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I'm trying to create a conversion from Fahrenheit to Celsius, which requires me to call on the amount the user chose. Here's what I have so far

@State private var temperatureChoices = ["Celsius", "Fahrenheit"]
     @State private var startTemp = "Celsius"
     @State private var endTemp = "Fahrenheit"
     @State private var startAmount = 0.0
     @State private var endAmount = 0.0
     let fToC = {
         return (5/9) * (startAmount - 32)
     }
var body: some view{

I've tried doing it without the closure, but that doesn't work either. I've tried doing it inside of the body, but that doesn't work. What am I doing wrong here? How do I instantiate a variable using another variable?

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  • You want a computed property, for fToC change it from let to var and remove the =. Commented Nov 6, 2022 at 23:13
  • I don't quite understand what you are doing, but looks weird to me that you have @State for every option. I would expect 1 state property for type of temperature (e.g. @State private var selectedType: String // "Celsius" or "Fahrenheit") and one @State for current selection (e.g. @State private var amount: Double // whatever user chose, in selectedType units). Also consider using enum to express "Celsius", "Fahrenheit" Commented Nov 6, 2022 at 23:16
  • @George I get two warnings when I do that. Computed property must have an explicit type and Type annotation missing in pattern Commented Nov 6, 2022 at 23:23
  • 2
    For conversion between celsius and fahrenheit, you can use the Measurement API in Swift. Commented Nov 7, 2022 at 1:17
  • try this: var fToC: Double { (5/9) * (startAmount - 32) } Commented Nov 7, 2022 at 2:07
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