如何使用NSOperationQueue进行同步请求？

I newbie for developing the ios application, I am trying to connect https web server, I had faced issue I am not able to connect the self signed certficate, so I have searched net In that I have followed below given code its working fine. but its working asynchronous mode.so I need until complete the task wait and return the data.Please gave any idea?/I newbie for developing the ios application, I