Cocoa - Return information from NSOperation

Question

I have an IPhone app that uses webservices to get data from a server. I\'m putting each call to the webservice in a NSOperation subclass so that it can be threaded. My questio

Answer 1

The doc says it's better to make the operation member variable when you want get the result from operation. But I do not think the solution will adapt you.

I think notification is good and There is another way to get the result is make a completion block for your own operation.See here: Return data from NSOperation? I tried it's work well.

I tried another way before.set the operation completion block,and make a weak reference to operation and make the result an property of operation. so you can get the operation result when you finished.

But completion is not reliable,when you cancel the operation the completion excuted too. so choose the best for you.