# updating(_:body:) Updates the provided gesture state property as the gesture’s value changes. ``` @MainActor @preconcurrency func updating(_ state: GestureState, body: @escaping (Self.Value, inout State, inout Transaction) -> Void) -> GestureStateGesture ``` ## Parameters `state` A binding to a view’s [`GestureState`](/documentation/SwiftUI/GestureState) property. `body` The callback that SwiftUI invokes as the gesture’s value changes. Its `currentState` parameter is the updated state of the gesture. The `gestureState` parameter is the previous state of the gesture, and the `transaction` is the context of the gesture. ## Return Value A version of the gesture that updates the provided `state` as the originating gesture’s value changes and that resets the `state` to its initial value when the user or the system ends or cancels the gesture. ## Discussion Use this callback to update transient UI state as described in [Adding interactivity with gestures](/documentation/SwiftUI/Adding-Interactivity-with-Gestures). --- 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)