UICollectionView 单元格子视图不调整大小 [英] UICollectionView cell subviews do not resize

问题描述

在 CollectionView 中，一些单元格应该有一个额外的子视图或层.CollectionView 可以被告知调整其单元格的大小，因此所有内容都需要适当调整大小.

In a CollectionView, some cells should have an additional subview or layer. The CollectionView can be told to resize it's cells, thus all content needs to resize appropriately.

目前，该单元格是从一个包含带有 imageview 的单元格的 nib 初始化的；单元格笔尖链接到自定义 UICollectionViewCell 子类，该子类仅执行 init.Autoresize 子视图被选中.

Currently, the cell is initialized from a nib containing a cell with imageview; the cell nib is linked to a custom UICollectionViewCell subclass, that only does the init. Autoresize subviews is checked.

CollectionView 被告知通过在 sizeForItemAtIndexPath: 中派生和返回的值来调整单元格的大小.我对 FlowLayout 进行了子类化，但它只指定 ScrollDirection 和 Insets.

The CollectionView is told to resize the cell by a value derived and returned in sizeForItemAtIndexPath:. I have subclassed a FlowLayout but it only specifies ScrollDirection and Insets.

所有这些都运行良好.问题:如何将子视图/图层添加到单元格，以便它也正确调整大小?我尝试在关闭 translatesAutoresizingMaskIntoConstraints 的情况下添加子视图和图层，但它们根本不会自动更改大小.还尝试使用代码框架/视图而不是笔尖.

All of that is working fine. Problem: How do I add subview/layer to the cell so it also resizes correctly? I tried adding subviews and layers with translatesAutoresizingMaskIntoConstraints off, but these do not automatically change size at all. Also tried to use code frame/view instead of nib.

我现在得到的最好的是一个 cell.contentView.layer 子层，我将它添加到 cellForItemAtIndexPath:;这是通过从 sizeForItemAtIndexPath: 存储单元格的 frame.size 来手动"调整大小的，这不仅丑陋，而且最终导致子层对于不同的单元格具有不同的大小.

The best I got now is a cell.contentView.layer sublayer which I add in cellForItemAtIndexPath:; that is "manually" resized by storing the cell's frame.size from sizeForItemAtIndexPath:, which is not only ugly but also ends up with the sublayer having various sizes for different cells.

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推荐答案

解决方案是关闭单元格 xib 的 AutoConstraints 并激活图像视图的 AutoResize 中的灵活宽度/高度箭头.

The solution was to turn off AutoConstraints for the cell xib and activate the flexible width/height arrows in the AutoResize for the imageviews.

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