UICollectionViewCell在出列时不会自动调用updateConstraints？ [英] UICollectionViewCell not calling updateConstraints automatically when dequeued?

问题描述

我有一个UICollectionViewCell子类。我写了一个 updateConstraints 方法，因为我之前做了一百次。由于某些原因，当细胞出列时从未调用过。我必须在将其取消后添加对 [cell setNeedsUpdateConstraints] 的手动调用。

I have a UICollectionViewCell subclass. I wrote an updateConstraints method as I've done a hundred times before. For some reason that is never called when the cell is dequeued. I had to add a manual call to [cell setNeedsUpdateConstraints] after dequeueing it.

任何想法可能会发生什么在这里？

Any idea what could be going on here?

推荐答案

实现此方法并返回YES。这可能会有所帮助。

Implement this method and return YES. This could probably help.

+ (BOOL)requiresConstraintBasedLayout

详情：

https://stackoverflow.com/a/23616469/1300262

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