---
title: "collectionView(_:willDisplay:forRepresentedObjectAt:)"
framework: appkit
role: symbol
role_heading: Instance Method
path: "appkit/nscollectionviewdelegate/collectionview(_:willdisplay:forrepresentedobjectat:)"
---

# collectionView(_:willDisplay:forRepresentedObjectAt:)

Notifies the delegate that the specified item is about to be displayed by the collection view.

## Declaration

```swift
@MainActor optional func collectionView(_ collectionView: NSCollectionView, willDisplay item: NSCollectionViewItem, forRepresentedObjectAt indexPath: IndexPath)
```

## Parameters

- `collectionView`: The collection view that is adding the item.
- `item`: The item being added.
- `indexPath`: The index path of the item.

## Discussion

Discussion The collection view calls this method before adding new items to its content. You can use this method to track the addition of items and perform related tasks.

## See Also

### Tracking the Addition and Removal of Items

- [collectionView(_:didEndDisplaying:forRepresentedObjectAt:)](appkit/nscollectionviewdelegate/collectionview(_:didenddisplaying:forrepresentedobjectat:).md)
- [collectionView(_:willDisplaySupplementaryView:forElementKind:at:)](appkit/nscollectionviewdelegate/collectionview(_:willdisplaysupplementaryview:forelementkind:at:).md)
- [collectionView(_:didEndDisplayingSupplementaryView:forElementOfKind:at:)](appkit/nscollectionviewdelegate/collectionview(_:didenddisplayingsupplementaryview:forelementofkind:at:).md)