UIScrollViewDelegate會(huì)經(jīng)常用到，在這里對(duì)代勞協(xié)定所包含的辦法簡(jiǎn)單描述，以便于今后應(yīng)用
幾個(gè)概念的懂得:
contentSize:可滑動(dòng)區(qū)域的大年夜小
contentOffset:滑動(dòng)視圖瑯綾擎的內(nèi)容的相對(duì)地位
contentInset:滑動(dòng)視圖在外面的相對(duì)地位
-(void)scrollViewDidScroll:(UIScrollView *)scrollView;
2、將要開(kāi)端拖拽棘手指已經(jīng)放在view上并預(yù)備拖動(dòng)的那一刻
-(void)scrollViewWillBeginDragging:(UIScrollView *)scrollView;
3、將要停止拖拽棘手指已拖動(dòng)過(guò)view并預(yù)備分開(kāi)手指的那一刻，留意：當(dāng)屬性pagingEnabled為YES時(shí)，此函數(shù)不被調(diào)用
-(void)scrollViewWillEndDragging:(UIScrollView *)scrollView withVelocity:(CGPoint)velocity targetContentOffset:(inout CGPoint *)targetContentOffset;
4、已經(jīng)停止拖拽棘手指剛分開(kāi)view的那一刻
-(void)scrollViewDidEndDragging:(UIScrollView *)scrollView willDecelerate:(BOOL)decelerate
5、view將要開(kāi)端減速，view滑動(dòng)之后有慣性
-(void)scrollViewWillBeginDecelerating:(UIScrollView *)scrollView;
6、view已經(jīng)停止?jié)L動(dòng)
7、view的縮放
-(void)scrollViewDidZoom:(UIScrollView *)scrollView
8、有動(dòng)畫(huà)時(shí)調(diào)用
-(void)scrollViewDidEndScrollingAnimation:(UIScrollView *)scrollView
1、只要view有滾動(dòng)（不管是拖、拉、放大年夜、縮小等導(dǎo)致）都邑履行此函數(shù)
-(void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView;