WeatherKit HourWeather precipitationAmount

So I've solved my own issue for now. It may not be pretty (haven't used strings much), but by defining this function I was able to extract the precipitation amount as a Measurement, just like other elements of the HourWeather struct.

// Function to get precipitationAmount as a measurement from one instance of HourWeather
// Written by Neil Gordon, 14 June 2022 - pending inclusion of precipitationAmount in the
// WeatherKit definition of the Structure for HourWeather

func precipitationAmount(hourWeatherElement: HourWeather) -> Measurement<UnitLength> {
    var contents : String = " "
    var answer = Measurement(value: -9.9, unit: UnitLength.millimeters)  // Default if problems

    print (hourWeatherElement, to: &contents)    // Get the contents of the instance as a string

    if let firstRange = contents.range(of: "precipitationAmount: ") {     // Find where precip amount should be
        let startIndex = firstRange.upperBound
        // Drop everything before that
        contents = String(contents[startIndex...])

        // Find position of first comma, then use up to just before that
        let commaIndex = contents.firstIndex(of: ",")!

        // Get the two bits of value and units - usually looks something like "2.3 mm"
        let contents = contents[..<commaIndex]
        let bits = contents.components(separatedBy: " ")

        // Convert string to a Double for use in Measurement

        if let amount = Double(bits[0])  {
            let units = bits[1]

           // I think mm and in are all I should see?

            if units == "mm" {
                 answer = Measurement(value: amount, unit: UnitLength.millimeters)
            } else {
                 answer = Measurement(value: amount, unit: UnitLength.inches)
            }
        }
    }
    return answer
}