UIScrollView滚动方向 [英] UIScrollView direction of scrolling

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

这是解决方案：

-(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");
    }
}

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