How to get currency symbol from currency code for all available locales in Swift?

Question

I have currency code (for example: "UAH"). In my code I get currency symbol equal currency code ("UAH"), but for "USD" and "EUR" - "$" and "€". Why?

let currencyCode = "UAH"

let localeComponents = [NSLocaleCurrencyCode: currencyCode]

let localeIdentifier = NSLocale.localeIdentifierFromComponents(localeComponents)

let locale = NSLocale(localeIdentifier: localeIdentifier)

let currencySymbol = locale.objectForKey(NSLocaleCurrencySymbol)

I found solution:

let locales: NSArray = NSLocale.availableLocaleIdentifiers()
for localeID in locales as! [NSString] {
    let locale = NSLocale(localeIdentifier: localeID as String)
    let code = locale.objectForKey(NSLocaleCurrencyCode) as? String
    if code == "UAH" {
        let symbol = locale.objectForKey(NSLocaleCurrencySymbol) as? String
    print(symbol!)
    break
    }
}

Answer 1

Because your locale wasn't set up correctly. The system knows nothing about your locale other than its currency code. There are two dozens or so locales with USD as the currency code; their currency symbols vary between US$ and $. UAH has 2 available locales: ru_UA and uk_UA.

A safer way is to iterate over all locales that have the same currency code as you have specified, then use a rule to pick from the resulting list:

let currencyCode = "UAH"

let currencySymbols = NSLocale
                        .availableLocaleIdentifiers()
                        .map { NSLocale(localeIdentifier: $0) }
                        .filter {
                            if let localeCurrencyCode = $0.objectForKey(NSLocaleCurrencyCode) as? String {
                                return localeCurrencyCode == currencyCode 
                            } else {
                                return false
                            }
                        }
                        .map {
                           ($0.localeIdentifier, $0.objectForKey(NSLocaleCurrencySymbol)!)
                        }

print(currencySymbols) // Now you can choose from the list