UICollectionView handle selection with NSIndexPath - ios

Question

I'm using a collection view in my app with the selection of cells ..
To handle the selection I am using an NSIndexPath that I call in didSelectItemAtIndexPath and in didDeselectItemAtIndexPath.
The selection seems to work fine but when I select two cells nearby it seems that the didDeselectItemAtIndexPath is not called ... where am I doing wrong?
this is my code
#property (nonatomic, strong) NSIndexPath *selectedIndex;
#implementation YearSelector
-(UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(nonnull NSIndexPath *)indexPath {
YearCell *cell = [collectionView dequeueReusableCellWithReuseIdentifier:yearCellID forIndexPath:indexPath];
cell.yearLabel.text = [NSString stringWithFormat:#"%#", self.yearArray[indexPath.item]];
if ([indexPath isEqual:self.selectedIndex]) [cell highlightedYear:YES];
else [cell highlightedYear:NO];
return cell;
}
-(void)collectionView:(UICollectionView *)collectionView didSelectItemAtIndexPath:(NSIndexPath *)indexPath {
NSIndexPath *newIndex = [NSIndexPath indexPathForItem:indexPath.item inSection:0];
[collectionView scrollToItemAtIndexPath:newIndex atScrollPosition:UICollectionViewScrollPositionCenteredHorizontally animated:NO];
YearCell *cell = (YearCell *)[collectionView cellForItemAtIndexPath:indexPath];
_selectedIndex = indexPath;
[cell highlightedYear:YES];
}
-(void)collectionView:(UICollectionView *)collectionView didDeselectItemAtIndexPath:(NSIndexPath *)indexPath {
YearCell *cell = (YearCell *)[collectionView cellForItemAtIndexPath:indexPath];
[cell highlightedYear:NO];
_selectedIndex = nil;
}
This is the code I use for highlighted cell ( Custom Year Cell)
-(void)highlightedYear:(BOOL)highlighted {
if (highlighted) {
_baseView.backgroundColor = [UIColor colorWithHexString:#"#FF7751" setAlpha:1];
_baseView.layer.borderColor = UIColor.clearColor.CGColor;
_yearLabel.textColor = UIColor.groupTableViewBackgroundColor;
}
else {
_baseView.backgroundColor = [UIColor colorWithHexString:#"#272D3D" setAlpha:1];
_baseView.layer.borderColor = [UIColor colorWithHexString:#"#485674" setAlpha:1].CGColor;
_yearLabel.textColor = UIColor.groupTableViewBackgroundColor;
}
}