Setting Up Delegates in iOS

This is copied from the iOS Apprentice tutorial on raywenderlich.com but I wanted to put it where I could easily access it. These are the basic steps for setting up a delegate pattern between two objects, where object A is the delegate for object B, and object B will send messages back to A.

  1. Define a delegate protocol for object B
  2. Give object B an optional delegate variable. This variable should be weak
  3. Make object B send messages to its delegate when something interesting happens, such as the user pressing the Cancel or Done buttons, or when it needs a piece of information. You write delegate?.methodName(self, ...)
  4. Make object A conform to the delegate protocol. It should put the name of the protocol in its class line and implement the methods from the protocol.
  5. Tell object B the object A is now its delegate

 

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