# `BCCollectionViewDelegate collectionView:headerForGroup:`

*Instance Method*

## Declaration

```swift
optional func collectionView(_ collectionView: BCCollectionView!, headerFor group: BCCollectionViewGroup!) -> NSViewController!
```

```objc
- (NSViewController *) collectionView:(BCCollectionView *) collectionView headerForGroup:(BCCollectionViewGroup *) group;
```

```python
collectionView_headerForGroup_(collectionView: BCCollectionView, group: BCCollectionViewGroup) -> NSViewController
```