在Swift中将千位分隔符添加到Int

您可以使用NSNumberFormatter指定其他分组分隔符，如下所示：

更新： Xpre 11.5•Swift 5.2

extension Formatter {    static let withSeparator: NumberFormatter = {        let formatter = NumberFormatter()        formatter.numberStyle = .decimal        formatter.groupingSeparator = " "        return formatter    }()}

extension Numeric {    var formattedWithSeparator: String { Formatter.withSeparator.string(for: self) ?? "" }}

2358000.formattedWithSeparator  // "2 358 000"2358000.99.formattedWithSeparator  // "2 358 000.99"let int = 2358000let intFormatted = int.formattedWithSeparator  // "2 358 000"let decimal: Decimal = 2358000let decimalFormatted = decimal.formattedWithSeparator  // "2 358 000"let decimalWithFractionalDigits: Decimal = 2358000.99let decimalWithFractionalDigitsFormatted = decimalWithFractionalDigits.formattedWithSeparator // "2 358 000.99"

如果您需要使用当前语言环境或固定语言环境将值显示为货币：

extension Formatter {    static let number = NumberFormatter()}extension Locale {    static let englishUS: Locale = .init(identifier: "en_US")    static let frenchFR: Locale = .init(identifier: "fr_FR")    static let portugueseBR: Locale = .init(identifier: "pt_BR")    // ... and so on}extension Numeric {    func formatted(with groupingSeparator: String? = nil, style: NumberFormatter.Style, locale: Locale = .current) -> String {        Formatter.number.locale = locale        Formatter.number.numberStyle = style        if let groupingSeparator = groupingSeparator { Formatter.number.groupingSeparator = groupingSeparator        }        return Formatter.number.string(for: self) ?? ""    }    // Localized    var currency:   String { formatted(style: .currency) }    // Fixed locales    var currencyUS: String { formatted(style: .currency, locale: .englishUS) }    var currencyFR: String { formatted(style: .currency, locale: .frenchFR) }    var currencyBR: String { formatted(style: .currency, locale: .portugueseBR) }    // ... and so on    var calculator: String { formatted(groupingSeparator: " ", style: .decimal) }}

用法：

1234.99.currency    // "$1,234.99"1234.99.currencyUS  // "$1,234.99"1234.99.currencyFR  // "1 234,99 €"1234.99.currencyBR  // "R$ 1.234,99"1234.99.calculator  // "1 234.99"

注意：如果您希望空格的宽度等于句点的宽度，则可以使用

"u{2008}"

Unipre空间

formatter.groupingSeparator = "u{2008}"