UIScrollViewDelegate协议方法概述

（）contentSize：可以滑动区域的大小

contentOffset:滑动视图里面的内容的相对位置

contentInset:滑动视图在外面的相对位置

1、只要view有滚动（不管是拖、拉、放大、缩小等导致）都会执行此函数

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

2、将要开始拖拽，手指已经放在view上并准备拖动的那一刻

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

3、将要结束拖拽，手指已拖动过view并准备离开手指的那一刻，注意：当属性pagingEnabled为YES时，此函数不被调用

-(void)scrollViewWillEndDragging:(UIScrollView *)scrollView withVelocity:(CGPoint)velocity targetContentOffset:(inout CGPoint *)targetContentOffset;

4、已经结束拖拽，手指刚离开view的那一刻

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

5、view将要开始减速，view滑动之后有惯性

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

6、view已经停止滚动

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

7、view的缩放

-(void)scrollViewDidZoom:(UIScrollView *)scrollView

8、有动画时调用

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