O'Reilly logo

Sams Teach Yourself Objective-C in 24 Hours, Second Edition by Jesse Feiler

Stay ahead with the world's most comprehensive technology and business learning platform.

With Safari, you learn the way you learn best. Get unlimited access to videos, live online training, learning paths, books, tutorials, and more.

Start Free Trial

No credit card required

Hour 18. Extending a Class with Categories and Extensions

What You’ll Learn in This Hour

Image Differentiating categories and protocols

Image Choosing when to use a category

Image Comparing categories and subclasses

Image Building and testing a category

Comparing Categories and Protocols

In Hour 17, “Extending a Class with Protocols and Delegates,” you saw how to specify ...

With Safari, you learn the way you learn best. Get unlimited access to videos, live online training, learning paths, books, interactive tutorials, and more.

Start Free Trial

No credit card required