# GeometryReader3D A container view that defines its content as a function of its own size and coordinate space. ``` @frozen nonisolated struct GeometryReader3D where Content : View ``` ## Overview This view returns a flexible preferred size to its own container view. This container differs from [`GeometryReader`](/documentation/SwiftUI/GeometryReader) in that it also reads available depth, and thus also returns a flexible preferred depth to its parent layout. Use the 3D version only in situations where you need to read depth, because it affects depth layout when used in a container like a [`ZStack`](/documentation/SwiftUI/ZStack). ## Topics ### Creating a geometry reader [`init(content:)`](/documentation/SwiftUI/GeometryReader3D/init(content:)) [`content`](/documentation/SwiftUI/GeometryReader3D/content) --- 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)