title: Action for header in UICollectionView IOS
body: <p>I have different number of headers in a collection in my code and when I click a header each header has different actions. If I select a cell, <code>- (void)collectionView:(UICollectionView *)collectionView didSelectItemAtIndexPath:(NSIndexPath *)indexPath</code> method is called. So, is there any delegate method which is called when any supplementary view is selected?</p>