Add inner effect when item selected in collection view - ios

Question

I have a collection view and i want to add an image , with inner effect when one item is selected .
I made this but when i do scroll another item has the same effect and i don't want. How can i change this ?
- (CGSize)collectionView:(UICollectionView *)collectionView
layout:(UICollectionViewLayout *)collectionViewLayout
sizeForItemAtIndexPath:(NSIndexPath *)indexPath {
CollectionViewCell *cellO = [self.collection cellForItemAtIndexPath:celulaSelectata];
if ([selectedIndexPath isEqual:indexPath]) {
UIImage *inerImager =(UIView *)[cell viewWithTag:100];
cellO.inner.hidden=YES;
return CGSizeMake(100, 100);
}
else {
cellO.inner.hidden=NO;
return CGSizeMake(100, 100);
}
}
-(void)collectionView:(UICollectionView *)collectionView didDeselectItemAtIndexPath:(NSIndexPath *)indexPath {
CollectionViewCell *cellOne = [collectionView cellForItemAtIndexPath:indexPath];
cellOne.inner.hidden=YES;
recipeImageView = (UIImageView *)[cell viewWithTag:100];
recipeImageView.frame=CGRectMake(recipeImageView.frame.origin.x, recipeImageView.frame.origin.y, 100, 100);
}
- (void)collectionView:(UICollectionView *)collectionView didSelectItemAtIndexPath:(NSIndexPath *)indexPath {
if ([selectedIndexPath isEqual:indexPath]) {
selectedIndexPath = nil;
[self.player stop];
CollectionViewCell *cellOne = [collectionView cellForItemAtIndexPath:indexPath];
cellOne.inner.hidden=YES;
recipeImageView.frame=CGRectMake(recipeImageView.frame.origin.x, recipeImageView.frame.origin.y, 100, 100);
recipeImageView.layer.borderColor = [[UIColor blackColor] CGColor];
}
else {
celulaSelectata=indexPath;
UICollectionViewCell *cell = [collectionView cellForItemAtIndexPath:indexPath];
CollectionViewCell *cellOne = [collectionView cellForItemAtIndexPath:indexPath];
recipeImageView.frame=CGRectMake(recipeImageView.frame.origin.x, recipeImageView.frame.origin.y, 100, 100);
cellOne.inner.hidden=YES;
}

Answer 1

That is happening because cells are reused. In your CollectionViewCell class you have to implement the method:
-(void)prepareForReuse {
[super prepareForReuse];
//Clear the effect here.
}