Use case: I'm using the following String extension to change the language/locale in the Swift UI environment, I then pass the locale through to the function to get a localised string. I've made a little Swift UI preview container with an editor panel so we can toggle values in the environment (dark mode, layout direction, locale/language etc) on previews and also within a playbook app - without needing to select a drop-down in the Xcode scheme editor and restarting the app, or needing to change the device settings (although we have to do that when running on iOS 15.) func localized(_ locale: Locale, bundle: Bundle = .module) -> String { if #available(iOS 16, *) { String( localized: LocalizedStringResource( String.LocalizationValue(self), locale: locale, bundle: .atURL(bundle.bundleURL) ) ) } else { String(localized: String.LocalizationValue(self), bundle: bundle) } }