November 2013
Beginner
325 pages
9h 47m
English
Content preview from Objective-C Programming: The Big Nerd Ranch Guide
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Inheritance hierarchy
All objects inherit (either directly or indirectly) from NSObject:
Figure 20.3 Inheritance diagram of some classes you know
NSObject has many methods but only one instance variable: the isa pointer. Every object’s isa pointer points at the class that created it. (Get it? When you have a BNRPerson instance, that object “is a” BNRPerson. When you have an NSString instance, that object “is a[n]” NSString.)
Figure 20.4 Every object knows which class created it
When you send a message to an object, ...
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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.
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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.