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If you re familiar with programming in C or similar languages, you may recognize main.m in the Other Sources group as the starting point of the application.
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Main.m
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Everything that happens between the main function and the HelloWorldAppDelegate class is behind the scenes magic of the iPhone SDK, over which you have no control. Since you ll hardly ever need to change main.m, you can safely ignore its contents. Still, it never hurts to peek inside. To quickly sum up, the main function creates an NSAutoreleasePool and then calls UIApplicationMain to start the application using HelloWorldAppDelegate as the class that implements the UIApplicationDelegate protocol.
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int main(int argc, char *argv[]) { NSAutoreleasePool *pool = [NSAutoreleasePool new]; int retVal = UIApplicationMain(argc, argv, nil, @"HelloWorldAppDelegate"); [pool release]; return retVal; }
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Really, the only interesting point to take away from this is that every iOS application uses an NSAutoreleasePool to help you manage memory. In short, by using the autorelease message on objects, you don t have to worry about sending them a release message. The autorelease pool ensures that the memory of autorelease objects is eventually released.
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CHAPTER 2: Getting Started
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Don t worry if you don t know what the heck I m talking about here. I ll introduce you to memory management with cocos2d later in this chapter and it ll become clearer why every iOS application is wrapped inside an NSAutoreleasePool.
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Precompiled Prefix Header
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Just in case you re wondering what the HelloWorld_prefix.pch header file is for, it s a tool used to speed up compilation. You are supposed to add the header files of frameworks that never or only rarely change to the prefix header. This causes the framework s code to be compiled in advance and made available to all your classes. Unfortunately, it also has the disadvantage that, if a header added to the prefix header changes, all your code will recompile, which is why you should only add header files that rarely or never change. For example, the cocos2d.h header file is a good candidate to add to the prefix header, as I ve done in Listing 2 1. To create a noticeable increase in compilation time, your project would need to be reasonably complex, however, so don t get your stopwatch out just yet. But it s good practice to add the cocos2d.h as a prefix header right away, if only to never have to write #import cocos2d.h in any of your source files again.
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Listing 2 1. Adding the cocos2d.h Header File to the Prefix Header #ifdef __OBJC__ #import <Foundation/Foundation.h> #import <UIKit/UIKit.h> #import "cocos2d.h" #endif
Once again, you can refer to Apple s developer documentation if you want to learn more about reducing build times with prefix headers: http://developer.apple.com/mac/library/documentation/DeveloperTools/Conceptual/ XcodeBuildSystem/800-Reducing_Build_Times/bs_speed_up_build.html.
Classes
There are two classes that make up the core of the HelloWorld project. The HelloWorldAppDelegate class handles the application s global events and state changes, while the HelloWorldScene class contains all the code that displays the Hello World label.
HelloWorldAppDelegate
Every iOS application has one AppDelegate class that implements the UIApplicationDelegate protocol. In our HelloWorld project, it s called HelloWorldAppDelegate, and that naming scheme is the same for every new project you re going to create: project name plus AppDelegate. I m going to refer to it simply as the AppDelegate from now on because it s a global concept you ll find in every iOS application.
CHAPTER 2: Getting Started
The AppDelegate is used to track state changes of the application, and to do this it receives messages from the iOS at certain points in time. For example, it allows you to determine when the user gets an incoming phone call or when the application is low on memory. The very first message your application will receive is the applicationDidFinishLaunching method. That s where all the startup code goes and where cocos2d is initialized. If you want to learn more about the AppDelegate s various methods, what they do and when these messages are sent by the iPhone SDK, you can look it up in Apple s reference documentation on the UIApplicationDelegate protocol at http://developer.apple.com/iphone/library/documentation/uikit/reference/UIAppli cationDelegate_Protocol. NOTE: Since I m talking about application startup, I might as well talk about application shutdown. You may eventually notice an oddity with the AppDelegate s dealloc method. It never gets called! Any breakpoint set in the AppDelegate dealloc method will never be hit! This is normal behavior. When iOS terminates an application, it simply wipes the memory clean to speed up the shutdown process. That s why any code inside the dealloc method of the AppDelegate class is never run. Also, it s bad practice to call dealloc manually so don t try to fix this issue by doing so. If you ever need to run code in your AppDelegate just before the application terminates, do it inside the applicationWillTerminate method. If you target iOS 4 or higher, you should use applicationDidEnterBackground instead. In most cases, there are only three things you might want to change during the cocos2d initialization process:
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