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    Whilst this may theoretically answer the question, it would be preferable to include the essential parts of the answer here, and provide the link for reference. Commented Dec 25, 2014 at 9:58
  • I agree with Bart. If no one else will post a summary of all these methods, I will make one as soon as I understand and test them all. Commented Dec 25, 2014 at 10:35
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    @Ravul updated answer Commented Dec 25, 2014 at 15:01
  • I have up-voted your answer and thank you for this idea. I am just reading about Functional Reactive Programming and it seems a good idea. I think the answer to this question is an enumeration, with a few advantages, disadvantages and at least one conceptual diagram for the following 4 ways to approach the problem: 1) Reactive Cocoa 2) KVO 3) Delegate method and 4) Classical way of writing a View Controller. I will write it as soon as I test all of these methods if no one else does so before me. If in the meantime I find new ways, that is even better. Commented Dec 25, 2014 at 22:03