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

If you would like to save/read data from UserDefaults and separate some logic, you can do it in following way (Swift 3):

enum Environment: String {
    case Production
    case Staging
    case Dev
}

class UserDefaultsManager {

    static let shared = UserDefaultsManager()

    var environment: Environment? {
       get {
           guard let environment = UserDefaults.standard.value(forKey: kSavedEnvironmentDefaultsKey) as? String else {
               return nil
           }
           return Environment(rawValue: environment)
       }
       set(environment) {
           UserDefaults.standard.set(environment?.rawValue, forKey: kSavedEnvironmentDefaultsKey)
       }
    }
}

So saving data in UserDefaults will look this way:

UserDefaultsManager.shared.environment = Environment.Production

And reading data, saved in UserDefaults in this way:

if let environment = UserDefaultsManager.shared.environment {
    //you can do some magic with this variable
} else {
    print("environment data not saved in UserDefaults")
}