iOS How do I make a modal view controller's presenter do something when the MVC is done?

I have two view controllers. I'll call them Amy and Bob, respectively. When Amy presents Bob, she uses a modal segue. Bob is supposed to be dismissed after a few seconds. When he is, Amy is supposed to do something.

I'm thinking about making Amy Bob's parent view controller so that I can tell Bob to call the "dismissViewController" method of his parentViewController object.

Edit: Thank you, dejo, for pointing me to the relevant Apple docs.

dejo said:

Have you read the View Controller Programming Guide for iOS, particularly the section on "Coordinating Efforts Between View Controllers"?

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Not yet, but I did read the section entitled "Presenting View Controllers from Other View Controllers." In there, it mentions that each view controller has a presentingViewController property that is set to the view controller that is presenting it.

Edit: After reading this page, I think I will use delegation.

Thanks for helping me. I ended up creating a delegate protocol, making Amy Bob's delegate, and having Bob call a method of Amy that is declared in the aforementioned delegate protocol.

dejo said:

P.S. It will probably help you get better recommendations if you were to elaborate on what you mean by "do something". Since what's being done might affect the way you want to handle this interaction.

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That is classified information. Besides, I think you would agree that having Amy do what I want done immediately after Bob finishes would be best.