subscript(_:_:)

iOS
15+
macOS
12+
tvOS
15+
watchOS
8+
@preconcurrency subscript<T, U>(t: T.Type, u: U.Type) -> AttributedString.Runs.AttributesSlice2<T, U> where T : AttributedStringKey, U : AttributedStringKey, T.Value : Sendable, U.Value : Sendable { get }