Formatting input for currency with NSNumberFormatter in Swift

Here's an example on how to use it on Swift 3.( Edit: Works in Swift 5 too )

let price = 123.436 as NSNumberlet formatter = NumberFormatter()formatter.numberStyle = .currency// formatter.locale = NSLocale.currentLocale() // This is the default// In Swift 4, this ^ was renamed to simply NSLocale.currentformatter.string(from: price) // "$123.44"formatter.locale = Locale(identifier: "es_CL")formatter.string(from: price) // $123"formatter.locale = Locale(identifier: "es_ES")formatter.string(from: price) // "123,44 €"

Here's the old example on how to use it on Swift 2.

let price = 123.436let formatter = NSNumberFormatter()formatter.numberStyle = .CurrencyStyle// formatter.locale = NSLocale.currentLocale() // This is the defaultformatter.stringFromNumber(price) // "$123.44"formatter.locale = NSLocale(localeIdentifier: "es_CL")formatter.stringFromNumber(price) // $123"formatter.locale = NSLocale(localeIdentifier: "es_ES")formatter.stringFromNumber(price) // "123,44 €"

Swift 3:

If you are looking for a solution that gives you:

• "5" = "$5"
• "5.0" = "$5"
• "5.00" = "$5"
• "5.5" = "$5.50"
• "5.50" = "$5.50"
• "5.55" = "$5.55"
• "5.234234" = "5.23"

Please use the following:

func cleanDollars(_ value: String?) -> String {    guard value != nil else { return "$0.00" }    let doubleValue = Double(value!) ?? 0.0    let formatter = NumberFormatter()    formatter.currencyCode = "USD"    formatter.currencySymbol = "$"    formatter.minimumFractionDigits = (value!.contains(".00")) ? 0 : 2    formatter.maximumFractionDigits = 2    formatter.numberStyle = .currencyAccounting    return formatter.string(from: NSNumber(value: doubleValue)) ?? "$\(doubleValue)"}

I have implemented the solution provided by @NiñoScript as an extension as well:

Extension

// Create a string with currency formatting based on the device locale//extension Float {    var asLocaleCurrency:String {        var formatter = NSNumberFormatter()        formatter.numberStyle = .CurrencyStyle        formatter.locale = NSLocale.currentLocale()        return formatter.stringFromNumber(self)!    }}

Usage:

let amount = 100.07let amountString = amount.asLocaleCurrencyprint(amount.asLocaleCurrency())// prints: "$100.07"

Swift 3

    extension Float {    var asLocaleCurrency:String {        var formatter = NumberFormatter()        formatter.numberStyle = .currency        formatter.locale = Locale.current        return formatter.string(from: self)!    }}