UICollectionView and Supplementary View (header)

Question

Trying to add a a Supplementary view into my UICollectionView as a header. I\'m having issues getting it to work.

I use a custom UICollectionViewFlowL

Answer 1

I also got this annoying error:

*** Assertion failure in -[UICollectionView _createPreparedSupplementaryViewForElementOfKind:atIndexPath:withLayoutAttributes:applyAttributes:], /SourceCache/UIKit/UIKit-3347.44/UICollectionView.m:1400
*** Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: 'UICollectionView dataSource is not set'

and I found some people solving this error by doing

- (void)dealloc {
    self.collectionView = nil;
}

or in swift:

deinit {
    collectionView = nil
}

however neither of these solved my crash. I tried a few things out and the following "hack" solved this annoying bug:

func collectionView(collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, referenceSizeForHeaderInSection section: Int) -> CGSize {
    if collectionView.dataSource != nil {
        return someHeaderSize
    } else {
        return CGSizeZero
    }
}