# webViewOnScrollGeometryChange(for:of:action:) Adds an action to be performed when a value, created from a scroll geometry, changes. ``` nonisolated func webViewOnScrollGeometryChange(for type: T.Type, of transform: @escaping (ScrollGeometry) -> T, action: @escaping (T, T) -> Void) -> some View where T : Hashable ``` ## Parameters `type` The type of value transformed from a [`ScrollGeometry`](/documentation/SwiftUI/ScrollGeometry). `transform` A closure that transforms a [`ScrollGeometry`](/documentation/SwiftUI/ScrollGeometry) to your type. `action` A closure to run when the transformed data changes. ## Return Value A view that invokes the action when the relevant part of a web view’s scroll geometry changes. ## Discussion> Note: The content size of web content may exceed the current size of the view’s frame, however it will never be smaller than it. --- 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)