NSLocale Swift 3

Question

How do I get the currency symbol in Swift 3?

public class Currency: NSObject {
    public let name: String
    public let code: String
    public var symbol: String {
        return NSLocale.currentLocale().displayNameForKey(NSLocaleCurrencySymbol, value: code) ?? ""
    }

    // MARK: NSObject

    public init(name: String, code: String) {
        self.name = name
        self.code = code
        super.init()
    }
}

I know NSLocale got renamed to Locale, but displayNameForKey got removed and I only seem to be able to use localizedString(forCurrencyCode: self.code) to generate the name of the currency in the current locale without being able to get its symbol. I'm looking for a way to get a foreign currency symbol in a current locale.

Or am I overlooking something?

Answer 1

NSLocale was not renamed, it still exists. Locale is a new type introduced in Swift 3 as a value type wrapper (compare SE-0069 Mutability and Foundation Value Types).

Apparently Locale has no displayName(forKey:value:) method, but you can always convert it to its Foundation counterpart NSLocale:

public var symbol: String {
    return (Locale.current as NSLocale).displayName(forKey: .currencySymbol, value: code) ?? ""
}

More examples:

// Dollar symbol in the german locale:
let s1 = (Locale(identifier:"de") as NSLocale).displayName(forKey: .currencySymbol, value: "USD")!
print(s1) // $

// Dollar symbol in the italian locale:
let s2 = (Locale(identifier:"it") as NSLocale).displayName(forKey: .currencySymbol, value: "USD")!
print(s2) // US$