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：1,101Руб。

美元的相同金额显示为： US $ 1 101

如何通过为不同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

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"

实施为扩展名：

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 ₽"

Answer 2

我最终使用了使用当前区域设置十进制/千位/分组分隔符的Currency类（感谢评论中的@jcaron建议）

该课程提供的定制很少，这符合我的任务：

货币符号
最小/最大分数
左/右定位符号

class Currency {
    var formatter = NumberFormatter()
    var symbol: String
    var isRTL: Bool

    init(_ currencySymbol: String, minFractionDigits: Int, maxFractionDigits: Int, isRTL: Bool) {
        self.formatter.currencySymbol = ""
        self.formatter.minimumFractionDigits = minFractionDigits
        self.formatter.maximumFractionDigits = maxFractionDigits
        self.formatter.numberStyle = .currency

        self.symbol = currencySymbol
        self.isRTL = isRTL
    }

    func beautify(_ price: Double) -> String {
        let str = self.formatter.string(from: NSNumber(value: price))!
        if self.isRTL {
            return str + self.symbol
        }
        return self.symbol + str
    }
}

初始化所需的格式化程序

struct CurrencyFormatter {
    static let byr = Currency(" Руб.", minFractionDigits: 2, maxFractionDigits: 2, isRTL: true)
    static let usd = Currency("US $", minFractionDigits: 2, maxFractionDigits: 2, isRTL: false)
    static let rub = Currency("\u{20BD} ", minFractionDigits: 0, maxFractionDigits: 1, isRTL: false)
}

<强>用法

CurrencyFormatter.byr.beautify(12345.67) // Output: 12 345,67 Руб.
CurrencyFormatter.usd.beautify(12345.67) // Output: US $12 345,67
CurrencyFormatter.rub.beautify(12345.67) // Output: ₽ 12 345,7

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

2 个答案: