Get position of imageView on cell of a UICollectionView - objective-c

Question

I have a UICollectionView with custom cell that has some labels and an Image, I need to get where the image is situated in order to place a mask on top of it, I tried with the following code but every mask gets applied on top of the first cell.
This is the code I used:
- (UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath {
CollectionViewCell *cell = [collectionView dequeueReusableCellWithReuseIdentifier:reuseIdentifier forIndexPath:indexPath];
UIView *darken = [[UIView alloc]init];
darken.frame = cell.img.frame;
darken.backgroundColor = [UIColor colorWithRed:0 green:0 blue:0 alpha:0.4];
[collectionView insertSubview:darken aboveSubview:cell.img];
return cell;
}
How can I get the frame position of every single image on the cells?

Answer 1

Change your code to create just one view.
#define IMAGE_TAG 9999
- (UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath {
CollectionViewCell *cell = [collectionView dequeueReusableCellWithReuseIdentifier:reuseIdentifier forIndexPath:indexPath];
if (![cell viewWithTag:IMAGE_TAG])
{
UIView *darken = [[UIView alloc]init];
darken.frame = cell.img.frame;
[darken setTag:IMAGE_TAG];
darken.backgroundColor = [UIColor colorWithRed:0 green:0 blue:0 alpha:0.4];
[cell insertSubview:darken aboveSubview:cell.img];
}
return cell;
}