如何在swift中将json字典分配给NSDictionary

Question

我想在swift中调用简单的SOAP Web服务并将响应分配给NSDictionary

//Making Connection
    let stringURL="http://www.xxxxx.com/mobileapp/category.php"
    let url1: NSURL = NSURL(string: stringURL )!
    let request: NSURLRequest = NSURLRequest(URL: url1)
    let connection:NSURLConnection = NSURLConnection(request: request, delegate: self, startImmediately: false)!
    connection.start()

但我不清楚如何在swift中编写连接委托 我应该在这些代表下写些什么？

func connection(connection: NSURLConnection!, didReceiveData data: NSData!)
func connectionDidFinishLoading(connection: NSURLConnection!)

我的回复是一本词典。如何在我的应用程序端将其分配给NSDictionary？ 请帮我。