title: iOS AsyncSocket to notify to two UIViewController
body: <p>I am using AsyncSocket for a TCP connection.<br>
  I have one TCP socket, but I have two UIViewControllers use this socket.<br>
  As I know, there is only one delegate while I init the AsyncSocket.<br>
  These two UIViewControllers both need to handle the callback from the AsyncSocket.<br>
  Is there any good idea to achieve this?<br>
  Any idea is appreciated! </p>