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

Using rawValue for the enum is one way of using types that can be stored in NSUserDefaults, define your enum to use a rawValue. Raw values can be strings, characters, or any of the integer or floating-point number types :

enum Environment: String {
    case Production = "Prod"
    case Staging    = "Stg"
    case Dev        = "Dev"
}

You can also create an enum instance directly using the rawValue (which could come from NSUserDefaults) like:

let env = Environment(rawValue: "Dev")

You can extract the rawValue (String) from the enum object like this and then store it in NSUserDefaults if needed:

if let myEnv = env {
    println(myEnv.rawValue)
}


func saveEnvironment(environment : Environment){
    NSUserDefaults.standardUserDefaults().setObject(environment.rawValue, forKey: kSavedEnvironmentDefaultsKey)
}