# init(_:content:) Creates an instance that uniquely identifies and creates slider ticks across updates based on the identity of the underlying data. ``` nonisolated init(_ data: Data, @SliderTickBuilder content: @escaping (Data.Element) -> Content) where ID == V.ID, V : Identifiable, V == Data.Element, Data.Element == Content.Value ``` ## Parameters `data` The identified data that the [`ForEach`](/documentation/SwiftUI/ForEach) instance uses to create slider ticks dynamically. `content` The builder that creates ticks dynamically for each element. --- 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)