How to convert english numbers inside a string to Persian/Arabic numbers in Objective-C?

Question

I have an english string that may or may not have numbers. But i want those numbers to be printed on screen as Persian numbers.

For example if NSString *foo =

Answer 1

Swift:

From Any language, To Any Language

with the following extension, you can do it:

extension String {
    private static let formatter = NumberFormatter()

    func clippingCharacters(in characterSet: CharacterSet) -> String {
        components(separatedBy: characterSet).joined()
    }

    func convertedDigitsToLocale(_ locale: Locale = .current) -> String {
        let digits = Set(clippingCharacters(in: CharacterSet.decimalDigits.inverted))
        guard !digits.isEmpty else { return self }

        Self.formatter.locale = locale
        let maps: [(original: String, converted: String)] = digits.map {
            let original = String($0)
            guard let digit = Self.formatter.number(from: String($0)) else {
                assertionFailure("Can not convert to number from: \(original)")
                return (original, original)
            }
            guard let localized = Self.formatter.string(from: digit) else {
                assertionFailure("Can not convert to string from: \(digit)")
                return (original, original)
            }
            return (original, localized)
        }

        var converted = self
        for map in maps { converted = converted.replacingOccurrences(of: map.original, with: map.converted) }
        return converted
    }
}

---

Usage

"سلام 12345".convertedDigitsToLocale(Locale(identifier: "FA")) /* سلام ۱۲۳۴۵ */
"Hello ۱۲۳۴۵".convertedDigitsToLocale(Locale(identifier: "EN")) /* Hello 12345 */