Right now my code is to refresh all the data in collectionview by collectionView?.reloadData() but how can i only refresh the data in supplementary view or header view not all the data?
Thanks
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Alvin123
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`reloadData()` only reloads visible cells or views, so it's really fast. Why do you want to reload just the header? – EmilioPelaez Mar 13 '18 at 20:39
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Because reloadData() reload all the pic cell and make it slower and i only want to reload the text in the header view – Alvin123 Mar 13 '18 at 20:45
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Possible duplicate of [UICollectionView update a single cell](https://stackoverflow.com/questions/20296929/uicollectionview-update-a-single-cell) – Allison Mar 14 '18 at 04:05