Skip to main content

Apple Developer Docs

Fonts Symbols

Foundation / NSKeyValueSetMutationKind / NSKeyValueSetMutationKind.union

NSKeyValueSetMutationKind.union

Declaration

case union

Open on developer.apple.com

FoundationCase

iOS 2.0+iPadOS 2.0+Mac Catalyst 13.0+macOS 10.0+tvOS 9.0+visionOS 1.0+watchOS 2.0+

Built on 2026-05-07