How to get localized file size units in Swift - swift

Question

I tried the following code:
let units: [ByteCountFormatter.Units] = [.useBytes, .useKB, .useMB, .useGB, .useTB, .usePB, .useEB, .useZB, .useYBOrHigher]
let localizedDescriptions = units.map { (unit) -> String in
let formatter = ByteCountFormatter()
formatter.includesCount = false
formatter.includesUnit = true
formatter.allowedUnits = [unit]
formatter.countStyle = .file
return formatter.string(fromByteCount: .max)
}
And expect it to be localized according to the documentation.
Class
ByteCountFormatter
A formatter that converts a byte count value
into a localized description that is formatted with the appropriate
byte modifier (KB, MB, GB and so on).
But unfortunately, I got only:
["bytes", "KB", "MB", "GB", "TB", "PB", "EB", "ZB", "YB"]
I tested:
Switch system locale and reload my mac(Saw different file size format in finder: "КБ", "МБ"... instead of "KB", "MB")
Playground/macOS template project.
Switched "Application language" in macOS template project.
PS
In any case thanks for reading this...

Answer 1

You cannot set a locale to ByteCountFormatter, but you can with MeasurementFormatter.
Here is a sample (modify the unitStyle and other properties as you need).
let units: [UnitInformationStorage] = [.bytes, .kilobytes, .megabytes, .gigabytes, .terabytes, .petabytes, .zettabytes, .yottabytes]
let localizedDescriptions = units.map({ unit -> String in
let formatter = MeasurementFormatter()
formatter.unitStyle = .short
formatter.locale = Locale(identifier: "ru_RU") //hard coded here, I guess it takes the current one
return formatter.string(from: unit)
})
Output:
$> ["Б", "кБ", "МБ", "ГБ", "ТБ", "ПБ", "ZB", "YB"]
Zetta & Yotta aren't translated though?
From NSHipster:
ByteCountFormatter, EnergyFormatter, MassFormatter, LengthFormatter, and MKDistanceFormatter are superseded by MeasurementFormatter.
Legacy Measure: ByteCountFormatter
Measurement Formatter Unit: UnitInformationStorage