How to pass data between UIViewControllers with protocols/delegates

Question

In the code below I have a ViewController(\"SenderViewController\"), which passes a message to the main ViewController when a button is tapped. Wha

Answer 1

Objects don't exactly listen for method calls. They sit there, waiting to invoked.

The line

self.delegate?.messageData(inputMessage.text!)

From your SenderViewController is a function call. (The term method and function are pretty much interchangeable, although the method is usually used for the functions of objects.) It invokes the function messageData in ViewController.