Where to highlight UICollectionViewCell: delegate or cell?

Question

According to the Collection View Programming Guide one should handle the visual state of the cell highlights in the UICollectionViewDelegate. Like this:

Answer 1

Well...as all of these methods are correct. I've found the way that seems like the easiest one to me. Just override the setSelected: method (for example to change background color):

-(void)setSelected:(BOOL)selected{
    self.backgroundColor = selected?[UIColor greenColor]:[UIColor grayColor];
    [super setSelected:selected];
}

...it works "out of the box" (even with collectionView.allowsMultipleSelection)