• //只要滚动了就会触发

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

    {

      NSLog(@" scrollViewDidScroll");

     

    }

    //开始拖拽视图

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

    {

       NSLog(@"scrollViewWillBeginDragging");

    }

    //完成拖拽

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

    {

       NSLog(@"scrollViewDidEndDragging");

    }

    //将开始降速时

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

    {

       NSLog(@"scrollViewWillBeginDecelerating");

    }

     

    //减速停止了时执行,手触摸时执行执行

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

    {

       NSLog(@"scrollViewDidEndDecelerating");

    }

    //滚动动画停止时执行,代码改变时出发,也就是setContentOffset改变时

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

    {

       NSLog(@"scrollViewDidEndScrollingAnimation");

    }

    //设置放大缩小的视图,要是uiscrollview的subview

    - (UIView *)viewForZoomingInScrollView:(UIScrollView *)scrollView;   

    {

       NSLog(@"viewForZoomingInScrollView");

        return viewA;

    }

    //完成放大缩小时调用

    - (void)scrollViewDidEndZooming:(UIScrollView *)scrollView withView:(UIView *)view atScale:(float)scale; 

    {

       NSLog(@"scale between minimum and maximum. called after any 'bounce' animations");

    }

     

    //如果你不是完全滚动到滚轴视图的顶部,你可以轻点状态栏,那个可视的滚轴视图会一直滚动到顶部,那是默认行为,你可以通过该方法返回NO来关闭它

    - (BOOL)scrollViewShouldScrollToTop:(UIScrollView *)scrollView;   

    {

        NSLog(@"scrollViewShouldScrollToTop");

       return YES;

    }

     

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

    {

        NSLog(@"scrollViewDidScrollToTop");

    }