Swift Programming: The Big Nerd Ranch Guide

Adding an Objective-C Class

Now that you have interoperated from Objective-C to Swift, your next task is to interoperate from Swift to Objective-C. You will create a new Objective-C class to make a default image for new contacts. Your Swift class NewContactViewController will use this new Objective-C class. This simulates a fairly common reality: an existing Mac or iOS project will often have a number of Objective-C classes that are needed in the Swift components of the project.

Create a new Objective-C file that is a Cocoa Touch Class and call it DefaultImage. Its job will be to create a new contact’s default image. Make this new class a subclass of NSObject. Be sure to select Objective-C as the language for this class.

Before ...