scrollView ，无限轮播加手势

#pragma amrk - 初始化

- (void)initScrollViewAndPageWithImgArray:(NSArray*)imgArray andSRect:(CGRect)scrollViewRectandPRect:(CGRect)pageRect

{

    sourceImgArray = [imgArray mutableCopy];

     

    self.frame= CGRectMake(0,0, [UIScreenmainScreen].bounds.size.width,120);

    self.scrollView= [[UIScrollViewalloc]initWithFrame:self.frame];

    self.scrollView.contentSize= CGSizeMake(self.scrollView.frame.size.width*3,self.scrollView.frame.size.height);

    [self.scrollViewsetContentOffset:CGPointMake(self.scrollView.frame.size.width,0)];

    self.scrollView.pagingEnabled= YES;

    self.scrollView.delegate= self;

    [selfaddSubview:self.scrollView];

    //给scrollview添加手势

    UITapGestureRecognizer*tapges = [[UITapGestureRecognizeralloc]initWithTarget:selfaction:@selector(clickAction:)];

    [self.scrollViewaddGestureRecognizer:tapges];

     

    headImgArrayCount = sourceImgArray.count;

    //加载imgview

    [selfaddImgViewForScrollView];

     

    self.page= [[UIPageControlalloc]initWithFrame:pageRect];

    self.page.currentPage= 0;

    self.page.numberOfPages= sourceImgArray.count;

    self.page.pageIndicatorTintColor= [UIColorwhiteColor];

    self.page.currentPageIndicatorTintColor= [UIColororangeColor];

    [selfaddSubview:self.page]; //把page加载到父视图上

     

    //添加计时器

    time = [NSTimerscheduledTimerWithTimeInterval:2target:selfselector:@selector(timeAction:)userInfo:nilrepeats:YES];

}

 

#pragma mark - 加载imageview的image

- (void)addImgViewForScrollView

{

    //添加imageview到scrollview

    staticdispatch_once_t predicate;

    dispatch_once(&predicate;, ^{

        self.leftImageView= [[UIImageViewalloc]initWithFrame:CGRectMake(0,0,self.scrollView.frame.size.width,self.scrollView.frame.size.height)];

        self.centerImageView= [[UIImageViewalloc]initWithFrame:CGRectMake(self.scrollView.frame.size.width,0,self.scrollView.frame.size.width,self.scrollView.frame.size.height)];

        self.rightImageView= [[UIImageViewalloc]initWithFrame:CGRectMake(2*self.scrollView.frame.size.width,0,self.scrollView.frame.size.width,self.scrollView.frame.size.height)];

         

        //设置三个imgview的图片

        leftImageIndex = headImgArrayCount-1;

        centerImageIndex = 0;

        rightImageIndex = 1;

         

        [self.scrollViewaddSubview:_leftImageView];

        [self.scrollViewaddSubview:_centerImageView];

        [self.scrollViewaddSubview:_rightImageView];

    });

    //加载左边的imgview,显示最后一张图片

    self.leftImageView.image= [UIImageimageNamed:sourceImgArray[leftImageIndex]];

     

    //加载右边的imgview,显示第二张图片

    self.rightImageView.image= [UIImageimageNamed:sourceImgArray[rightImageIndex]];

     

    //加载中间我们能看到的imgview,加载第一张图片

    self.centerImageView.image= [UIImageimageNamed:sourceImgArray[centerImageIndex]];

     

    //重新让scrollView便宜在最中间

    [self.scrollViewsetContentOffset:CGPointMake(self.scrollView.frame.size.width,0)];

    self.scrollView.userInteractionEnabled= YES;

}

 

#pragma mark - NSTimer计时器触发事件

- (void)timeAction:(NSTimer*)sender

{

    //刚开始滑动时

    if(self.page.currentPage== headImgArrayCount - 2){ //倒数第二张将要滑到倒数第一张时

        self.page.currentPage= headImgArrayCount-1;

        centerImageIndex = headImgArrayCount - 1;

        rightImageIndex = 0;

        leftImageIndex = centerImageIndex - 1;

    }

    elseif (self.page.currentPage== headImgArrayCount -1){  //倒数第一张将要滑到第一张时

        self.page.currentPage= 0;

        centerImageIndex = 0;

        leftImageIndex = headImgArrayCount - 1;

        rightImageIndex = centerImageIndex + 1;

    }

    else{

        self.page.currentPage+= 1;

        centerImageIndex = self.page.currentPage;

        leftImageIndex = centerImageIndex - 1;

        rightImageIndex = centerImageIndex + 1;

    }

    //先让scrollView进行偏移

    [self.scrollViewsetContentOffset:CGPointMake(self.scrollView.frame.size.width*2,0)animated:YES];

    //开大scrollview的交互

    self.scrollView.userInteractionEnabled= NO;

}

 

#pragma mark - scrollview轮播代理

//开始拖拽视图

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

{

    //停止计时器

    [timesetFireDate:[NSDatedistantFuture]];

}

 

//当手指在scrollview上停止触碰的时候点用该方法

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

{

    //手指松开时触发

    if(decelerate){

        self.scrollView.userInteractionEnabled= NO;

    }

}

 

#pragma mark - 当手动滑动，scrollview停止滚动时

//scrollView完全停止，有触碰事件时

- (void)scrollViewDidEndDecelerating:(UIScrollView*)scrollView

{

    //计算滑动停止后的偏移量

    CGFloatcontentOffset = scrollView.contentOffset.x-scrollView.frame.size.width;

    //计算翻动的＋－

    intoffsetPage = contentOffset/scrollView.frame.size.width;

     

    pageNum = self.page.currentPage;

    if(pageNum == 0&& offsetPage == -1){ //判断当在第1张向左滑时

        pageNum = -1;

    }

    if(pageNum == headImgArrayCount-1&& offsetPage == 1){ //判断当在最后一张向右滑时

        pageNum = headImgArrayCount;

    }

     

    //纪录当前scrollview的偏移页数

    self.page.currentPage+= offsetPage;

     

    /*

     * 重新计算选取图片的下标

     */

    if(pageNum == -1) {  //如果已经滑到scrollview的最前面即取图片数组的最左边时

         

        self.page.currentPage= headImgArrayCount-1;

        centerImageIndex = headImgArrayCount-1;

        leftImageIndex = centerImageIndex-1;

        rightImageIndex = 0;

        pageNum = headImgArrayCount;

    }

    elseif (pageNum == headImgArrayCount) {

         

        self.page.currentPage= 0;

        centerImageIndex = 0;

        leftImageIndex = headImgArrayCount-1;

        rightImageIndex = centerImageIndex+1;

        pageNum = 0;

    }

    else{

        centerImageIndex = self.page.currentPage;

        leftImageIndex = centerImageIndex-1;

        rightImageIndex = centerImageIndex+1;

        if(self.page.currentPage== 0) {

            leftImageIndex = headImgArrayCount-1;

        }

        if(self.page.currentPage== headImgArrayCount-1) {

            rightImageIndex = 0;

        }

    }

    [selfaddImgViewForScrollView];

    //重新打开交互,重启计时器

    self.scrollView.userInteractionEnabled= YES;

    time = [NSTimerscheduledTimerWithTimeInterval:2target:selfselector:@selector(timeAction:)userInfo:nilrepeats:YES];

}

 

#pragma mark - 当计时器启动，scrollview滚动结束时

//scrollview完全停止，代码写时

- (void)scrollViewDidEndScrollingAnimation:(UIScrollView*)scrollView;

{

    //让imageView换取图片

    [selfaddImgViewForScrollView];

}

 

#pragma mark - 点击scrollView手势动作

- (void)clickAction:(UITapGestureRecognizer*)sender

{

//    [self.delegate clickImageAction:sourceImgArray[self.page.currentPage]];

 

    [[NSNotificationCenterdefaultCenter]postNotificationName:@"MMMHeadScrollView"object:niluserInfo:@{@"MMMHeadScrollView":@(self.page.currentPage)}];

}

下面是点击事件，可以上下滑动查看










#pragma mark - 点击scrollView手势动作

- (void)clickAction:(UITapGestureRecognizer*)sender

{

//    [self.delegate clickImageAction:sourceImgArray[self.page.currentPage]];

  

    [[NSNotificationCenterdefaultCenter]postNotificationName:@"MMMHeadScrollView"object:niluserInfo:@{@"MMMHeadScrollView":@(self.page.currentPage)}];

}