How to write an Objective-C Completion Block

Question

I\'m in a situation where need to call a class method from my view controller, have it do it\'s thing, but then perform some actions ONLY AFTER the class method has complete

Answer 1

I always use this when I want to write a block:

http://fuckingblocksyntax.com

EDIT

If you are writing Swift then use this:

http://fuckingswiftblocksyntax.com

If the above links are not opening because of the obscene language, use this one.

http://goshdarnblocksyntax.com/