Format speed in Swift

Question

I want to be able to format and print speed in localised form. I found a few pods that can do that but I'm looking for embedded solution (if possible).

Currently I do next:

 let unit = HKUnit.meterUnit(with: .kilo).unitDivided(by: .hour())
 let output = HKQuantity(unit: unit, doubleValue: 12.5).description

But in this case I cannot tune anything like use h instead of hr.

Answer 1

As said @Allan we have to use MeasurementFormatter. Check out the ready to use solution below.

import UIKit
import HealthKit

let value = NSMeasurement(doubleValue: 12.5, unit: UnitSpeed.milesPerHour)
let formatter = MeasurementFormatter()
formatter.numberFormatter.maximumFractionDigits = 2
formatter.string(from: value as Measurement<Unit>) // prints 12.5 mph

Answer 2

The description method of HKQuantity does not return a localized value and it is meant for debugging, not for display. Convert the HKQuantity instance to an NSMeasurement and use NSMeasurementFormatter (documentation here) to localize the value for display.