Add a simple UIView as header of UICollectionView

In swift like below

Register Header View

collectionView.register(HeaderView.self, forSupplementaryViewOfKind: UICollectionView.elementKindSectionHeader, withReuseIdentifier: "headerView")

In UICollectionViewDataSource

func collectionView(collectionView: UICollectionView, viewForSupplementaryElementOfKind kind: String, atIndexPath indexPath: NSIndexPath) -> UICollectionReusableView {    let headerView = collectionView.dequeueReusableSupplementaryViewOfKind(UICollectionElementKindSectionHeader, withReuseIdentifier: "headerView", forIndexPath: indexPath)    headerView.frame.size.height = 100    return headerView}

Important is that you are supply the flow layout with the header size

flowLayout.headerReferenceSize = CGSize(width: self.collectionView.frame.size.width, height: 100)

Otherwise the data source method will not get called

If you don't set the header view in storyboard, you will have to register nib.

Example in viewDidLoad:

- (void)viewDidLoad{    [self.collectionView registerClass:NSStringFromClass([YourOwnSubClass class]) forSupplementaryViewOfKind:UICollectionElementKindSectionHeader withReuseIdentifier:@"HeaderViewIdentifier"];}

Anyway, you can also subclass UICollectionReusableView.

@interface YourOwnSubClass : UICollectionReusableView

then call delegate in your class example:

- (UICollectionReusableView *)collectionView:(UICollectionView *)collectionView           viewForSupplementaryElementOfKind:(NSString *)kind                                 atIndexPath:(NSIndexPath *)indexPath{    YourOwnSubClass *headerView = [collectionView dequeueReusableSupplementaryViewOfKind:                                         UICollectionElementKindSectionHeader withReuseIdentifier:@"HeaderView" forIndexPath:indexPath];        [self updateSectionHeader:headerView forIndexPath:indexPath];    return headerView;}- (void)updateSectionHeader:(UICollectionReusableView *)header forIndexPath:(NSIndexPath *)indexPath{    NSString *text = [NSString stringWithFormat:@"header #%i", indexPath.row];    header.label.text = text;}

And don't forget to set header size in collection view or in flow layout so header view will be visible.

None of above works if you forgot to enable accessory in your XIB file, don't forget to activate your desired section!