UICollectionView：如何检测滚动何时停止 [英] UICollectionView: how to detect when scrolling has stopped

问题描述

我正在使用 UICollectionView 快速滚动显示一组缩略图。滚动结束后，我想显示当前缩略图的更大的高分辨率版本。

I'm using a UICollectionView to scroll through a set of thumbnails quickly. Once scrolling ends, I'd like to display a larger hi-res version of the current thumbnail.

如何检测用户何时完成滚动？我实现了 didEndDisplayingCell ，但这只能告诉我特定单元格何时滚动;当滚动动作实际完成时它没有告诉我。

How can I detect when the user has completed scrolling? I do implement didEndDisplayingCell, but that only tells me when a particular cell has scrolled off; it doesn't tell me when the scroll motion actually completes.

推荐答案

NS_CLASS_AVAILABLE_IOS(6_0) @interface UICollectionView : UIScrollView

UICollectionView 是 UIScrollView 的子类。因此，如果您设置了委托并实现了 UIScrollViewDelegate ，那么您应该能够以与 UIScrollView 相同的方式检测到它。

UICollectionView is a subclass of UIScrollView. So if you have set the delegate and implemented UIScrollViewDelegate, you should be able to detect this the same way as UIScrollView.

例如： -

- (void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView;

根据 documentation ，上面的方法应该告诉滚动视图何时结束减慢滚动动作。

As per documentation, the above method should tell when the scroll view has ended decelerating the scrolling movement.

这篇关于UICollectionView：如何检测滚动何时停止的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！