How to get Local Currency for SKProduct | Display IAP Price in Swift

The StoreKit Programming Guide has this code snippet for showing the price using the App Store currency:

NSNumberFormatter *numberFormatter = [[NSNumberFormatter alloc] init];
[numberFormatter setFormatterBehavior:NSNumberFormatterBehavior10_4];
[numberFormatter setNumberStyle:NSNumberFormatterCurrencyStyle];
[numberFormatter setLocale:product.priceLocale];
NSString *formattedPrice = [numberFormatter stringFromNumber:product.price];

https://developer.apple.com/library/content/documentation/NetworkingInternet/Conceptual/StoreKitGuide/Chapters/ShowUI.html Listing 2-3

you should use NSNumberFormatter with the product values for price and priceLocale to output a string that is formatted correctly regardless of the user's location. product.price returns the price in the local currency as an NSDecimalNumber, and product.productLocale returns the NSLocale for the price value.

eg

var item = SKProduct()
for i in productsArray {
    if i.productIdentifier == "com.Company.App.item1" {
      item = i
      if let formattedPrice = priceStringForProduct(item) {
        //update ui with price
      }
    } 
 }

where priceStringForProduct is function defined elsewhere:-

func priceStringForProduct(item: SKProduct) -> String? {
    let numberFormatter = NSNumberFormatter()
    let price = item.price
    let locale = item.priceLocale
    numberFormatter.numberStyle = .CurrencyStyle
    numberFormatter.locale = locale
    return numberFormatter.stringFromNumber(price)
}

You might also want to handle the special case where the price is 0.0 (free tier). In this case amend the priceStringForProduct function to:

func priceStringForProduct(item: SKProduct) -> String? {
    let price = item.price
    if price == NSDecimalNumber(float: 0.0) {
        return "GET" //or whatever you like really... maybe 'Free'
    } else {
        let numberFormatter = NSNumberFormatter()
        let locale = item.priceLocale
        numberFormatter.numberStyle = .CurrencyStyle
        numberFormatter.locale = locale
        return numberFormatter.stringFromNumber(price)
    }
}

Edit: Couple other things, when you specify your productArray a more 'Swifty' way of doing it is:

var productsArray = [SKProduct]()

and then in your didRecieveResponse, instead of looping through the products you can just set productsArray as response.products

var productsArray = [SKProduct]()
    if response.products.count != 0 {

        print("\(response.products.map {p -> String in return p.localizedTitle})")
        productsArray = response.products

    }

Edit: To test for a number of different locales I usually make an array of NSLocales and then loop through printing the result. There is a repo with all the localeIdentifiers's here

so:

let testPrice = NSDecimalNumber(float: 1.99)
let localeArray = [NSLocale(localeIdentifier: "uz_Latn"),
    NSLocale(localeIdentifier: "en_BZ"),
    NSLocale(localeIdentifier: "nyn_UG"),
    NSLocale(localeIdentifier: "ebu_KE"),
    NSLocale(localeIdentifier: "en_JM"),
    NSLocale(localeIdentifier: "en_US")]
    /*I got these at random from the link above, pick the countries
    you expect to operate in*/

    for locale in localeArray {
        let numberFormatter = NSNumberFormatter()
        numberFormatter.numberStyle = .CurrencyStyle
        numberFormatter.locale = locale
        print(numberFormatter.stringFromNumber(testPrice))
    }

Swift 5 and 2021 version:

Create an extension to SKProduct so you can access product.localizedPrice conveniently:

extension SKProduct {

    private static let formatter: NumberFormatter = {
        let formatter = NumberFormatter()
        formatter.numberStyle = .currency
        return formatter
    }()

    var isFree: Bool {
        price == 0.00
    }

    var localizedPrice: String? {
        guard !isFree else {
            return nil
        }
        
        let formatter = SKProduct.formatter
        formatter.locale = priceLocale

        return formatter.string(from: price)
    }

}

Original Anser:

Swift 4.2 version of Olivier's answer

func priceStringForProduct(item: SKProduct) -> String? {
    let price = item.price
    if price == NSDecimalNumber(decimal: 0.00) {
        return "GET" //or whatever you like really... maybe 'Free'
    } else {
        let numberFormatter = NumberFormatter()
        let locale = item.priceLocale
        numberFormatter.numberStyle = .currency
        numberFormatter.locale = locale
        return numberFormatter.string(from: price)
    }
}

Simply you just need to do the following

product.priceLocale.currencyCode