Как сделать расчет на основе UISegmentedControl

Question

Я делаю приложение калькулятора для химических дозировок.Есть три текстовых поля, объем, текущий и целевой.для объема пользователь может выбрать между галлоном и литром.В коде я сделал оператор переключения для расчета для каждого продукта, который находится в переменной result.Оттуда у меня есть функция configureLabel, которая просто покрывает result в мл или граммах.Однако, если пользователь выбирает литры из сегментированного элемента управления, мне нужно разделить result на 3,79.

Как / Где мне это сделать?Должен ли я сделать это в операторе switch для моих расчетов?Или где этикетка?

Вот весь соответствующий код.

func configureLabel(for result: Double) {
        // Liquid
        let inML = (result/10)
        let inFlOz = ((result * 0.033814)/10)
        let inTsp = ((result/5)/10)
        // Powder
        let grams = (result / 10)
        let tsp = (result/4.6)/10
        let oz = (result/28.35)/10
        // Rounds to 2 decimals, You can use rounded() but there will be no decimals in place.
        let roundedMl = Double(round(1000 * inML) / 1000)
        let roundedFlOz = Double(round(1000 * inFlOz) / 1000)
        let roundedtsp = Double(round(1000 * inTsp) / 1000)

        let roundedGrams = Double(round(1000 * grams) / 1000)
        let roundedPowderTsp = Double(round(1000 * tsp) / 1000)
        let roundedOz = Double(round(1000 * oz) / 1000)
        /*
         If in gallon leave the label as is, if it is in liters divide each result by 3.79
         */

        if chosenProduct.productType == liquid {
            mlGrLabel.text = String(roundedMl)
            ozLabel.text = String(roundedFlOz)
            tspLabel.text = String(roundedtsp)
        } else if chosenProduct.productType == powder {
            mlGrLabel.text = String(roundedGrams)
            ozLabel.text = String(roundedOz)
            tspLabel.text = String(roundedPowderTsp)
        }
    }

func configureProducts() {

        let aVolume  = Double(waterVolumeTextField.text!)
        let aCurrent = Double(currentLevelTextField.text!)
        let aTarget  = Double(targetLevelTextField.text!)
        let ratio    = chosenProduct.productRatio

        guard let volume = aVolume, let current = aCurrent, let target = aTarget else { return }
        self.resignFirstResponder()
        switch chosenProduct.name {
               case aquaForestKHPlus.name, brightwellAlk.name, brightwellReefCodeB.name, brightwellNanoCodeB.name, redseaReefFoundationB.name:
                   let result = calculateLiquidAlk(with: ratio, from: current, to: target, volume: volume)
                   configureLabel(for: result)
               case seachemReefCarb.name:
                   let result = 10 * (target - current) * volume
                   configureLabel(for: result)
               case seachemReefFusion2.name:
                   let result = (10 / ratio) * (target - current) * volume
                  configureLabel(for: result)
               case aquaForestKHBuffer.name:
                   let result = 10 * ((target - current) / 1) * ratio * volume
                   configureLabel(for: result)
               case brightwellAlkP.name, brightwellReefCodeBP.name, redseaReefFoundationBP.name:
                   let result = calculatePowderAlk(with: ratio, from: current, to: target, volume: volume)
                   configureLabel(for: result)
               case seachemReefBuilder.name, seachemReefBuffer.name:
                   let result = 10 * (target - current) * ratio * volume
                   configureLabel(for: result)
               // CALCIUM
               case aquaForestCAPlus.name, redseaReefFoundationA.name:
                   let result = calculateCalLiq(with: ratio, from: current, to: target, volume: volume)
                   configureLabel(for: result)
               case aquaForestCAP.name, bwCalcionPow.name, bwReefCodeAPow.name, fpCalChlo.name, tlfCa.name, esvbc2.name, kentTurbo.name, redseaReefFoundationAPow.name:
                   let result = calculateLiquidAlk(with: ratio, from: current, to: target, volume: volume)
                   configureLabel(for: result)
               case bwNanoCodeA.name, kentTech.name, bwReefCodeALiq.name, bwCalcionLiq.name, seachemReefFusion1L.name:
                   let result = calculateCalcium(with: ratio, from: current, to: target, volume: volume)
                   configureLabel(for: result)
               case seachemReefAdv.name, seachemReefComp.name:
                   let result = calculateSeaChemCal(with: ratio, from: current, to: target, volume: volume)
                   configureLabel(for: result)
               // Magnesium
               case aquaforestMgP.name, bwMgLiq.name, bwMgP.name, kentTechM.name, esvmg.name, rsmgpw.name, rsmgpw.name:
                   let result = calculateMagnesium(with: ratio, from: current, to: target, volume: volume)
                   configureLabel(for: result)
               // Phosphate
               case brightwellPhosphate.name, redseaNoPox.name, aquaforestPhosphateMinus.name:
                   hideFields()
                   let result = ratio * volume
                   configureLabel(for: result)
               // Trace element
               case afFluorine.name, afIodium.name, afIron.name, afKilum.name, afMicroE.name, afStrontium.name:
                   let result = ratio * volume
                   configureLabel(for: result)
               default:
                   break
               }
    }