UICollectionView Select and Deselect issue

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

Solution 1:

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:].

Solution 2:

I had a Deselect issue with UICollectionView and I found that I was not allowing multiple selection on collectionView. So when I was testing I tried always on the same cell and if single selection is ON you can't Deselect a cell already selected.

I had to add:

myCollectionView.allowsMultipleSelection = YES;

Solution 3:

Do you have a custom setSelected method in your Cell class? Are you calling [super setSelected:selected] in that method?

I had a mysterious problem where, I was using multiple selection, I could not deselect cells once they were selected. Calling the super method fixed the problem.

Solution 4:

This is kind of old but, since I encounter the same issue using swift I will add my answer. When using:

 collectionView.selectItemAtIndexPath(indexPath, animated: true, scrollPosition: [])

The cell didn't get selected at all. But when using:

cell.selected = true

It did get selected but I wasn't able to select/deselect the cell anymore.

My solution (use both methods):

cell.selected = true
collectionView.selectItemAtIndexPath(indexPath, animated: true, scrollPosition: .None)

When this two methods are called in:

func collectionView(collectionView: UICollectionView, cellForItemAtIndexPath indexPath: NSIndexPath) -> UICollectionViewCell

It worked perfectly!