Question

I find myself often writing complex GCD / block based methods (comparable to the code snippet shown below).

1. How would you break up this kind of method in smaller
   portions?

2. Would you rather GCD-enable the parsing methods in the managed
   objects’ code or would you rather keep the GCD code in the view
   controller?

3. How can I run the NSURL request in the code below in the background
   queue ([NSURLConnection sendAsynchronousRequest:request
queue:[NSOperationQueue mainQueue] When I use NSOperationQueue
currentQueue, the completion handler does not get called.

Answer 1

1. Use a C function or a instance method to delegate certain processes (such as saving to the XML file).

2. Definitely keep it in the object’s code. You are breaking MVC too much as it is,

3. Don’t use NSURLRequest, use AFNetworking or RestKit instead.