货币符号和值之间的间距：iOS swift 3

Question

我有一个带有 IAP 的应用。我需要根据位置显示价格。我已经做到了。现在我可以根据位置显示价格了。

但是，我需要在货币符号和值之间留一些间距。 即，我需要 9.99 美元（目前显示为 9.99 美元）。

仅供参考：我从 iTunes 获取价格（使用变量获取从 iTunes 获取的价格并将其显示在文本视图中）。

我没有成功：NSNumberFormatter paddingPosition doesn't work

我也提到了这个，但它也不起作用： Swift 3 and NumberFormatter (.currency) == ¤?

有什么建议吗？

我正在这样做：

var index: Int = 0 {
    didSet {

        var monthlyValue = String()

        if prefs.value(forKey: "monthly") != nil {

            monthlyValue = prefs.value(forKey: "monthly") as! String


        }

        let subcharges : Array<String>   = ["Free but limited just to get started","or \(monthlyValue) Billed Monthly",""]

        let yearlypermonth = Int()

        var mycurrency1 = String()

        if prefs.value(forKey: "yearly") != nil {

            let yearlyvalue = prefs.value(forKey: "yearly") as! String

            print("wallet view yearlyvalue: \(yearlyvalue)")

            let firstProduct  = StoreManager.shared.productsFromStore[0]

            if let mycurrency = firstProduct.priceLocale.currencySymbol {

                print("mycurrency: \(mycurrency)")

                mycurrency1 = mycurrency
                prefs.set(mycurrency, forKey: "mycurrency")

            }

            let formatter = NumberFormatter()
            formatter.numberStyle = .currency
//                formatter.paddingPosition = .afterPrefix
//
//                //formatter.locale = Locale(identifier: "en_US")
//                formatter.paddingCharacter = " "
//                formatter.formatWidth = 7


            let number1 = formatter.number(from: yearlyvalue)

            print("wallet view number1: \(number1)")

            let secondProd = StoreManager.shared.productsFromStore[1]

            let numberFormatter = NumberFormatter()
//                numberFormatter.paddingPosition = .afterPrefix
//                numberFormatter.paddingCharacter = " "
//                numberFormatter.formatWidth = 7
            // Get its price from iTunes Connect
            numberFormatter.locale = secondProd.priceLocale
            let price2Str = numberFormatter.string(from: secondProd.price)

            let currencynumbers2 =  secondProd.price.doubleValue / 12

            monthonValueforaYear = String(format: "%.2f", currencynumbers2)

            print("walletview VC monthonValueforaYear: \(monthonValueforaYear)")

            //prefs.set(price2Str, forKey: "yearly")
            prefs.set(monthonValueforaYear, forKey: "monthonValueforaYear")

        }
        var charges : Array<String> = ["\(mycurrency1) 0/m","\(mycurrency1 + monthonValueforaYear)/m","Coming Soon"]

        print("wallet view charges: \(charges)")

        self.Headingtitle.text    = Headingarray[index]
        self.planchargelabel.text  = charges[index]
        self.subchargelabel.text = subcharges[index]

有趣的是，对于 subchargelabel 值，我有一点间距

当我尝试运行该应用程序时，已注释的部分未注释。让你知道

感谢您的帮助！

Answer 1

将 formatWidth 属性和 paddingPosition 设置为 afterPrefix

var formatCurrency:  String {
    let formatter = NumberFormatter()
    formatter.usesGroupingSeparator = true
    formatter.numberStyle = .currency
    formatter.locale = Locale.current
    formatter.paddingPosition = .afterPrefix
    formatter.formatWidth = 6
    return formatter.string(for: self) ?? "N/A"   
}

Answer 2

仅仅放置符号、空格和数量并不是一个好主意。它的顺序可能因地区或货币而异。下面的方法会给你答案。

func customFormattedAmountString(amount: Int) -> String? {
    let formatter = NumberFormatter()
    formatter.numberStyle = .currency
    formatter.locale = Locale.current

    if let amountString = formatter.string(from: NSNumber(value: amount)) {
        // check if it has default space like EUR
        let hasSpace = amountString.rangeOfCharacter(from: .whitespaces) != nil

        if let indexOfSymbol = amountString.characters.index(of: Character(formatter.currencySymbol)) {
            if amountString.startIndex == indexOfSymbol {
                formatter.paddingPosition = .afterPrefix
            } else {
                formatter.paddingPosition = .beforeSuffix
            }
        }
        if !hasSpace {
            formatter.formatWidth = amountString.characters.count + 1
            formatter.paddingCharacter = " "
        }
    } else {
        print("Error while making amount string from given amount: \(amount)")
        return nil
    }

    if let finalAmountString = formatter.string(from: NSNumber(value: amount)) {
        return finalAmountString
    } else {
        return nil
    }
}

如下使用，

if let formattedAmount = customFormattedAmountString(amount: 5000000) {
    print(formattedAmount)
}

这将打印出美元，

$ 5,000,000.00

和欧元，

5.000.000,00 €

因为您想在货币符号和金额之间留出空格。如果你只是像第一个答案一样附加字符串，你会得到“€ 5.000.000,00”，而不是想要的 - “5.000.000,00 €”。

Answer 3

尝试如下格式化您需要的字符串。

let priceWithSpace: String? = firstProduct.priceLocale.currencySymbol + " " +   product.price