Swift中的FBGraphUser

Question

我使用Facebook的iOS SDK中斯威夫特访问Facebook和我愿与工作FBGraphUser(或FBGraphPlace,FBGraphLocation)协议,而不是一个纯粹的Dictionary.请求成功完成但我无法将结果转换为FBProtocol

FBRequestConnection.startForMeWithCompletionHandler { (connection: FBRequestConnection!, result: AnyObject!, error: NSError!) -> Void in
     // this does not work
    if let fbGraphUser = result as? FBGraphUser {
        NSLog("\(fbGraphUser)")
    }

     // this works
    if let fbGraphUserDict = result as? Dictionary<String, AnyObject>{
        println("\(fbGraphUserDict)")
    }
}

我该怎么解开选项以获取FBxxxx对象？

干杯