Bay Area Girl Geek 4: Amanda Wixted

game programming in objective-c amanda wixted

inspiration

PAC-MAN (Namco) Maﬁa Wars (Zynga) my ﬁrst and most recent iPhone games

ﬁrst program i witnessed

Live Poker (Zynga) social casual games iphone games -for people to play -in your pocket all the time online against their -average session is about 7 to real-life friends 15 minutes -for people to pick up -we use facebook connect and have fun for 15 and our own social gaming minutes net

the general structure of casual games main paint update background sky’s asteroids color objects ship’s positions in view position set ﬂags AI’s heads in the data creatures’ next up display models reactions to move player’s actions I/O

main main loop of a paint update casual game create a timer that calls your method at <framerate> hz main loop updates the data models then draws to screen

(demo of Penguin Madness)

what’s cool about Objective-C? a few topics that differentiate objc from other OO languages: get over the brackets :-] memory management model @synthesized instance variables categories

get over the [ ]’s this is the ﬁrst thing people complain about when they see objc code brackets mean you are sending a message to an object at runtime which is slightly different from calling a function on it. this lets you not have to worry about the type of object at compile time. that’s all, so don’t worry :-]

memory management • objects have methods called “retain” and “release” • objects have a retainCount; when it becomes 0, the runtime deallocates the object • if you allocate memory for an object, you “own” it so you need to release it • if you did not allocate, don’t call release

@properties • properties provide access to instance variables in a class • using @synthesize auto-generates getters and setters, depending on keywords you give it • saves you time!

categories • add methods to a class • can override original without having to implementation if you subclass don’t like how it worked • can’t declare new ivars, but can access private ones • allows you to implement a class over several ﬁles

objc and gaming blogs furbo.org - craig hockenberry (Twitterrifﬁc) on objc, Xcode, iPhone programming cocoawithlove.com - matt gallagher - objc, cocoa, hints/tips/cookbook toucharcade.com - iphone game reviews stackoverﬂow.com - collaborative Q&A about programming (you already hang out here :)

contact info amanda.wixted@gmail.com http://amandawixted.com @commanda on twitter zynga is hiring awesome engineers of all types! http://zynga.com/jobs/

Bay Area Girl Geek 4: Amanda Wixted

by Amanda Wixted on Jun 13, 2009

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Bay Area Girl Geek 4: Amanda Wixted — Presentation Transcript