# init(_:value:) ``` convenience init(_ trait: T.Type, value: T.Value) where T : UITraitDefinition, T.Value == Double ``` --- 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)