Remove Decimal places from Currency?

Question

I have the following example:

// Currencies

var price: Double = 3.20
println("price: \(price)")

let numberFormater = NSNumberFormatter()
numberFormater.locale = locale
numberFormater.numberStyle = NSNumberFormatterStyle.CurrencyStyle
numberFormater.maximumFractionDigits = 2

I want to have the currency output with 2 digests. In case the currency digests are all zero I want that they will not be displayed. So 3,00 should be displayed as: 3. All other values should be displayed with the two digests.

How can I do that?

Answer 1

You have to set numberStyle to .decimal style to be able to set minimumFractionDigits property depending if the floating point is even or not:

extension FloatingPoint {
    var isWholeNumber: Bool { isZero ? true : !isNormal ? false : self == rounded() }
}

---

You can also extend Formatter and create static formatters to avoid creating the formatters more than once when running your code:

extension Formatter {
    static let currency: NumberFormatter = {
        let numberFormater = NumberFormatter()
        numberFormater.numberStyle = .currency
        return numberFormater
    }()
    static let currencyNoSymbol: NumberFormatter = {
        let numberFormater = NumberFormatter()
        numberFormater.numberStyle = .currency
        numberFormater.currencySymbol = ""
        return numberFormater
    }()
}

---

extension FloatingPoint {
    var currencyFormatted: String {
        Formatter.currency.minimumFractionDigits = isWholeNumber ? 0 : 2
        return Formatter.currency.string(for: self) ?? ""
    }
    var currencyNoSymbolFormatted: String {
        Formatter.currencyNoSymbol.minimumFractionDigits = isWholeNumber ? 0 : 2
        return Formatter.currencyNoSymbol.string(for: self) ?? ""
    }
}

---

Playground testing:

3.0.currencyFormatted            // "$3"
3.12.currencyFormatted           // "$3.12"
3.2.currencyFormatted            // "$3.20"

3.0.currencyNoSymbolFormatted    // "3"
3.12.currencyNoSymbolFormatted   // "3.12"
3.2.currencyNoSymbolFormatted    // "3.20"

let price = 3.2
print("price: \(price.currencyFormatted)")  // "price: $3.20\n"

Answer 2

Instead of using NSNumberFormatter you can just use NSString init(format: arguments:)

var string = NSString(format:@"%.2g" arguments:price)

I'm not good with swift, but this should work.

https://developer.apple.com/library/mac/documentation/Cocoa/Conceptual/Strings/Articles/formatSpecifiers.html#//apple_ref/doc/uid/TP40004265

Answer 3

Use this

  extension Double {
    var currencyFormatted: String {
      var isWholeNumber: Bool { isZero ? true : !isNormal ? false : self == rounded() }
      let formatter = NumberFormatter()
      formatter.numberStyle = .currency
      formatter.minimumFractionDigits = isWholeNumber ? 0 : 2
      return formatter.string(for: self) ?? ""
    }
  }