I don’t understand the concept of delegation is used in XCode. When a new project is created, an app delegate and a view controller are created, but what does the app delegate do? How does main.m know to call the delegate?
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I don’t understand the concept of delegation is used in XCode. When a new project is created, an app delegate and a view controller are created, but what does the app delegate do? How does main.m know to call the delegate?
main.mdoesn’t call the delegate. The application object does that at runtime to let you customize the behaviour of your application without needing to subclass or do any other funny business. Delegation a pretty common feature of the Apple frameworks; reading their documentation or the Wikipedia page on delegation might be good choices to learn more.