import Foundation
import Alamofire
import UIKit
import SwiftyJSON

class APIClient: UIViewController {

    let loggedIn = false
    struct Constants{
        static let Domain = "http://gogogo.com"
    }

    func authenticate() -> Bool{
        println("Authenticating")
        if let access_token = FBSDKAccessToken.currentAccessToken().tokenString {
            let parameters = [ "access_token": access_token ]
            Alamofire.request(.POST, Constants.Domain+"/accounts", parameters: parameters).responseJSON {
            (req, res, json, error) in
                if(error != nil) {
                    self.sendReturnToSplash()
                } else {
                    let json = JSON(json!)
                    println("\(json)")
                    return true //This doesn't work!!!!!!
                }
            }
        }else{
            println("No access token to authenticate")
        }
    }

    func sendReturnToSplash(){
        let center = NSNotificationCenter.defaultCenter()
        let notification = NSNotification(name: NotificationCenters.ReturnToSplash, object: self, userInfo: ["":""])
        center.postNotification(notification)
    }
}

Como puede ver, si el cierre de sesión es exitoso, quiero devolver "verdadero". Sin embargo, XCode me da un "vacío no se ajusta al protocolo BooleanLiteral"