问题描述
我想复制在 Pinterest 应用程序中看到的效果,它们根据滚动方向隐藏顶部和底部栏.我的问题是:确定 UIScrollView 滚动方式的正确方法是什么?
I would like to copy the effect seen in Pinterest app, where they hide top and bottom bars depending on the direction of scrolling. My question is: what is the correct way to determine which way the UIScrollView is scrolling?
推荐答案
解决方案如下:
-(void)scrollViewWillBeginDragging:(UIScrollView *)scrollView { pointNow = scrollView.contentOffset; } -(void)scrollViewDidScroll:(UIScrollView *)scrollView { if (scrollView.contentOffset.y<pointNow.y) { DLog(@"down"); } else if (scrollView.contentOffset.y>pointNow.y) { DLog(@"up"); } }