iPhone development: A brief introduction

ACCU 2010 iPhone development a brief introduction pete goodliffe Hello, iPhone world! Development a brief introduction Pete Goodliffe pete@goodliffe.net

iPhone development a brief introduction pete goodliffe Pete Goodliffe A programmer, a columnist, an author, a teacher. Someone who cares about code. www.goodliffe.net goodliffe.blogspot.com @petegoodliffe

iPhone development a brief introduction pete goodliffe talk synopsis An introduction to iPhone development An introduction to iPhone development for beginners or those who are casually interested and want a leg up the learning curve. This talk is an overview of how to get started as an iPhone developer, and an introduction to the core technologies, including: ‣ Common iPhone/Mac OS design patterns, idioms, and practices ‣ Becoming a native: how to "think in iPhone" ‣ Overview of the libraries and facilities that exist ‣ Limitations of the development environment

iPhone development a brief introduction pete goodliffe 90 minutes? is that all?!!!

iPhone development a brief introduction pete goodliffe in 90 minutes... Demo Intro ‣ Intro ‣ The tools Tips ‣ The language Tools ‣ The UI ‣ Key technologies ‣ Deploying Further info ‣ Further info Language ‣ Tips and tricks Deploying ‣ The demo UI Technologies m… pie Mm

iPhone development a brief introduction pete goodliffe in 90 minutes... Demo Intro ‣ Intro Introduction ‣ The tools Tips ‣ The language Tools ‣ The UI ‣ Key technologies ‣ Deploying Further info ‣ Further info Language ‣ Tips and tricks Deploying ‣ The demo UI Technologies

iPhone development a brief introduction pete goodliffe who are you?

iPhone development a brief introduction pete goodliffe why develop for the iPhone?

iPhone development a brief introduction pete goodliffe the alternatives

iPhone development a brief introduction pete goodliffe in 90 minutes... Demo Intro ‣ Intro ‣ The tools Tips ‣ The language Tools ‣ The UI ‣ Key technologies ‣ Deploying Further info ‣ Further info Language ‣ Tips and tricks Deploying ‣ The demo UI Technologies

iPhone development a brief introduction pete goodliffe in 90 minutes... Demo Intro ‣ Intro The tools ‣ The tools Tips Tools ‣ The language ‣ The UI ‣ Key technologies ‣ Deploying Further info ‣ Further info Language ‣ Tips and tricks Deploying ‣ The demo UI Technologies

iPhone development a brief introduction pete goodliffe ❖ The cast ❖ Xcode iPhone/iPod Touch/iPad Interface builder iPhone simulator Instruments/Shark Other tools

iPhone development a brief introduction pete goodliffe Xcode

iPhone development a brief introduction pete goodliffe

iPhone development a brief introduction pete goodliffe an iPhone

iPhone development a brief introduction pete goodliffe Interface Builder

iPhone development a brief introduction pete goodliffe iPhone simulator

iPhone development a brief introduction pete goodliffe Instruments/Shark

iPhone development a brief introduction pete goodliffe Other tools

iPhone development a brief introduction pete goodliffe Getting set up... Get a Mac Get the tools Install Get an ADC account $$$ Code … Profit

iPhone development a brief introduction pete goodliffe in 90 minutes... Demo Intro ‣ Intro ‣ The tools Tips Tools ‣ The language ‣ The UI ‣ Key technologies ‣ Deploying Further info ‣ Further info Language ‣ Tips and tricks Deploying ‣ The demo UI Technologies

iPhone development a brief introduction pete goodliffe in 90 minutes... Demo Intro ‣ Intro The language ‣ The tools Tips ‣ The language Tools ‣ The UI ‣ Key technologies ‣ Deploying Further info ‣ Further info Language ‣ Tips and tricks Deploying ‣ The demo UI Technologies

iPhone development a brief introduction pete goodliffe (well, languages) C C++ Objective-C

iPhone development a brief introduction pete goodliffe a history of objective-c in 14 lines and 12 words (give or take)

iPhone development a brief introduction pete goodliffe algol CPL Simula BCPL Smalltalk B C Objective-C C++ Java C# D

iPhone development a brief introduction pete goodliffe objective C is... dynamic based on message passing follows C compilation model full of [ ] and @s ot too n - (id) thisIsAMethod:(int)param1 ry! signatute:(float)param2 sca { for (int n (brace n < 10; ++n) = 0; yourself) { NSLog(@”N=%d”, n); [object callMethod:1 thing:2]; } }

iPhone development a brief introduction pete goodliffe .m file @implementation MyClass - (id) thisIsAMethod:(int)param1 signatute:(float)param2 { for (int n = 0; n < 10; ++n) { NSLog(@”N=%d”, n); [object callMethod:1 thing:2]; } } @end

iPhone development a brief introduction pete goodliffe @implementation MyClass - (id) thisIsAMethod:(int)param1 @class signatute:(float)param2 { @interface @implementation for (int n = 0; n < 10; ++n) { @end NSLog(@”N=%d”, n); @property [object callMethod:1 thing:2]; @private } } @protected @end

iPhone development a brief introduction pete goodliffe @implementation MyClass - (id) thisIsAMethod:(int)param1 signatute:(float)param2 { for (int n = 0; n < 10; ++n) { NSLog(@”N=%d”, n); [object callMethod:1 thing:2]; } } @end

iPhone development a brief introduction pete goodliffe @implementation MyClass - (id) thisIsAMethod:(int)param1 signatute:(float)param2 C an { stil l C fr write for (int n = 0; n < 10; ++n)ee func (and c tion all) { s NSLog(@”N=%d”, n); [object callMethod:1 thing:2]; } } @end

iPhone development a brief introduction pete goodliffe @implementation MyClass - (id) thisIsAMethod:(int)param1 signatute:(float)param2 { for (int n = 0; n < 10; ++n) { NSLog(@”N=%d”, n); NSS [object callMethod:1 thing:2]; tri } ng } @end

iPhone development a brief introduction pete goodliffe @implementation MyClass - (id) thisIsAMethod:(int)param1 signatute:(float)param2 { for (int n = 0; n < 10; ++n) { NSLog(@”N=%d”, n); [object callMethod:1 thing:2]; } } @end

iPhone development a brief introduction pete goodliffe @implementation MyClass - (id) thisIsAMethod:(int)param1 signatute:(float)param2 { for (int n = 0; n < 10; ++n) { NSLog(@”N=%d”, n); [object callMethod:1 thing:2]; } Can } call nil @end

iPhone development a brief introduction pete goodliffe Sending messages [object method]; int i = [object method]; [[object method1] method2]; [object method:10]; [object1 method:[object 2:method]];

iPhone development a brief introduction pete goodliffe Method names parameters object [circle setCenterAtX:(float)x y:(float)y]; method name method name is: setCenterAtX:y: SEL s = @selector(setCenterAtX:y:); [circle performSelector:s];

iPhone development a brief introduction pete goodliffe parameter types: int, float, unsigned, etc syntax: (return type) id

iPhone development a brief introduction pete goodliffe .h file @class ForwardDeclaration; @interface MyClass : NSObject { ForwardDeclaration *member; bool otherMember; } - (void) init; - (id) initWithItems:(NSArray*)array enabled:(bool)enabled; + (id) myClassWithItems:(NSArray*)array; @end

iPhone development a brief introduction pete goodliffe @class ForwardDeclaration; @interface MyClass : NSObject { ForwardDeclaration *member; bool otherMember; } - (void) init; - (id) initWithItems:(NSArray*)array enabled:(bool)enabled; + (id) myClassWithItems:(NSArray*)array; @end

iPhone development a brief introduction pete goodliffe Objective C++ In .mm files Classes can contain C++ objects May use in functions You can use RAII C++ libraries

iPhone development a brief introduction pete goodliffe Properties @interface MyClass { int harold; } @property (nonatomic,assign) int harold; @end In MyClass.m... @interface MyClass @synthesize harold; @end This will become important when we look at creating UIs

iPhone development a brief introduction pete goodliffe The tao of objects You don’t call methods You pass messages to objects [theObject sendMessage:parameter];

iPhone development a brief introduction pete goodliffe Java, C++, C# object.myMethod(1066); MyClass myMethod(int) MyClass *this another() more() class MyClass { private data public myMethod(int i) { // ... } };

iPhone development a brief introduction pete goodliffe Objective-C [object myMethod:1066]; MyClass message (selector) MyClass *self myMethod(int) another() @implementation MyClass - (void) myMethod:(int)i private data { // ... } @end

iPhone development a brief introduction pete goodliffe Categories @interface NSObject (Foo) - (void) extraFooMethod; @end NSArray *array = [NSArray array]; [array extraFooMethod];

iPhone development a brief introduction pete goodliffe Object lifetime All objects are reference counted (the retain count) NSArray *array1 = [[NSArray alloc] init]; NSArray *array2 = [NSArray array]; [array1 release]; [array2 release]; // wrong Circle *circle = [[Circle alloc] initAtCenterX:100 y:100 radius:200];

iPhone development a brief introduction pete goodliffe Retain Action count [[object alloc] init]; 1 [object retain]; 2 [object release]; 1 [object release]; 0 [object dealloc];

iPhone development a brief introduction pete goodliffe The usual suspects NSObject NSString NSArray NSMutableArray NSNumber NSThread NSDictionary NSMutableDictionary NSApplication NSData NSMutableData NSURL NSSet NSMutableSet NSValue

iPhone development a brief introduction pete goodliffe Statically typed my arse #import

iPhone development a brief introduction pete goodliffe Idioms Delegates Key-value coding Protocol (interfaces) formal and informal

iPhone development a brief introduction pete goodliffe The libraries Objective C Cocoa Touch UIKit, etc Core Audio, Open GL ES, Media Quartz, Core Animation Core Services Core OS Posix,SQLite, Core Foundation, BSD C

iPhone development a brief introduction pete goodliffe in 90 minutes... Demo Intro ‣ Intro The UI ‣ The tools Tips ‣ The language Tools ‣ The UI ‣ Key technologies ‣ Deploying Further info ‣ Further info Language ‣ Tips and tricks Deploying ‣ The demo Technologies UI

iPhone development a brief introduction pete goodliffe Interface Builder

iPhone development a brief introduction pete goodliffe Held in .xib files (Compiled NIBs) Loaded into application (semi-automatically) IB is tightly integrated with Xcode UIKit framework

iPhone development a brief introduction pete goodliffe Create UI elements Link to an object reference in the XIB through properties marked as IBOutlet Link actions to methods defined IBAction

iPhone development a brief introduction pete goodliffe // // ExampleAppDelegate.h // Example // // Created by Pete Goodliffe on 03/04/2010. // Copyright __MyCompanyName__ 2010. All rights reserved. // #import <UIKit/UIKit.h> @interface ExampleAppDelegate : NSObject <UIApplicationDelegate> { UIWindow *window; UINavigationController *navigationController; } @property (nonatomic, retain) IBOutlet UIWindow *window; @property (nonatomic, retain) IBOutlet UINavigationController *navigationController; @end

iPhone development a brief introduction pete goodliffe in 90 minutes... Demo Intro ‣ Intro ‣ The tools Tips ‣ The language Tools ‣ The UI ‣ Key technologies ‣ Deploying Further info ‣ Further info Language ‣ Tips and tricks Deploying ‣ The demo Technologies UI

iPhone development a brief introduction pete goodliffe ‣ Intro Key in 90 minutes... ‣ The tools ‣ The language ‣ The UI Tips Demo Intro Tools technologies ‣ Key technologies ‣ Deploying Further info ‣ Further info Language ‣ Tips and tricks Deploying ‣ The demo UI Technologies

iPhone development a brief introduction pete goodliffe UIKit Core Graphics Core Audio Media Core / AVFoundation MapKit / Core Location CoreData (or sqlite) OpenGL ES External Accessory

iPhone development a brief introduction pete goodliffe in 90 minutes... Demo Intro ‣ Intro Deploying ‣ The tools Tips ‣ The language Tools ‣ The UI ‣ Key technologies ‣ Deploying Further info ‣ Further info Language ‣ Tips and tricks ‣ The demo Deploying UI Technologies

iPhone development a brief introduction pete goodliffe Deploying iPhone simulator iPhone developer account ($$$) free “DRM hell” x86 Deployment certificates runs at desktop speed different build targets 100 devices per year more memory network stable App store iTunes connect Another build type

iPhone development a brief introduction pete goodliffe App store submit get rejected fix it resubmit profit

iPhone development a brief introduction pete goodliffe in 90 minutes... Demo Intro ‣ Intro ‣ The tools Tips ‣ The language Tools ‣ The UI ‣ Key technologies ‣ Deploying Further info ‣ Further info Language ‣ Tips and tricks ‣ The demo Deploying UI Technologies

iPhone development a brief introduction pete goodliffe in 90 minutes... Demo Intro ‣ Intro Further info ‣ The tools Tips ‣ The language Tools ‣ The UI ‣ Key technologies ‣ Deploying Further info ‣ Further info Language ‣ Tips and tricks Deploying ‣ The demo UI Technologies

iPhone development a brief introduction pete goodliffe Xcode documentation developer.apple.com/iphone Books Websites Stack Overflow, CocoaDev, ADC Videos on iTunes U http://itunes.stanford.edu/

iPhone development a brief introduction pete goodliffe in 90 minutes... ‣ Intro ‣ The tools ‣ The language ‣ The UI Tips Tips Demo Intro Tools and tricks ‣ Key technologies ‣ Deploying Further info ‣ Further info Language ‣ Tips and tricks Deploying ‣ The demo UI Technologies

iPhone development a brief introduction pete goodliffe Thinking iPhone

iPhone development a brief introduction pete goodliffe Get the UI right HIG resource conservation (alpha blending, prerendering)

iPhone development a brief introduction pete goodliffe The network is not always available

iPhone development a brief introduction pete goodliffe Do not write to disk (often)

iPhone development a brief introduction pete goodliffe Conserve resources RAM CPU filesystem

iPhone development a brief introduction pete goodliffe in 90 minutes... Demo Intro ‣ Intro The demo ‣ The tools Tips ‣ The language Tools ‣ The UI ‣ Key technologies ‣ Deploying Further info ‣ Further info Language ‣ Tips and tricks Deploying ‣ The demo UI Technologies

iPhone development a brief introduction pete goodliffe (wish me luck) wasn’t that marvellous?!

iPhone development a brief introduction pete goodliffe Pete Goodliffe pete@goodliffe.net

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iPhone development: A brief introduction

by Pete Goodliffe on Apr 26, 2010

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