UIScrollView

Property

1. alwaysBounceHorizontal

当水平滚动到内容边界的时候是否跳转

2. directionalLockEnabled

决定滚动是在某一特定方向是否禁用（实验了好像不管用）
3.dragging (read-only)
用户是否已经开始滚动
4.indicatorStyle
滚动视图滚动条的风格
   UIScrollViewIndicatorStyleDefault,

   UIScrollViewIndicatorStyleBlack,
   UIScrollViewIndicatorStyleWhite
5.keyboardDismissMode视图开始滚动时，键盘的消失方式

   UIScrollViewKeyboardDismissModeNone,   //无反应
   UIScrollViewKeyboardDismissModeOnDrag,   //拖动消失（拖动scroll键盘消失）
   UIScrollViewKeyboardDismissModeInteractive   //键盘互动消失（但是实验的时候只发现向下拖动键盘消失）

6.pagingEnabled

是否能够分页

7.scrollEnabled

8.scrollIndicatorInsets

滚动条和scrollview的边距

9，scrollsToTop

控制滑动到顶端的手势是否能够使用

10.showsHorizontalScrollIndicator，showsVerticalScrollIndicator

显示水平滚动条

11.tracking

返回用户是否触及内容开始滚动

METHOD

1.- (void)setContentOffset:(CGPoint)contentOffset
animated:(BOOL)animated
设定scrollview与内容远点的偏移量
2，- (void)setZoomScale:(CGFloat)scale
animated:(BOOL)animated

指定当前的缩放比例

3，- (BOOL)touchesShouldBegin:(NSSet
*)touches withEvent:(UIEvent
*)event inContentView:(UIView
*)view

由子类重写，点击内容视图时执行的方法

4，- (BOOL)touchesShouldCancelInContentView:(UIView
*)view

是否取消点击事件而开始拖动

5.- (void)zoomToRect:(CGRect)rect
animated:(BOOL)animated

缩放到指定区域使其可见

ScrollVIewDelegate

1.- (void)scrollViewDidEndDecelerating:(UIScrollView
*)scrollView

   告诉视图已经结束减速滚动的委托

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

  告诉视图拖动结束

3.- (void)scrollViewDidEndScrollingAnimation:(UIScrollView
*)scrollView

 当视图的一个滚动动画结束

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

当视图的内容缩放结束时

5.- (void)scrollViewDidScroll:(UIScrollView
*)scrollView

视图正在滚动时

6.- (void)scrollViewDidScrollToTop:(UIScrollView
*)scrollView

scrollview滚动到了视图顶部

7.-(void)scrollViewDidZoom:(UIScrollView
*)scrollView

告诉代理视图被缩放

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

询问代理scrollview是否能够到达视图顶部

9，- (void)scrollViewWillBeginDecelerating:(UIScrollView
*)scrollView

视图开始减速

10，- (void)scrollViewWillBeginDragging:(UIScrollView
*)scrollView

   视图开始滚动

11，- (void)scrollViewWillBeginZooming:(UIScrollView
*)scrollView withView:(UIView
*)view

  视图缩放即将开始

view是将要被缩放的视图

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

视图将完成缩放

velocity：scrollview在某点释放时的速率

targetContentOffset：视图滚动结束后的补偿

13，- (UIView
*)viewForZoomingInScrollView:(UIScrollView
*)scrollView

当预估scrollview中将要进行缩放的view缩放后的view