UICollectionView Tap selects more than one cell
I have a weird issue when clicking one UICell in a UICollectionView and then scrolling down or up in the UICollectionView. I can see that more than one cell is selected. The rest of the cells that are not selected appear to be randomly selected in the UICollectionView layout. I have 3 columns of cells and many rows in a UICollectionView.
In my code, I have the following:
- (void)collectionView:(UICollectionView *)myCV didSelectItemAtIndexPath:(NSIndexPath *)indexPath
{
LogInfo(@"Item Selected");
// highlight the cell user tapped on
UICollectionViewCell *cell = [myCV cellForItemAtIndexPath:indexPath];
[cell.layer setBorderWidth:10.0f];
cell.layer.borderColor = [UIColor colorWithRed: 108/255. green: 166/255. blue: 16/255. alpha:1.0].CGColor;
cell.layer.CornerRadius = 10;
}
The highlighting code just puts a border on the found cell.
Is there a way to ensure that only the selected cell is selected?
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Is it because cells can be reused correctly? that's why you are getting this result.
Decision
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Save the selected index path somewhere.
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Subclass your cell from UICollectionViewCell, then override the UICollectionViewCell prepareForReuse method , you need to reset from all the formatting you did (in the didSelectItemAtIndexPath method) to their default values and make the cell ready to use again. More on prepareForReuse here
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Apply the same formatting again in cellForRowItemAtIndexPath to the selected cell that the index path was stored first. here it is!
But in the end, I would guess that there is no need to do any type of cell formatting here. Try to understand UICollectionViewLayoutAttributes and use it to do things like this there.
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