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

问题描述

所以我有一个主要的对象，有许多图像与它相关联。图片也是一个对象。

假设您有一个集合视图控制器，并且在该控制器中有

cellForItemAtIndexPath

很好地基于主对象，如果它有当前图像与其关联我想设置选择为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。

我发现如果设置selected to true - 如果 cellForItemAtIndexPath ，取消选择不再是一个选项。

在

  didDeselectItemAtIndexPath 
  

和

  didSelectItemAtIndexPath 
  

我用日志测试他们是否被调用。如果一个单元格被设置为selected - nether被调用，但是如果我从未在 cellForItemAtIndexPath 中设置一个单元格，我可以选择和取消选择我想要的。

这是集合视图应该工作的预期方式吗？我读的文档，它似乎没有谈论这是这样的。我解释文档意味着它的工作方式一个表视图单元格。有一些明显的变化

这也显示控制器设置正确，并使用适当的委托方法... hmmmm

解决方案

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

现在的解决方案：我调用两者 [UICollectionViewCell setSelected：] 和 [UICollectionView collectionview：cellForItemAtIndexPath：] 中的 [UICollectionView selectItemAtIndexPath：animated：scrollPosition：] b $ b

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

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

cellForItemAtIndexPath

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.

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.

in

didDeselectItemAtIndexPath

and

didSelectItemAtIndexPath

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.

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

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

解决方案

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.

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

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