MeasurementFormatter preferred unit

Question

Created May ’21

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We would like to show jump height as 31 cm instead of 0.3 m, but formatter insists on 0.3m when we select option natural scale and use metric system:

Code Block         var measurement = Measurement(value: 0.31, unit: UnitLength.meters)
        formatter.unitOptions = [.naturalScale]
        print(formatter.string(from: measurement))

same output with cm:

Code Block         var measurement = Measurement(value: 31, unit: UnitLength.centimeters)
        formatter.unitOptions = [.naturalScale]
        print(formatter.string(from: measurement))

and without natural scale we get "0 km"

How we can configure formatter to display 31 cm?

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Answer 1

Claude31 OP

May ’21

Use .providedUnit :

Code Block measurement = Measurement(value: 0.31, unit: UnitLength.centimeters)
 // Or measurement.convert(to: UnitLength.centimeters) 
formatter.unitOptions = [.providedUnit]
print(formatter.string(from: measurement))

I tested the following:

Code Block var formatter = MeasurementFormatter()
formatter.locale = Locale(identifier: "fr-fr")
var measurement = Measurement(value: 0.31, unit: UnitLength.meters)
 formatter.unitOptions = [.naturalScale]
 print(formatter.string(from: measurement))
measurement.convert(to: UnitLength.centimeters)
formatter.unitOptions = [.providedUnit]
print(formatter.string(from: measurement))

and got:
0,31 m
31 cm

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