InitializerFoundationEssentials
init(_:within:)
iOS 15.0+
iPadOS 15.0+
Mac Catalyst 15.0+
macOS 12.0+
tvOS 15.0+
watchOS 8.0+
init?<S>(_ sourcePosition: String.Index, within target: S) where S : AttributedStringProtocolInitializerFoundationEssentials
init?<S>(_ sourcePosition: String.Index, within target: S) where S : AttributedStringProtocol