measurementFormatter.string not returning spurious information

Question

Created Jun ’20

Replies 3

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Participants 2

The demo was really interesting and enjoyable Neils.

The second Text view in the CaffeineAmountView returns "0 lb" in the widget instead of the expected "56.23 mg" as set in the static constant in the extension. Is this just a bug in the beta or is something else going on?

Code Block language     Text(measurementFormatter.string(from: data.caffeineAmount))

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Answer 1

allagog OP

Jun ’20

Ok, this issue was resolve by as follows. First a getCaffeineAmount method is created in the CaffeineAmountView:

Code Block Swift    func getCaffeineAmount(_ mass: Measurement<UnitMass>) -> String {
        let measurementFormatter = MeasurementFormatter()
				measurementFormatter.unitOptions = .providedUnit
        return measurementFormatter.string(from: mass)
    }

Then from the main VStack in the same struct, instead of the Text view,

Code Block SwiftText(measurementFormatter.string(from: data.caffeineAmount))

the following method call is made from a Text view:

Code Block SwiftText(getCaffeineAmount(data.caffeineAmount))

Any suggestions are welcome, regarding a different approach as I am certain there are many.

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Answer 2

OP

Apple

Jun ’20

Hi,

MeasurementFormatter is a powerful API, which means it sometimes requires a bit of configuration to get exactly the behavior you'd like. In this case, you can use the .providedUnit measurement option for the formatter, and pass it a Measurement in .milligrams:

Code Block let formatter = MeasurementFormatter()
formatter.unitOptions = [.providedUnit]
let string = formatter.string(for: Measurement(value: 60, unit: UnitMass.milligrams))!
print(string) // Prints "60 mg"

More documentation on MeasurementFormatter: https://developer.apple.com/documentation/foundation/measurementformatter

1

Answer 3

allagog OP

Jun ’20

Thank you very much for your reply.

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