how to reload supplementary view in collectionView

Question

Is there an easy way to reload the suppplementary view only in a UICollectionViewFlowLayout? I don\'t want to reload the whole thing. Is it possible to do so?

Answer 1

If you want to change the layout or size of the supplementary view from the Controller, use[self.collectionView.collectionViewLayout invalidateLayout].If you want to refresh the supplementary view only,use [supplementaryView setNeedsDisplay].Use both if the supplementary view is complex and/or will change its dimensions.