使用NSString格式化NSFormatter

Question

我得到了一个字符串对象的价格，我想将它格式化为货币。我使用以下代码：

var priceString : NSString = urlDict.objectForKey("price") as NSString 
var formatter = NSNumberFormatter()
formatter.numberStyle = .CurrencyStyle
formatter.locale = NSLocale.currentLocale()
let priceNumber = formatter.numberFromString(priceString)

我正在priceString中很好地获取数据，但priceNumber是nil。

如果我尝试这个：

var priceNumber : NSNumber = urlDict.objectForKey("price") as NSNumber 

然后priceNumber也是nil。

我应该采取什么方法从字符串中获得格式化的价格？

Answer 1

谢谢大家的建议:我已经将上述解决方案结合在一起，形成了一个功能：

 func formatAsPrice(priceString: NSString) -> NSString { 
    let rsSymbol = "\u{20B9}" // The currency symbol for India
    var priceStrTemp = priceString
    priceStrTemp = rsSymbol + priceStrTemp
    var formatter = NSNumberFormatter()
    formatter.numberStyle = .CurrencyStyle
    formatter.locale = NSLocale.currentLocale()
    formatter.locale = NSLocale(localeIdentifier: "en_IN") //Explicit
    formatter.secondaryGroupingSize = 2  // grouping as Indian currency style

    let priceNumber = formatter.numberFromString(priceStrTemp)!
    var finalPrice: NSString! = (rsSymbol + " \(priceNumber)") as NSString!

    return finalPrice

 }

Answer 2

格式化程序代码很好。

您必须传递带有货币符号的正确货币字符串。

func format(amount: String) -> NSNumber? {
  let formatter = NSNumberFormatter()
  formatter.numberStyle = .CurrencyStyle
  formatter.locale = NSLocale.currentLocale()
  return formatter.numberFromString(amount)
}
format("NOK 12,00") // returns 12.00
format("NOK 12") // Also fine
format("$ 12") // Error, my local currency is NOK (Norwegian krone)
format("12,00") // Error, needs currency symbol in the string.

如果您想解析尝试而没有像这个"12,00"那样的崇高的货币，那么应该将currencySymbol设置为空字符串。像这样

func format(amount: String) -> NSNumber? {
  let formatter = NSNumberFormatter()
  formatter.numberStyle = .CurrencyStyle
  formatter.currencySymbol = ""
 ...
}

format("12,00") // Works fine now