Swift reflection, map object from json [on hold]

I know that there are libraries that do this, I think that is a way much easier to accomplish (in terms of implementation).

i.e. ObjectMapper

With this lib you need to set a method map and then the properties that would be mapped I want to accomplish this without setting the method map, just do the same way that would be with C#

i.e. WSD.Data

What I mean? just want to do this way

public class User : Mapper
{
  username: String
  email: String
  picture: File // a custom class
}

var jsonString: String = "{\"username\": \"myUsername\", \"email\": \"my@email.com\", \"picture\": {\"url\": \"http://ift.tt/1B9TKWn\"}}"
User().set(jsonString)

can be or not exactly this way, but just set the object with properties and then with a method map the json to the object, maybe we can pass the json string in the constructor.

I'm just experimenting with this

public class Mappable : NSObject { func Map () -> [String: String] { return String: String }

public func Set (JSONString: String)
{
    // Now get the mapped fields
    var mapped: [String: String] = Map()

    println(NSStringFromClass(self.dynamicType).componentsSeparatedByString("."))

    var error : NSError?
    let JSONData = JSONString.dataUsingEncoding(NSUTF8StringEncoding, allowLossyConversion: false)
    let JSONDictionary: Dictionary = NSJSONSerialization.JSONObjectWithData(JSONData!, options: nil, error: &error) as NSDictionary

    for (key, value) in JSONDictionary {
        var keyName = key as String

        if  self.respondsToSelector(NSSelectorFromString(mapped[keyName])) {
            keyName = mapped[keyName]!
        }

        // If property exists
        if self.respondsToSelector(NSSelectorFromString(keyName)) {
            if (self[keyName] is Mappable) { // Here don't know how to check the property type, so I can cast
                var err: NSError?
                (self[keyName] as Mappable).Set(NSJSONSerialization.dataWithJSONObject(value, options:NSJSONWritingOptions(0), error: &err))
            } else {
                println("property: " + keyName)
                self.setValue(value, forKey: keyName)
            }
        } else {
            println("no property " + keyName)
        }
    }
}

}

This prototype also lack recursion..