UIscrollView滚动时调用的方法

//UIscrollView开始拖拽的时候调用- (void)scrollViewWillBeginDragging:(UIScrollView *)scrollView{    NSLog(@"开始拖拽");}//UIscrollView拖拽结束的时候调用-(void)scrollViewDidEndDragging:(UIScrollView *)scrollView willDecelerate:(BOOL)decelerate{    NSLog(@"拖拽结束");}//UIscrollView拖拽结束的时候调用-(void)scrollViewDidScroll:(UIScrollView *)scrollView{    //在滚动的时候调用} //UIscrollView开始减速的时候调用-(void)scrollViewWillBeginDecelerating:(UIScrollView *)scrollView{    NSLog(@"开始减速");   }//UIscrollView减速停止的时候调用-(void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView{    NSLog(@"减速停止");}-(UIView *)viewForZoomingInScrollView:(UIScrollView *)scrollView{    return [scrollView viewWithTag:9999];    //只有实现这个方法 才能执行缩放 指定对象;}-(void)scrollViewDidZoom:(UIScrollView *)scrollView{    NSLog(@"缩放时一直触发");   }- (UIView *)viewForZoomingInScrollView:(UIScrollView *)scrollView{    return _imageView;}#pragma mark 当缩放完毕的时候调用- (void)scrollViewDidEndZooming:(UIScrollView *)scrollView withView:(UIView *)view atScale:(float)scale{//    NSLog(@"结束缩放 - %f", scale);}#pragma mark 当正在缩放的时候调用- (void)scrollViewDidZoom:(UIScrollView *)scrollView{//    NSLog(@"-----");}