UICollectionView 选择和取消选择问题 [英] UICollectionView Select and Deselect issue

问题描述

所以我有一个主对象，其中有许多与之关联的图像.Image 也是一个对象.

So I have a main object that has many images associated with it. An Image is also an object.

假设你有一个集合视图控制器，并且在那个控制器中你有

Say you have a collection view controller, and in that controller you have

cellForItemAtIndexPath

基于主要对象，如果它具有与之关联的当前图像，我想将selected设置为true.但我希望用户能够随时取消选择"当前单元格以删除其与主对象的关联.

well based on the main object, if it has the current image associated with it I want to set selected to true. But I want the user to be able to "un-select" that current cell at any time to remove its association with the main object.

我发现如果您将selected 设置为 true" - 如果 cellForItemAtIndexPath 中的主要对象和图像之间存在关系，则不再可以选择取消选择.

I find that if you set "selected to true" - if there is an relation between the main object and image in cellForItemAtIndexPath, de-selection is no longer an option.

在

didDeselectItemAtIndexPath

和

didSelectItemAtIndexPath

我使用日志进行测试以查看它们是否被调用.如果一个单元格设置为选中 - 下界会被调用，但如果我从未在 cellForItemAtIndexPath 中将一个单元格设置为选中，我可以选择和取消选择所有我想要的.

I test with a log to see if they are called. If a cell is set to selected - nether gets called, but If I never set a cell to selected in cellForItemAtIndexPath I can select and deselect all I want.

这是集合视图应该工作的预期方式吗?我阅读了文档，但似乎并没有谈到这一点.我将文档解释为它以表格视图单元格的方式工作.有一些明显的变化

Is this the intended way a collection view is supposed to work? I read the docs and it does not seem to talk about this being so. I interpret the docs to mean it works the way a table view cell would. with a few obvious changes

这也表明控制器设置正确并且正在使用适当的委托方法....嗯

This also shows the controller is set up correct and is using the appropriate delegate methods.... hmmmm

推荐答案

我有同样的问题，即.在 [UICollectionView collectionView:cellForItemAtIndexPath:] 中设置 cell.selected = YES 然后无法通过点击取消选择单元格.

I had the same issue, ie. setting cell.selected = YES in [UICollectionView collectionView:cellForItemAtIndexPath:] then not being able to deselect the cell by tapping on it.

目前的解决方案:我在 中调用 both [UICollectionViewCell setSelected:] 和 [UICollectionView selectItemAtIndexPath:animated:scrollPosition:][UICollectionView collectionView:cellForItemAtIndexPath:].

Solution for now: I call both [UICollectionViewCell setSelected:] and [UICollectionView selectItemAtIndexPath:animated:scrollPosition:] in [UICollectionView collectionView:cellForItemAtIndexPath:].

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