UIScrollView常用属性及回调方法

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//真实内容大小(设置了这个属性才能滑动)
_scrollView.contentSize = CGSizeMake(self.view.bounds.size.width * 5, self.view.bounds.size.height);
//偏移量
_scrollView.contentOffset = CGPointMake(0, 0);
//额外区域大小
_scrollView.contentInset = UIEdgeInsetsMake(0, 100, 0, 0);

//分页属性
_scrollView.pagingEnabled = YES;
//锁定滑动的方向
_scrollView.directionalLockEnabled = YES;
//反弹效果
_scrollView.bounces = YES;
//在垂直方向总保持反弹(bounces==YES)
_scrollView.alwaysBounceVertical = YES;
//滑动效果开关
_scrollView.scrollEnabled = YES;
//显示水平方向的滑动条
_scrollView.showsHorizontalScrollIndicator = NO;
//滑动条位置
_scrollView.scrollIndicatorInsets = UIEdgeInsetsMake(0, 100, 100, 100);
//滑动条类型
_scrollView.indicatorStyle = UIScrollViewIndicatorStyleWhite;
//减速速度 0~1
_scrollView.decelerationRate = 1;
//最小缩放比例
_scrollView.minimumZoomScale = 1.0;
//最大缩放比例
_scrollView.maximumZoomScale = 2.0;
//缩放反弹效果
_scrollView.bouncesZoom = NO;

//只要滑动就会调用
- (void)scrollViewDidScroll:(UIScrollView *)scrollView

//将要开始拖拽
- (void)scrollViewWillBeginDragging:(UIScrollView *)scrollView

//布尔值代表了拖拽结束后有没有减速过程
- (void)scrollViewDidEndDragging:(UIScrollView *)scrollView willDecelerate:(BOOL)decelerate

//有拖拽，减速过程不一定有
- (void)scrollViewWillBeginDecelerating:(UIScrollView *)scrollView

//结束减速
- (void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView

//结束动画
- (void)scrollViewDidEndScrollingAnimation:(UIScrollView *)scrollView

//允许不允许滑动到顶端
- (BOOL)scrollViewShouldScrollToTop:(UIScrollView *)scrollView

//滑动到顶端
- (void)scrollViewDidScrollToTop:(UIScrollView *)scrollView

//返回值就代表需要缩放的view
- (UIView *)viewForZoomingInScrollView:(UIScrollView *)scrollView

//将要开始缩放
- (void)scrollViewWillBeginZooming:(UIScrollView *)scrollView withView:(UIView *)view

//结束缩放
- (void)scrollViewDidEndZooming:(UIScrollView *)scrollView withView:(UIView *)view atScale:(CGFloat)scale

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