如何为 collectionView 自定义布局中的空白部分添加补充标题视图 [英] How to add supplementary header view for an empty section in collectionView custom layout

问题描述

我有一个 UICollectionView 显示自定义布局，不是琐碎的流布局.为每个 section 项目提供补充标题.

I have a UICollectionView that displays a custom layout, not the trivial flow layout. with supplementary headers for each section of items.

现在，我知道这对 UX 意义不大，但出于充分的理由，我需要为 empty 部分添加补充标题.问题是，除非该部分中有项目，否则 iOS 不会显示标题.

Now, I know this doesn't make a lot of UX sense, but for good reasons I need to add a supplementary header for an empty section. The thing is, iOS doesn't display the header unless it has items in the section.

对于这个特定问题，我遇到了一些建议，但是，它们都适用于 UICollectionViewFlowLayout，并且我正在处理自定义布局.

I have come across some suggestions to this particular matter, however, they all apply to a UICollectionViewFlowLayout, and I am dealing with a custom layout.

有人对此问题有有效的解决方案吗?

Anyone with an efficient solution for this matter?

推荐答案

如果实现了UICollectionViewDelegateFlowLayout协议，除了UICollectionViewDelegate和UICollectionViewDataSourcecode> 协议，即使没有项目，它也会触发所需的方法来调整大小和显示页眉和页脚视图.

If you implement the protocol UICollectionViewDelegateFlowLayout, in addition to the UICollectionViewDelegate and UICollectionViewDataSource protocols, it will trigger the desired methods to size, and display, the header and footer views, even when there are no items.

class YourViewController: UICollectionViewDelegate, UICollectionViewDataSource, UICollectionViewDelegateFlowLayout {
   ...
}

您不需要实现任何 UICollectionViewDelegateFlowLayout 方法，只需让您的类实现协议即可.

You to not need to implement any of the UICollectionViewDelegateFlowLayout methods, just have your class implement the protocol.

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