ios - 在 Swift 中更改多种货币的分组分隔符、货币符号和货币符号的位置

Question

我的应用使用多种货币，这些货币使用不同的格式，例如:

卢布 的价格显示为:1,101 Руб。

相同金额的美元显示为:US $1 101

如何通过为不同的货币定义一组不同的格式来更改分组分隔符、货币符号和货币符号的位置。

这就是我的短代码的样子

var formatter = NSNumberFormatter()
formatter.numberStyle = .CurrencyStyle
formatter.locale = NSLocale.currentLocale()
formatter.stringFromNumber(4500000)
//Output : $4,500,000.00
//Expected : 4,500,000 Руб.

Answer 1

Swift 4 或更高版本

extension Formatter {
    static let belarusianRuble: NumberFormatter = {
        let formatter = NumberFormatter()
        // set the numberStyle to .CurrencyStyle
        formatter.numberStyle = .currency
        // set the desired negative and positive formats grouping, and currency symbol position
        formatter.positiveFormat = "#,##0 ¤"
        formatter.negativeFormat = "-#,##0 ¤"
        // set your custom currency symbol
        formatter.currencySymbol = "Руб"
        return formatter
    }()
}

---

let stringToDisplay = Formatter.belarusianRuble.string(for: 4500000)  // "4,500,000 Руб"

---

extension Formatter {
    static let currencyBYR: NumberFormatter = {
        let formatter = NumberFormatter()
        formatter.numberStyle = .currency
        formatter.positiveFormat = "#,##0 ¤"
        formatter.negativeFormat = "-#,##0 ¤"
        formatter.currencySymbol = "Руб"
        return formatter
    }()
    static let currencyEUR: NumberFormatter = {
        let formatter = NumberFormatter()
        formatter.locale = Locale(identifier: "pt_PT")
        formatter.numberStyle = .currency
        return formatter
    }()
    static let currencyUSD: NumberFormatter = {
        let formatter = NumberFormatter()
        formatter.locale = Locale(identifier: "en_US")
        formatter.numberStyle = .currency
        return formatter
    }()
    static let currencyBRL: NumberFormatter = {
        let formatter = NumberFormatter()
        formatter.locale = Locale(identifier: "pt_BR")
        formatter.numberStyle = .currency
        return formatter
    }()
    static let currencyRUB: NumberFormatter = {
        let formatter = NumberFormatter()
        formatter.locale = Locale(identifier: "ru_RU")
        formatter.numberStyle = .currency
        formatter.maximumFractionDigits = 0
        return formatter
    }()
    static let currencyLocale: NumberFormatter = {
        let formatter = NumberFormatter()
        formatter.locale = .current
        formatter.numberStyle = .currency
        return formatter
    }()
}

---

extension Numeric {
    var currencyLocale: String { return Formatter.currencyLocale.string(for: self) ?? "" }
    var currencyUSD: String { return Formatter.currencyUSD.string(for: self) ?? "" }
    var currencyEUR: String { return Formatter.currencyEUR.string(for: self) ?? "" }
    var currencyBYR: String { return Formatter.currencyBYR.string(for: self) ?? "" }
    var currencyBRL: String { return Formatter.currencyBRL.string(for: self) ?? "" }
    var currencyRUB: String { return Formatter.currencyRUB.string(for: self) ?? "" }
}

---

用法

let amount = 4500000.0

let stringLocale = amount.currencyLocale   // "$4,500,000.00"

let stringUSD = amount.currencyUSD         // "$4,500,000.00"
let stringEUR = amount.currencyEUR         // "4 500 000,00 €"
let stringBRL = amount.currencyBRL         // "R$ 4.500.000,00"
let stringBYR = amount.currencyBYR         // "4,500,000 Руб"
let stringRUB = amount.currencyRUB         // "4 500 000 ₽"