How to call method from one class in another (iOS)

Question

This a very basic question but I\'ve searched all over and been unable to find an answer that explains well enough for me to get my head around it.

What I want to do

Answer 1

You have to use the concept of delegation.

https://developer.apple.com/library/ios/#documentation/General/Conceptual/CocoaEncyclopedia/DelegatesandDataSources/DelegatesandDataSources.html