A style format in which numbers are spelled out in the language defined by the number formatter locale.
- iOS 2.0+
- macOS 10.4+
- Mac Catalyst 13.0+
- tvOS 9.0+
- watchOS 2.0+
For example, in the en_US locale, the number 1234.5678 is represented as one thousand two hundred thirty-four point five six seven eight; in the fr_FR locale, the number 1234.5678 is represented as mille deux cent trente-quatre virgule cinq six sept huit.
This style is supported for most user locales. If this style doesn't support the number formatter locale, the en_US locale is used as a fallback.