为 UICollectionView 设置最小内容大小 [英] Set minimum contentsize for UICollectionView

问题描述

我希望能够在 UICollectionView 中设置内容大小的最小高度，以便我可以隐藏/显示 UISearchbar，类似于在 iBooks 上完成的方式.

I want to be able to set the minimum height of the content size within a UICollectionView, so I can hide/show a UISearchbar, similar to the way it's done on iBooks.

但是，我不想对布局进行子类化，因为我想保留 UICollectionView 的标准垂直布局.

However, I don't want to subclass the layout as I want to keep the standard vertical layout for a UICollectionView.

有什么想法吗?

推荐答案

你可以通过继承 UICollectionViewFlowLayout 并覆盖方法来做到这一点

You can do this by subclassing UICollectionViewFlowLayout and overriding the method

-(CGSize)collectionViewContentSize
{ //Get the collectionViewContentSize
     CGSize size = [super collectionViewContentSize];
     if (size < minimumSize) return minimumSize;
     else return size;
}

我刚刚意识到你说你不想对布局进行子类化.无论如何，我继承了 UICollectionViewFlowLayout 并且只修改了 collectionViewContentSize 方法.它为我保留了标准的垂直布局.

I just realized you said you didn't want to subclass the layout. Anyway, I subclassed UICollectionViewFlowLayout and only modified the collectionViewContentSize method. It kept the standard vertical layout for me.

https://stackoverflow.com/a/14465485/2017159.这里说UICollectionViewFlowLayout只支持一个方向(垂直或者水平)，应该没问题吧?

https://stackoverflow.com/a/14465485/2017159. Here it says UICollectionViewFlowLayout only supports one direction (vertical or horizontal), so it should be fine?

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