November 2012
Beginner
480 pages
12h 18m
English
book
Learning Objective-C 2.0: A Hands-on Guide to Objective-C for Mac and iOS Developers, Second Edition
by Robert Clair
Content preview from Learning Objective-C 2.0: A Hands-on Guide to Objective-C for Mac and iOS Developers, Second EditionBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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13. Protocols
A protocol is a defined set of methods that a class can choose to implement. Protocols are useful when an object needs to talk to one or more other objects but doesn’t know (or particularly care about) the class of those other objects. Objective-C protocols are the equivalent of Java interfaces. In fact, the designers of Java borrowed the concept from Objective-C. Protocols are used throughout the Cocoa frameworks. Objective-C has both formal and informal protocols. A formal protocol declares a set of required methods and perhaps some optional methods. A class can then adopt the protocol by implementing all the protocol’s required methods. When a class declares that it adopts a formal protocol, the compiler checks to see that the ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.