---
title: "collectionView(_:dropSessionDidEnter:)"
framework: uikit
role: symbol
role_heading: Instance Method
path: "uikit/uicollectionviewdropdelegate/collectionview(_:dropsessiondidenter:)"
---

# collectionView(_:dropSessionDidEnter:)

Notifies you when dragged content enters the collection view’s bounds rectangle.

## Declaration

```swift
optional func collectionView(_ collectionView: UICollectionView, dropSessionDidEnter session: any UIDropSession)
```

## Parameters

- `collectionView`: The collection view that’s tracking the dragged content.
- `session`: The drop session object containing information about the type of data being dragged.

## Discussion

Discussion The collection view calls this method when dragged content enters its bounds rectangle. The method isn’t called again until the dragged content exits the collection view’s bounds (triggering a call to the collectionView(_:dropSessionDidExit:) method) and enters again. Use this method to perform any one-time setup associated with tracking dragged content over the collection view.

## See Also

### Tracking the drag movements

- [collectionView(_:dropSessionDidUpdate:withDestinationIndexPath:)](uikit/uicollectionviewdropdelegate/collectionview(_:dropsessiondidupdate:withdestinationindexpath:).md)
- [collectionView(_:dropSessionDidExit:)](uikit/uicollectionviewdropdelegate/collectionview(_:dropsessiondidexit:).md)
- [collectionView(_:dropSessionDidEnd:)](uikit/uicollectionviewdropdelegate/collectionview(_:dropsessiondidend:).md)