March 2010
Beginner
374 pages
10h 57m
English
Content preview from Learning iPhone ProgrammingBecome 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,
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.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.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.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.
Chapter 4. Coding in Objective-C
Thus far, you’ve built a simple iPhone application and discovered that it’s not that hard to build apps for the iPhone or iPod touch. Let’s step back and take a broader look at the Objective-C language.
Objective-C is an object-oriented language that adds Smalltalk-style messaging to C. The language is a superset of the C language, providing constructs to allow you to define classes and objects. Once you get the hang of the Smalltalk-style syntax, if you’ve programmed in an object-oriented language before, things should look fairly familiar. However, there are some differences, and I discuss them in this chapter. One of the bigger differences, especially for those who are coming from a Java background, is in how Objective-C deals with memory management.
Declaring and Defining Classes
As is the case in almost all other object-oriented languages, in Objective-C classes provide the building blocks to allow encapsulation of data and methods that act on that data. Objects are specific instances of a class, and they contain their own instance data and pointers to the methods implemented by the class. Classes are specified in two pieces: the interface and the implementation. The interface contains the declaration of the class and is normally contained in a .h file. The implementation contains your actual code (the definition) and is normally contained in a .m file. We briefly discussed this in Chapter 3, but let’s take some time to look at it in more detail ...
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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.