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There is a method to get a cell by indexPath (UICollectionView cellForItemAtIndexPath:). But I can”t find a method to get one of the supplementary views like a header or footer, after it has been created. Any ideas?
UPDATE
As of iOS 9, you can use
-[UICollectionView supplementaryViewForElementKind:atIndexPath:]to get a supplementary view by index path.ORIGINAL
Your best bet is to make your own dictionary mapping index paths to supplementary views. In your
collectionView:viewForSupplementaryElementOfKind:atIndexPath:method, put the view into the dictionary before returning it. In yourcollectionView:didEndDisplayingSupplementaryView:forElementOfKind:atIndexPath:, remove the view from the dictionary.