Question

是否有简单的命令将1.60543e + 06格式化为1,605,436 ???

resultFV.text = String.localizedStringWithFormat（“％f”，fv）

没有得到它。

Answer 1

在Swift 3中，

NumberFormatter.localizedString(from: NSNumber(value: whatever), number: NumberFormatter.Style.decimal)

Answer 2

Swift Xcode 6.3，已解决（我决定在代码中保留$）。如果您不想在输出中使用$，请将.CurrencyStyle更改为.DecimalStyle

var fv = 3534234.55 
var formatter = NSNumberFormatter()
formatter.numberStyle = .CurrencyStyle
formatter.maximumFractionDigits = 0;
resultFV.text = formatter.stringFromNumber(fv) // result: $3,534,235 –

Answer 3

您应该使用NumberFormatter：

let numberFormatter = NumberFormatter()
numberFormatter.numberStyle = .decimal

resultFV.text = numberFormatter.string(from: fv)

Answer 4

更新Swift 4.1货币字符串：

let balance = 1234567

let formatter = NumberFormatter()
formatter.numberStyle = .currency
formatter.maximumFractionDigits = 0

let result = formatter.string(from: NSNumber(value: balance)) 
// result: $1,234,567

您可以将formatter.numberStyle更改为.decimal，将其保留为不带“$”符号的数字。

Answer 5

您可以通过在Swift 3 +中使用String初始化器来实现此目的：

// 1605436
let value: Int = 1605436

// "1,605,436" where Locale == en_US
let formattedInt = String(format: "%d", locale: Locale.current, value) 

// "1,605,436" where Locale == en_US
let formattedDouble = String(format: "%.0f", locale: Locale.current, Double(value))

Answer 6

为什么不限制精度，例如".0f"

resultFV.text = String.localizedStringWithFormat("%.0f", fv)

更新答案：

var formatter: NSNumberFormatter = NSNumberFormatter()
formatter.numberStyle = NSNumberFormatterStyle.DecimalStyle;
var formattedStr: NSString = formatter.stringFromNumber(NSNumber(double: fv))!
resultFV.text = formattedStr

Answer 7

Swift 5更新

var unformattedValue : Double = 3534234.55
var formatter = NumberFormatter()
formatter.numberStyle = .currency // or .decimal if desired
formatter.maximumFractionDigits = 2; //change as desired
formatter.locale = Locale.current // or = Locale(identifier: "de_DE"), more locale identifier codes: https://gist.github.com/jacobbubu/1836273
var displayValue : String = formatter.string(from: NSNumber(value: unformattedValue))! // displayValue: "$3,534,235" ```

Swift如何使用千位分隔符格式化大量数字？

7 个答案: