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# setNeedsDropPreviewUpdate()

Notifies the operating system that an updated drop preview is available for the item.

```
func setNeedsDropPreviewUpdate()
```

## Discussion

Call this method to provide an updated drop preview after UIKit has started the drop animation. If the drop animation is still ongoing, UIKit calls the drop interaction delegate’s [`dropInteraction(_:previewForDropping:withDefault:)`](/documentation/UIKit/UIDropInteractionDelegate/dropInteraction(_:previewForDropping:withDefault:)) method, passing the previous drop preview as the `defaultPreview`.

---

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