在 PubNub Swift 中访问 PNMessageResult

请参阅此链接 http://www.pubnub.com/blog/realtime-ios-apps-getting-started-with-swift-and-pubnub/

基于以下功能我能够收到响应，

func client(client: PubNub!, didReceiveMessage message: PNMessageResult!) {
println(message)

但是，我只能以 PNMessageData 格式的 message.data 形式访问数据。

即使这样也会返回以下格式的数据：

{
message = "{}";
subscribedChannel = 123;
timetoken = 14392105288780634;}

如何访问 message.data(PNMessageData) 内的消息值？

我编写了简单的方法来解析 PNMessageResult

func client(_ client: PubNub, didReceiveMessage message: PNMessageResult) {

    //Message Received on Channel:
    let channel = message.data.channel

    //Message Received:
    guard let messageData = message.data.message as? [String : AnyObject] else { return }

    //Event:
    guard let event:String = messageData["event"] as? String 

    let data:AnyObject = messageData["data"] else { return }

    guard let dict = data as? NSDictionary else { fatalError("Couldn't parse pubnub message") }

    //This will be message in dictionary
    let mutableDict = dict.mutableCopy() as! NSMutableDictionary

}