我对Swift还比较新,但是却很难找到以千位分隔符的方式添加空格的方法。
我希望实现的功能是:将计算结果显示在文本框中,并以以下格式显示:
2 358 000
而不是像下面这样:
2358000
例如。
我不确定是否应该先对Int值进行格式化,然后再将其转换为String,或者在将Int值转换为String之后添加空格。非常感谢任何帮助。
编辑/更新: 使用新的通用 formatted 方法(iOS15+/Xcode 13.0+):
当前区域设置
2358000.formatted() // "2,358,000"
2358000.formatted(.number.locale(.init(identifier: "fr_FR"))) // "2 358 000"
2358000.formatted(.number.locale(.init(identifier: "pt_BR"))) // "2.358.000"
原始帖子
您可以使用NSNumberFormatter来指定不同的分组分隔符,如下所示:
更新:Xcode 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 = 2358000
let intFormatted = int.formattedWithSeparator // "2 358 000"
let decimal: Decimal = 2358000
let decimalFormatted = decimal.formattedWithSeparator // "2 358 000"
let decimalWithFractionalDigits: Decimal = 2358000.99
let decimalWithFractionalDigitsFormatted = decimalWithFractionalDigits.formattedWithSeparator // "2 358 000.99"
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) }
}
使用方法:
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"
"\u{2008}"
。
formatter.groupingSeparator = "\u{2008}"
NSNumberFormatter
:let fmt = NSNumberFormatter()
fmt.numberStyle = .DecimalStyle
fmt.stringFromNumber(2358000) // with my locale, "2,358,000"
fmt.locale = NSLocale(localeIdentifier: "fr_FR")
fmt.stringFromNumber(2358000) // "2 358 000"
使用Swift 5,当您需要格式化数字的显示时,NumberFormatter
是正确的工具。
NumberFormatter
有一个名为numberStyle
的属性。可以将numberStyle
设置为NumberFormatter.Style.decimal
,以将格式化程序的样式设置为十进制。
因此,在最简单的情况下,当您想要使用十进制样式格式化数字时,可以使用以下Playground代码:
import Foundation
let formatter = NumberFormatter()
formatter.numberStyle = NumberFormatter.Style.decimal
let amount = 2358000
let formattedString = formatter.string(for: amount)
print(String(describing: formattedString))
Optional("2,358,000")
,在fr_FR环境下显示Optional("2 358 000")
。
NumberFormatter
的 locale
属性设置为 Locale.current
,与之前的 Playground 代码等效。import Foundation
let formatter = NumberFormatter()
formatter.numberStyle = .decimal
formatter.locale = Locale.current
let amount = 2358000
let formattedString = formatter.string(for: amount)
print(String(describing: formattedString))
NumberFormatter
的groupingSeparator
属性设置为Locale.current.groupingSeparator
,与前者等效:import Foundation
let formatter = NumberFormatter()
formatter.numberStyle = .decimal
formatter.groupingSeparator = Locale.current.groupingSeparator
let amount = 2358000
let formattedString = formatter.string(for: amount)
print(String(describing: formattedString))
import Foundation
let formatter = NumberFormatter()
formatter.numberStyle = .decimal
formatter.locale = Locale(identifier: "fr_FR")
let amount = 2358000
let formattedString = formatter.string(for: amount)
print(String(describing: formattedString))
// prints: Optional("2 358 000")
然而,如果你真正想要强制使用特定的分组分隔符,可以使用下面的Playground代码:
import Foundation
let formatter = NumberFormatter()
formatter.numberStyle = .decimal
formatter.groupingSeparator = " "
let amount = 2358000
let formattedString = formatter.string(for: amount)
print(String(describing: formattedString))
// prints: Optional("2 358 000")
在任何一个.swift
文件中,在类的外面:
struct Number {
static let withSeparator: NumberFormatter = {
let formatter = NumberFormatter()
formatter.groupingSeparator = " " // or possibly "." / ","
formatter.numberStyle = .decimal
return formatter
}()
}
extension Integer {
var stringWithSepator: String {
return Number.withSeparator.string(from: NSNumber(value: hashValue)) ?? ""
}
}
用法:
let myInteger = 2358000
let myString = myInteger.stringWithSeparator // "2 358 000"
代码:
//5000000
let formatter = NumberFormatter()
formatter.groupingSeparator = " "
formatter.locale = Locale(identifier: "en_US")
formatter.numberStyle = .decimal.
输出:
5 000 000
我正在寻找像 $100,000.00 这样的货币格式, 通过自定义 Leo Dabus 的实现,我成功地完成了它
extension Formatter {
static let withSeparator: NumberFormatter = {
let formatter = NumberFormatter()
formatter.numberStyle = .currency
formatter.currencyGroupingSeparator = ","
formatter.locale = Locale(identifier: "en_US") //for USA's currency patter
return formatter
}()
}
extension Numeric {
var formattedWithSeparator: String {
return Formatter.withSeparator.string(for: self) ?? ""
}
}
试试这个
func addPoints(inputNumber: NSMutableString){
var count: Int = inputNumber.length
while count >= 4 {
count = count - 3
inputNumber.insert(" ", at: count) // you also can use ","
}
print(inputNumber)
}
调用:
addPoints(inputNumber: "123456")
123 456(或者 123,456)