Learn about one of the most commonly used design patterns in Objective-C: protocols and delegates.
21 Mar 20172 Sep 2016 Ray Wenderlich’s tutorial on Protocol Oriented Programming Note: This tutorial requires Xcode 7 and Swift 2, which will be in beta until this
Objective-C allows you to define protocols, which declare the methods expected to be used for a particular situation. Protocols are implemented in the classes conforming to the protocol. The methods under keyword @required must be implemented in the classes that conforms to the
16 Feb 2016 Choose Objective-C file. (At the bottom of the page it states “An empty Objective-C file, category, protocol, or extension.” This is the one you