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

The answers in this topic are quite old, and do not work in iOS8 and iOS9. If you are still having the described issue, check out the following topic: UICollectionView and Supplementary View crash

EDIT:

Here is the answer, in case the link becomes invalid:

If you are using custom layout in your collection view, check if its datasource is nil in:

- (NSArray *)layoutAttributesForElementsInRect:(CGRect)rect

The result should look something like this:

- (NSArray *)layoutAttributesForElementsInRect:(CGRect)rect
    if (self.collectionView.dataSource != nil) {
        // Your layout code    
        return array;
    }
    return nil;
}

This change resolves the following issue:

• Assertion failure in -[UICollectionView _createPreparedSupplementaryViewForElementOfKind:atIndexPath:withLayoutAttributes:applyAttributes:]

You can also check the following topic, however it didn't resolve anything in my case:

Removing empty space, if the section header is hidden in the UICollectionView

Hope it will help you, and you won't waste as much time as I did.