IOS中判断UIScrollerView滑动的方向

具体的代码如下，亲测效果很好，要实现凤凰新闻按钮显示和隐藏效果的童鞋有福了。

CGFloat  begainY;

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

   begainY = scrollView.contentOffset.y;

}

-(void)scrollViewDidScroll:(UIScrollView *)scrollView

{

   CGFloat endY = scrollView.contentOffset.y;

   if (endY-begainY>0) {

        NSLog(@"UP");

    }else{

       NSLog(@"DOWN");

    }  

}