# tag(_:) Sets the unique tag value of this piece of map content. ``` @MainActor @preconcurrency func tag(_ tag: V) -> some MapContent where V : Hashable ``` ## Parameters `tag` A value to use as the map content’s tag. ## Return Value Map content with the specified tag set. ## Discussion Use this modifier to differentiate between selectable content in the map. When the map’s selection binding has the same value as the tag applied to a piece of map content, that content is considered selected. A `ForEach` automatically applies a default tag to each enumerated view using the `id` parameter of the corresponding element. If the element’s `id` parameter and the the map’s selection input have the same type, you can omit the explicit tag modifier. --- 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)