# onDrag(_:preview:) Activates this view as the source of a drag and drop operation. ``` nonisolated func onDrag(_ data: @escaping () -> NSItemProvider, @ContentBuilder preview: () -> V) -> some View where V : View ``` ## Parameters `data` A closure that returns a single that represents the draggable data from this view. `preview` A [`View`](/documentation/SwiftUI/View) to use as the source for the dragging preview, once the drag operation has begun. The preview is centered over the source view. ## Return Value A view that activates this view as the source of a drag-and- drop operation, beginning with user gesture input. ## Discussion Applying the `onDrag(_:preview:)` modifier adds the appropriate gestures for drag and drop to this view. When a drag operation begins, a rendering of `preview` is generated and used as the preview image. To customize the lift preview, shown while the system transitions to show your custom `preview`, apply a [`contentShape(_:_:eoFill:)`](/documentation/SwiftUI/View/contentShape(_:_:eoFill:)) with a [`dragPreview`](/documentation/SwiftUI/ContentShapeKinds/dragPreview) kind. For example, you can change the preview’s corner radius or use a nested view as the preview. To use `Transferable` types directly and access a richer feature set — including multi-item drag via [`dragContainer(for:in:_:)`](/documentation/SwiftUI/View/dragContainer(for:in:_:)) — use [`draggable(_:)`](/documentation/SwiftUI/View/draggable(_:)) instead. > Important: Don’t dispatch work to the main actor while exporting the > item. Doing so isn’t supported and might cause a hang. If you register > data representations on the item provider yourself, make sure > their completion handlers don’t dispatch to the main thread. --- Copyright © 2026 Apple Inc. All rights reserved. | [Terms of Use](https://www.apple.com/legal/internet-services/terms/site.html) | [Privacy Policy](https://www.apple.com/privacy/privacy-policy)