Download Cocoa and Objective-C: Up and Running: Foundations of Mac, by Scott Stevenson PDF

By Scott Stevenson

Construct strong purposes for Mac OS X, iPhone, and iPod contact, whether you will have simple programming talents or years of programming event. With this publication, you'll find out how to use Apple's Cocoa framework and the Objective-C language via step by step tutorials, hands-on routines, transparent examples, and sound suggestion from a Cocoa expert.

Cocoa and Objective-C: Up and Running deals barely enough conception to flooring you, then exhibits you the way to exploit Apple's speedy improvement instruments -- Xcode and Interface Builder -- to enhance Cocoa functions, deal with consumer interplay, create nice UIs, and extra. You'll quick achieve the event you must advance refined Apple software program, no matter if you're slightly new to programming or simply new to this platform.

Get a short hands-on travel of uncomplicated programming talents with the C language
* how to use Interface Builder to quick layout and prototype your application's person interface
* begin utilizing Objective-C via growing items and studying reminiscence management
* know about the Model-View-Controller (MVC) approach to sharing facts among objects
* comprehend the basis worth periods, Cocoa's powerful API for storing universal facts types
* get to grips with Apple's pictures frameworks, and how one can make customized perspectives with AppKit

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The compiler converts source code into working programs. When you click Build in the toolbar, Xcode uses the compiler to do a lot of the lowlevel work. Besides abstracting a lot of these tedious details, Xcode also packages up the program as a proper Mac app. If you write a line of Xcode that isn’t correct, Xcode will display an error when you try to build. You won’t be able to run your app until you fix the error. These kinds of mistakes are known as build errors (Figure 2-2). Figure 2-2. A build error in Xcode Even the best programmers make mistakes like this every day, but many are easy to fix.

You can also make functions that take multiple input values. You separate input values with commas: int difference ( int input1, int input2 ) { return input1 - input2; } Here’s how to use this function: int originalCount = 100; int itemsSold = 10; // currentStock will contain the value 90 int currentStock = difference ( originalCount, itemsSold ); The example code has a line of descriptive text with two slashes at the beginning. This is called a comment: // currentStock will contain the value 90 Software can get very complex, and comments help you explain to other people reading your code what various parts of the program do.

Your First Application | 13 Figure 1-16. Basic PDF generation and printing is built in 14 | Chapter 1: Setup and First Run CHAPTER 2 Thinking in Code: Basic C As a Cocoa programmer, your job is to get your ideas onto the screen. When you write an essay, you use sentences and paragraphs. Writing software works the same way, though you write lines of code instead. Each line performs a task, such as opening a file or displaying an image. When you put enough of these lines of code together, you eventually have an application.

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