How to get header of collection view in swift?

Question

How to get Header of collection view on DidSelectItemAtIndexPath for change text of header while select item.

Answer 1

As of iOS 9, you can use:

func supplementaryView(forElementKind elementKind: String, 
                 at indexPath: IndexPath) -> UICollectionReusableView? 

to get a supplementary view by index path.

Check out Apple's documentation

Answer 2

You can use:

func collectionView(collectionView: UICollectionView, didSelectItemAtIndexPath indexPath: NSIndexPath){
    let indexHeaderForSection = NSIndexPath(row: 0, section: indexPath.section) // Get the indexPath of your header for your selected cell
    let header = collectionView.viewForSupplementaryElementOfKind(indexHeaderForSection)
}