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iPhone Development

iPhone Development. JaxCodeCamp 2009. Who am I. David Fekke .NET Developer, ColdFusion Work at LPS Presenter JaxDug, JaxJug, JSUG & JaxFusion Mac User 1986. Alan Kay. Smalltalk is object-oriented, but it should have been message oriented. Alan Kay.

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iPhone Development

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  1. iPhone Development • JaxCodeCamp 2009

  2. Who am I • David Fekke • .NET Developer, ColdFusion • Work at LPS • Presenter JaxDug, JaxJug, JSUG & JaxFusion • Mac User 1986

  3. Alan Kay • Smalltalk is object-oriented, but it should have been message oriented.

  4. Alan Kay • When I invented the term Object-Oriented, and I can tell you I did not have C++ in mind.

  5. Bjarne Stroustrup • C makes it easy to shoot yourself in the foot; C++ makes it harder, but when you do, it blows away your whole leg.

  6. The Apple Way

  7. Assumptions • Somewhat familiar with OO concepts • Used a language like Java, C# or C++ • Open minded • Actually used an iPhone or iPod Touch

  8. Requirements • You need a Intel Mac with OX 10.5 • Some knowledge of OO concepts • Xcode tools (FREE) • iPhone (SDK)

  9. Developer Programs • iPhone Individual ($99) • iPhone Enterprise ($399) • iPhone Student

  10. App Store • Submit Apps with Individual program • Apple keeps 30%, you keep 70% • Refunds: you pay 100%

  11. iPhone Platform • ARM Processor • 128/256 MB RAM • BSD UNIX • Mach Microkernel • COCOA APIs

  12. COCOA • COCOA is a OO Framework • Based on NextStep • Mostly written in Objective-C • iPhone uses COCOA Touch

  13. COCOA Framework • NS (NextStep) • CF (Core Foundation) • CA (Core Animation) • CI (Core Image) • Core Data • OpenGL

  14. COCOA Conventions • Most classes begin with NS, I.E. NSObject, NSString, NSArray or NSNumber • Designed around MVC pattern • Heavy use of delegation • iPhone specific components based on UIKit

  15. COCOA Touch APIs • Accelerometer • Location API • Multi-Touch • Camera/Video Input • Map Interface • OpenGL ES

  16. Objective-C • Somewhere in-between C++ and Java • Invented in 1980’s for Next Computing • Based on C with SmallTalk like extentions • Used in COCOA, OpenStep and GNUStep • Class based OO language

  17. -(BOOL)validateNumRangeWithStartNumber:(int)startNumber EndNum:(int) endNumber • { • if (startNumber >= endNumber) • { • UIAlertView *alertView = [[UIAlertView alloc] • initWithTitle:@"End value Too Small" • message:@"Sorry" • delegate:nil • cancelButtonTitle:@"OK" • otherButtonTitles:nil]; • [alertView show]; • [alertView release]; • return YES; • } else { • return NO; • } • }

  18. Obj-C vs C#

  19. Objective-C Structure • Obj-C Class composed of two files: header and implementation, or .h and .m • header uses the @interface and implementation uses @implementation

  20. #import <UIKit/UIKit.h> @interface LottoRandomAppDelegate : NSObject <UIApplicationDelegate> { UIWindow *window; } @property (nonatomic, retain) IBOutletUIWindow *window; @end

  21. #import "LottoRandomAppDelegate.h" @implementation LottoRandomAppDelegate @synthesize window; - (void)applicationDidFinishLaunching:(UIApplication *)application { // Override point for customization after application launch [windowmakeKeyAndVisible]; } - (void)dealloc { [windowrelease]; [superdealloc]; } @end

  22. Selectors • SEL type defines a method signature • -(void)setAction:(SEL)aSelector • SEL mySelector; • mySelector = @selector(drawMyView:); • [myButton setAction:mySelector];

  23. Memory Management • C used methods like malloc and free • Obj-C uses object retain pool • Garbage Collection on the Mac, but not on the iPhone • Inherit management methods from NSObject

  24. Memory Management Cont. • NSString *myName = [[NSString alloc] init]; • // retain count of 1 • [myName retain]; • // retain count of 2 • [myName release]; • // retain count reduced to 1 • [myName autorelease]; • // object released by pool magically

  25. MVC • Model-View-Controller • COCOA has Controller classes • UIViewController Class • Views are in the XIB (NIB) files

  26. Controllers • iPhone Apps commonly have multiple views • Push and Pop the Controllers for each View • Navigation Controller used to load different views • UINavigationController

  27. SDK Tools • Xcode 3.0 IDE • Interface Builder (Views) • Instruments (Profiler tool) • iPhone Simulator

  28. Xcode 3 • GCC compiler 4.2 • Support for Obj-C, C++, Java, Python and Ruby (iPhone only uses Obj-C & C++) • Code editor with code completion • Support for SVN and CVS

  29. Interface Builder • Tool for laying out interfaces • Separate Tool from Xcode • Bind Actions and Outlets in Controllers

  30. Demo

  31. Internet Resources • http://developer.apple.com • http://developer.apple.com/iphone/library/documentation/Cocoa/Conceptual/ObjectiveC/ • http://www.stanford.edu/class/cs193p/cgi-bin/index.php • http://www.cocoadev.com/

  32. Book Resources • COCOA Programming For Mac OS X by Aaron Hillegass • iPhone Developer’s Cookbook by Erica Sadun • APress Books

  33. Snow Leopard • Mac OS X 10.6 released yesterday • Optimized for 64bit • Xcode 3.2 • Static Analysis Code warning and hinting • OpenCL Library • Grand Central Dispatch

  34. Mono Touch • Develop iPhone Apps with C# • Mono IDE • Ahead of time compilation • Works with IB

  35. Contact • davidfekke@gmail.com • twitter.com/davidfekke • http://www.fekke.com/blog/

  36. Questions?

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