How can I store a Swift enum value in NSUserDefaults

Question

I have an enum like this:

enum Environment {
    case Production
    case Staging
    case Dev
}

And I\'d like to save an instance in NSUserDef

Answer 1

Swift 5.1 You can create property wrapper for this

@propertyWrapper final class UserDefaultsLanguageValue {
    var defaultValue: LanguageType
    var key: UserDefaultsKey

    init(key: UserDefaultsKey, defaultValue: LanguageType) {
        self.key = key
        self.defaultValue = defaultValue
    }

    var wrappedValue: LanguageType {
        get { LanguageType(rawValue: UserDefaults.standard.object(forKey: key.rawValue) as? String ?? defaultValue.rawValue) ?? .en }
        set { UserDefaults.standard.set(newValue.rawValue, forKey: key.rawValue) }
    }
}

enum UserDefaultsKey: String {
    case language
}

enum LanguageType: String {
    case en
    case ar
}

And use it just like that

@UserDefaultsLanguageValue(key: .language, defaultValue: LanguageType.en) var language