how to convert Arabic numbers to English numbers in swift?

问题

in my app, I have 5 uitextfields. My intended users are Arabic speakers so when they use my app, they will either insert number in English or in Arabic.

The app works just fine with English numbers. However, when I run it and insert numbers in Arabic, the app deals with the textfields as if they all were empty and gives the answer as 0

How can I make sure that the textfields are not nill AND a double, whithout ignoring Arabic numbers?

This is the code inside the "calButton" function:

     /*let value1 = Double(income.text ?? "") ?? 0
    let value2 = Double(salaries.text ?? "") ?? 0
    let value3 = Double(tools.text ?? "") ?? 0
    let value4 = Double(maintinance.text ?? "") ?? 0
    let value5 = Double(otherExpenses.text ?? "") ?? 0
    let sum = value1 - ( value2 + value3 + value4 + value5)

    print("result is: \(sum)")*/



    let textFields = [income, salaries, tools, maintinance, otherExpenses]
    var sum = 0.0
    for textField in textFields {
        if let number = Double((textField?.text!)!) { //checks that it is not nil AND a Double
            sum += number
        }
    }

    expensesTotal.text = String(sum)
    // print("result is: \(sum)")

回答1:

You need to convert the arabic number string to english first and then do the calculation part.

    let numberStr: String = "٨٦٩١٢٨٨١"
    let formatter: NumberFormatter = NumberFormatter()
    formatter.locale = NSLocale(localeIdentifier: "EN") as Locale!
    let final = formatter.number(from: numberStr)
    let doubleNumber = Double(final!)
    print("\(doubleNumber)")

回答2:

Swift-5 solution for all non-Latin string occurrences.

extension String {
    var containsNonEnglishNumbers: Bool {
        return !isEmpty && range(of: "[^0-9]", options: .regularExpression) == nil
    }

    var english: String {
        return self.applyingTransform(StringTransform.toLatin, reverse: false) ?? self
    }
}

Usage -

textField.addTarget(self, action: #selector(didChangeText(field:)), for: .editingChanged)

@objc func didChangeText(field: UITextField) {
    if ((field.text?.containsNonEnglishNumbers) != nil) {
        field.text = field.text?.english
    }
}

回答3:

This will replace any arabic number to english

 func textField(_ textField: UITextField, shouldChangeCharactersIn range: NSRange, replacementString string: String) -> Bool {
        if textField.keyboardType == .numberPad && string != "" {
            let numberStr: String = string
            let formatter: NumberFormatter = NumberFormatter()
            formatter.locale = Locale(identifier: "EN")
            if let final = formatter.number(from: numberStr) {
                textField.text =  "\(textField.text ?? "")\(final)"
            }
                return false
        }
        return true
    }

dont forget setting the delegate:

yourTextField.delegat = self

来源：https://stackoverflow.com/questions/41668231/how-to-convert-arabic-numbers-to-english-numbers-in-swift

标签

ios

swift

uitextfield