Wsrtjtyk

I currently have a textfield that takes an amount of a certain currency and whatever the user enters into the text field (I.E 500.00) is sent up to the server for validation before preceding.

The problem is that when the user has their iPhone region set to somewhere like France where numbers are formatted like 4 567,89 instead of 4,567.89, the validation on the backend misconstrues and will think the provided number is different from what it actually is.

Therefore I have a String in the format of 4 567,89 and I want to convert it to the format 4,567.89 or 4567.89

I have tried using a NumberFormatter with a given Locale but it can't recognise 4 567,89 as a number and fails.

This is what I tried:

extension String {



  func toEnglishNumberFormat() -> String? {

    let currencyFormatter = NumberFormatter()

    currencyFormatter.usesGroupingSeparator = false

    currencyFormatter.numberStyle = NumberFormatter.Style.decimal

    currencyFormatter.locale = Locale(identifier: "en_US_POSIX")

    if let amount = currencyFormatter.number(from: self) {

      return "(amount)"

    } else {

      return nil

    }

  }



}

Except this fails as currencyFormatter.number(from: self) cannot create a number from a string that looks like "4 567,89" or similar.

Anyway any ideas about how to handle numbers formatted in different regions so it won't fail validation? Thanks.

I think you should convert from string of whatever locale is current on their device, into an NSNumber. Then convert the NSNumber to en_US formatted number string as that's what your webservice expects.

extension String 

{

    func toEnglishNumberFormat() -> String? 

    {

        let numFormatter = NumberFormatter() // defaults to current locale

        numFormatter.numberStyle = NumberFormatter.Style.currency

        numFormatter.isLenient = true // will permit the spaces as separators

        guard let num = numFormatter.number(from: self) else

        {

            return nil

        }



        numFormatter.locale = Locale(identifier: "en_US_POSIX")

        numFormatter.numberStyle = NumberFormatter.Style.decimal

        let resultStr = numFormatter.string(from: num)

        return resultStr 

    }

}

I tested this while simulator was in French locale:

let str = "4 567,89"

let engStr = str.toEnglishNumberFormat()

print(engStr ?? "nil")

prints: 4567.89