- (void)setPageControlSize { CGFloat W = self.frame.size.width ; CGFloat H = self.frame.size.height ; UIView *bgV = (UIView *)[self viewWithTag:1123]; bgV.frame = CGRectMake(0, H - PageControlH, W, PageControlH); //注意此方法可以根据页数返回UIPageControl合适的大小 CGSize pageCSize = [self.pageControl sizeForNumberOfPages:self.pageControl.numberOfPages]; //设置对齐方式 switch (self.pageAlignment) { case LFXScrollViewPageControlAlignmentCenter: { self.pageControl.frame = CGRectMake((W - pageCSize.width) / 2.0, 0, pageCSize.width, PageControlH); } break; case LFXScrollViewPageControlAlignmentLeft: { self.pageControl.frame = CGRectMake(PageControlM, 0, pageCSize.width, PageControlH); //判断是否有说明标题 if (self.titleNameA.count) { CGFloat M_X = PageControlM + pageCSize.width; self.titleL.frame = CGRectMake(M_X, 0,W - M_X - TitleM, PageControlH); self.titleL.textAlignment = NSTextAlignmentRight; self.titleL.text = self.titleNameA[self.currentImageIndex]; } } break; case LFXScrollViewPageControlAlignmentRight: { CGFloat page_x = - (self.pageControl.bounds.size.width - pageCSize.width - PageControlM) / 2.0 ; self.pageControl.bounds = CGRectMake(page_x, self.pageControl.frame.origin.y, self.pageControl.bounds.size.width, PageControlH); //判断是否有说明标题 if (self.titleNameA.count) { CGFloat M_X = PageControlM + pageCSize.width; self.titleL.frame = CGRectMake(TitleM, 0,W - M_X, PageControlH); self.titleL.textAlignment = NSTextAlignmentLeft; self.titleL.text = self.titleNameA[self.currentImageIndex]; } } break; default: break; } if(self.openAuto) { /**先移除定时器*/ if (self.scrollTimer)[self releaseTimer]; /** 添加定时器*/ [self addTimer]; } }#pragma mark#pragma mark -- UIScrollViewDelegate//滚动停止事件- (void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView { //重新加载图片 [self reloadImage]; //让scrollView滑动到第一个视图位置 [self.scrollView setContentOffset:CGPointMake(scrollView.frame.size.width, 0) animated:NO];}- (void)scrollViewDidEndDragging:(UIScrollView *)scrollView willDecelerate:(BOOL)decelerate { /** 添加定时器*/ [self addTimer];}-(void)scrollViewWillBeginDragging:(UIScrollView *)scrollView{ /** 移除定时器*/ [self releaseTimer];}/** * 移除定时器 */- (void)releaseTimer { if (self.scrollTimer) { [self.scrollTimer invalidate]; self.scrollTimer = nil; }}/** * 添加定时器 */- (void)addTimer { NSTimer *timer = [NSTimer timerWithTimeInterval: self.timeInterval target:self selector:@selector(timerAction:) userInfo:nil repeats:YES];#warning 当视图滑动时，定时器不执行方法，可以切换定时器模式为（NSRunLoopCommonModes）解决，即：// [[NSRunLoop currentRunLoop] addTimer:timer forMode:NSRunLoopCommonModes] [[NSRunLoop currentRunLoop] addTimer:timer forMode:NSDefaultRunLoopMode]; self.scrollTimer = timer;}/** * 重新加载图片 */- (void)reloadImage { CGFloat W = self.frame.size.width ; CGPoint offset = self.scrollView.contentOffset; if (offset.x > W) { //向右滑动（指向下一张图片索引） _currentImageIndex = (_currentImageIndex + 1) % self.imagesCount; }else if(offset.x < W){ //向左滑动（指向上一张图片索引） _currentImageIndex =(_currentImageIndex + self.imagesCount - 1) % self.imagesCount; } //改变PageControl页码 self.selectCurrentPage = self.pageControl.currentPage = self.currentImageIndex; //修改标题 if (self.titleNameA.count) { self.titleL.text = self.titleNameA[self.currentImageIndex]; } /**重新设置左右图片*/ [self setLeftImageViewAndRightImageView];}/** * 重新设置左右图片 */- (void)setLeftImageViewAndRightImageView { NSUInteger leftImageIndex,rightImageIndex; //图片索引 //重新设置左右图片 leftImageIndex = (_currentImageIndex + self.imagesCount - 1 ) % self.imagesCount; rightImageIndex = (_currentImageIndex + 1) % self.imagesCount; if (self.dateEnum == LFXScrollViewDataImage) { self.leftImageView.image = self.imagesA[leftImageIndex]; self.centerImageView.image = self.imagesA[_currentImageIndex]; self.rightImageView.image = self.imagesA[rightImageIndex]; } else { self.leftImageView.image = [UIImage imageNamed:self.imagesA[leftImageIndex]]; self.centerImageView.image = [UIImage imageNamed:self.imagesA[_currentImageIndex]]; self.rightImageView.image =[UIImage imageNamed:self.imagesA[rightImageIndex]] ; }}#pragma mark#pragma mark -- NSTimer 事件- (void)timerAction:(NSTimer *)timer { //让scrollView滑动到第二个视图位置 [self.scrollView setContentOffset:CGPointMake(self.scrollView.frame.size.width * 2, 0) animated:YES]; //重新设置索引 if (self.currentImageIndex == self.imagesCount - 1) { self.currentImageIndex = 0; } else { self.currentImageIndex ++; } self.selectCurrentPage = self.pageControl.currentPage = self.currentImageIndex; //修改标题 if (self.titleNameA.count) { self.titleL.text = self.titleNameA[self.currentImageIndex]; } //延迟执行方法,使其能出现滑动的效果 dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)( self.timeInterval * .1 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{ //重新设置左右图片 [self setLeftImageViewAndRightImageView]; //让scrollView滑动到第一个视图位置 [self.scrollView setContentOffset:CGPointMake(self.frame.size.width, 0) animated:NO]; });}/*// Only override drawRect: if you perform custom drawing.// An empty implementation adversely affects performance during animation.- (void)drawRect:(CGRect)rect { // Drawing code}*/@end</span><span style="font-size:18px;"> UIScrollView *scrollView = [[UIScrollView alloc] initWithFrame:CGRectZero]; scrollView.delegate = self; scrollView.pagingEnabled = YES; scrollView.bounces = NO; scrollView.showsHorizontalScrollIndicator = NO; scrollView.showsVerticalScrollIndicator = NO; [self addSubview:scrollView]; self.scrollView = scrollView;</span>
第二步：创建图片UIImageView控件添加在UIScorllView上：
<span style="font-size:18px;"> self.leftImageView.contentMode = UIViewContentModeScaleAspectFill; [self.scrollView addSubview:self.leftImageView]; self.centerImageView.contentMode = UIViewContentModeScaleAspectFill; [self.scrollView addSubview:self.centerImageView]; self.rightImageView.contentMode = UIViewContentModeScaleAspectFill; [self.scrollView addSubview:self.rightImageView];</span>
第三步：添加UIPageControl页码控件和标题说明（UILabel）到父视图上：
<span style="font-size:18px;"> //创建一个视图 UIView *bgView = [[UIView alloc] init]; bgView.backgroundColor = [UIColor lightGrayColor]; bgView.tag = 1123; [self addSubview:bgView]; //创建UIPageControl UIPageControl *pageControl = [[UIPageControl alloc] init]; //居中显示 self.pageAlignment = LFXScrollViewPageControlAlignmentCenter; //只有一页隐藏页码 pageControl.hidesForSinglePage = YES; //设置颜色 pageControl.pageIndicatorTintColor = self.pageTintColor ? self.pageTintColor : [UIColor redColor]; pageControl.currentPageIndicatorTintColor = self.currentTintColor ? self.currentTintColor : [UIColor blueColor]; [bgView addSubview:pageControl]; self.pageControl = pageControl; //创建标题Label UILabel *label = [[UILabel alloc] init]; label.font = TitleF; label.textColor = TitleC; [bgView addSubview:label]; self.titleL = label;</span>
<span style="font-size:18px;"> CGFloat W = self.frame.size.width ; CGFloat H = self.frame.size.height ; self.scrollView.frame = self.bounds; self.scrollView.contentSize = CGSizeMake(W * 3, 0); //让scrollView滑动到第一张图片位置 [self.scrollView setContentOffset:CGPointMake(W, 0) animated:NO]; self.leftImageView.frame = CGRectMake(0, 0, W, H); self.centerImageView.frame = CGRectMake(1 * W, 0, W, H); self.rightImageView.frame = CGRectMake(2 * W, 0, W, H); if (self.dateEnum == LFXScrollViewDataImage) { self.leftImageView.image = [self.imagesA lastObject]; self.centerImageView.image = [self.imagesA firstObject]; self.rightImageView.image = self.imagesA[1]; } else { self.leftImageView.image = [UIImage imageNamed:[self.imagesA lastObject]]; self.centerImageView.image = [UIImage imageNamed:[self.imagesA firstObject]]; self.rightImageView.image =[UIImage imageNamed:self.imagesA[1]] ; } self.currentImageIndex = self.selectCurrentPage = 0;</span><span style="font-size:18px;"> CGFloat W = self.frame.size.width ; CGFloat H = self.frame.size.height ; UIView *bgV = (UIView *)[self viewWithTag:1123]; bgV.frame = CGRectMake(0, H - PageControlH, W, PageControlH); //注意此方法可以根据页数返回UIPageControl合适的大小 CGSize pageCSize = [self.pageControl sizeForNumberOfPages:self.pageControl.numberOfPages]; //设置对齐方式 switch (self.pageAlignment) { case LFXScrollViewPageControlAlignmentCenter: { self.pageControl.frame = CGRectMake((W - pageCSize.width) / 2.0, 0, pageCSize.width, PageControlH); } break; case LFXScrollViewPageControlAlignmentLeft: { self.pageControl.frame = CGRectMake(PageControlM, 0, pageCSize.width, PageControlH); //判断是否有说明标题 if (self.titleNameA.count) { CGFloat M_X = PageControlM + pageCSize.width; self.titleL.frame = CGRectMake(M_X, 0,W - M_X - TitleM, PageControlH); self.titleL.textAlignment = NSTextAlignmentRight; self.titleL.text = self.titleNameA[self.currentImageIndex]; } } break; case LFXScrollViewPageControlAlignmentRight: { CGFloat page_x = - (self.pageControl.bounds.size.width - pageCSize.width - PageControlM) / 2.0 ; self.pageControl.bounds = CGRectMake(page_x, self.pageControl.frame.origin.y, self.pageControl.bounds.size.width, PageControlH); //判断是否有说明标题 if (self.titleNameA.count) { CGFloat M_X = PageControlM + pageCSize.width; self.titleL.frame = CGRectMake(TitleM, 0,W - M_X, PageControlH); self.titleL.textAlignment = NSTextAlignmentLeft; self.titleL.text = self.titleNameA[self.currentImageIndex]; } } break; default: break; } </span>注意：定时器模式的选择，以及延迟执行重写设置图片个UIScorllView滑动到中间图片的事件
<span style="font-size:18px;"><span style="color:#ff0000;"> </span>NSTimer *timer = [NSTimer timerWithTimeInterval: self.timeInterval target:self selector:@selector(timerAction:) userInfo:nil repeats:YES];#warning 当视图滑动时，定时器不执行方法，可以切换定时器模式为（NSRunLoopCommonModes）解决，即：// [[NSRunLoop currentRunLoop] addTimer:timer forMode:NSRunLoopCommonModes] [[NSRunLoop currentRunLoop] addTimer:timer forMode:NSDefaultRunLoopMode]; self.scrollTimer = timer;</span>
<span style="font-size:18px;">#pragma mark#pragma mark -- NSTimer 事件- (void)timerAction:(NSTimer *)timer { //让scrollView滑动到第二个视图位置 [self.scrollView setContentOffset:CGPointMake(self.scrollView.frame.size.width * 2, 0) animated:YES]; //重新设置索引 if (self.currentImageIndex == self.imagesCount - 1) { self.currentImageIndex = 0; } else { self.currentImageIndex ++; } self.selectCurrentPage = self.pageControl.currentPage = self.currentImageIndex; //修改标题 if (self.titleNameA.count) { self.titleL.text = self.titleNameA[self.currentImageIndex]; } //延迟执行方法,使其能出现滑动的效果 dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)( self.timeInterval * .1 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{ //重新设置左右图片 [self setLeftImageViewAndRightImageView]; //让scrollView滑动到第一个视图位置 [self.scrollView setContentOffset:CGPointMake(self.frame.size.width, 0) animated:NO]; });}<span style="color:#ff0000;"></span></span><span style="font-size:18px;">#pragma mark#pragma mark -- UIScrollViewDelegate//滚动停止事件- (void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView { //重新加载图片 [self reloadImage]; //让scrollView滑动到第一个视图位置 [self.scrollView setContentOffset:CGPointMake(scrollView.frame.size.width, 0) animated:NO];}- (void)scrollViewDidEndDragging:(UIScrollView *)scrollView willDecelerate:(BOOL)decelerate { /** 添加定时器*/ [self addTimer];}-(void)scrollViewWillBeginDragging:(UIScrollView *)scrollView{ /** 移除定时器*/ [self releaseTimer];}</span><span style="font-size:18px;">/** * 重新加载图片 */- (void)reloadImage { CGFloat W = self.frame.size.width ; CGPoint offset = self.scrollView.contentOffset; if (offset.x > W) { //向右滑动（指向下一张图片索引） _currentImageIndex = (_currentImageIndex + 1) % self.imagesCount; }else if(offset.x < W){ //向左滑动（指向上一张图片索引） _currentImageIndex =(_currentImageIndex + self.imagesCount - 1) % self.imagesCount; } //改变PageControl页码 self.selectCurrentPage = self.pageControl.currentPage = self.currentImageIndex; //修改标题 if (self.titleNameA.count) { self.titleL.text = self.titleNameA[self.currentImageIndex]; } /**重新设置左右图片*/ [self setLeftImageViewAndRightImageView];}</span><span style="font-size:18px;">/** * 重新设置左右图片 */- (void)setLeftImageViewAndRightImageView { NSUInteger leftImageIndex,rightImageIndex; //图片索引 //重新设置左右图片 leftImageIndex = (_currentImageIndex + self.imagesCount - 1 ) % self.imagesCount; rightImageIndex = (_currentImageIndex + 1) % self.imagesCount; if (self.dateEnum == LFXScrollViewDataImage) { self.leftImageView.image = self.imagesA[leftImageIndex]; self.centerImageView.image = self.imagesA[_currentImageIndex]; self.rightImageView.image = self.imagesA[rightImageIndex]; } else { self.leftImageView.image = [UIImage imageNamed:self.imagesA[leftImageIndex]]; self.centerImageView.image = [UIImage imageNamed:self.imagesA[_currentImageIndex]]; self.rightImageView.image =[UIImage imageNamed:self.imagesA[rightImageIndex]] ; }}</span>demo地址：https://github.com/LiFuxiong/Banner-.git
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