Instance PropertyFoundationEssentials
maximalIdentifier
iOS 16.0+
iPadOS 16.0+
Mac Catalyst 16.0+
macOS 13.0+
tvOS 16.0+
watchOS 9.0+
Returns a BCP-47 identifier that always includes the script: “zh-Hant-TW”, “en-Latn-US”
var maximalIdentifier: String { get }