Introduction to iOS Software Development

Introduction to iOSSoftware Development Adrian Kosmaczewski - akosma software Do 6.1 - OOP 2011 - München

Adrian Kosmaczewski

http://www.ﬂickr.com/photos/gi/164281467/

http://www.ﬂickr.com/photos/jm3/379494322/

http://www.ﬂickr.com/photos/21025851@N00/2168398185/

http://www.ﬂickr.com/photos/emiliagarassino/2146648332/

akosma software

akosma.com github.com/akosmalinkedin.com/in/akosmaformspring.me/akosma twitter.com/akosmaslideshare.com/akosma

http://www.ﬂickr.com/photos/oskay/365607662/

http://www.ﬂickr.com/photos/oskay/365607591/

http://www.ﬂickr.com/photos/blakespot/2379207825/

http://www.ﬂickr.com/photos/justdrew1985/4348527596/

Some questions

Veteran NeXT or Mac OS X developers in the room?

Which Languages,Frameworks, Platforms?

iOS devices in the room?

Program History The App Store Objective-C Design Cocoa Books Tools Q&AWeb vs. Native Apps

History

“Good design survives” Erich Gamma OOP 2011 Keynote

born in the 80s

Objective-C

"Thin layer around C"Message-dispatch runtime built on C obj_msgSend()Static and dynamic (you choose)The “real” inspiration for Java: http://cs.gmu.edu/~sean/stuff/java-objc.html

Single inheritance + interfaces (“@protocols”)@protocols can have @optional methodsFields protected by defaultAll methods are public, virtual and overridableMethods can be added to existing classes ("categories")Full introspection / reﬂectionMessages can be intercepted and forwarded à la AOP

Objective-C Java @interface (.h) & class (1 ﬁle)@implementation (.m) @protocol interface #import // ﬁles! import // classes! categories n/a (C#, “class extensions”) n/a (generics?) id "void*"

Objective-C Java / C# n/a @selector (C# delegates)NSObject / NSProxy / ... Object@public / @protected / public / protected / private @private@try / @catch / @ﬁnally try / catch / ﬁnally NSException Exception n/a package / namespace

Classes

class ex ten ds

Methods

Syntax inspired from Smalltalk

ex) t, ind jec Ob t(an jec r tOb dinsevoi

aNam e.copy()this.alloc().initWith String(aName).auto release()

Memory Management

iPhone 3G: 128 MB RAMiPhone 3GS, iPad: 256 MB RAMiPhone 4: 512 MB RAM

±70 MB for the OS!

no swap ﬁle

(no virtual memory)

http://www.ﬂickr.com/photos/cheek/699407283/

no garbage collection

objects have a“retain count”

http://cocoadevcentral.com/d/learn_objectivec/

basic rule:

for every[alloc], [retain], [copy] there must be a [release]

beware:

Objective-C only allows objects on the heap

http://linguiniontheceiling.blogspot.com/2008/10/thats-madame-trash-heap-to-you.html

No automatic objects on the stack (C++)

http://www.futuregov.net/photologue/photo/2008/aug/30/stack-papers/

// C++// Memory freed when out of scopestd::string name(“Adrian”);std::string *name = NULL;name = new std::string(“Adrian”);delete name;

iOS memory warnings

http://www.ﬂickr.com/photos/tbuser/2763035540/

http://akosma.com/2009/01/28/10-iphone-memory-management-tips/

http://akosma.com/2009/07/16/objective-c-compiler-warnings/

XcodeInterface Builder

Instruments

Clang Static Analyzer

http://llvm.org/

http://clang-analyzer.llvm.org/

Source: Apple Documentation

Demo 1“Hello, World!”

Web or native apps?

business formsupdate frequency web apps reports native apps stocks calculator usage frequency UI complexity

Web Application Native SDK Application Faster execution; Simpler deployment and access to address book, updates; accelerometer, audio and known technologies,Pros camera; cheaper to maintain; 3D games and animations; access to GPS information; push notiﬁcations; basic ofﬂine support. Bonjour networking support. Slower to execute; App Store review process;Cons no access to hardware. longer update times.

Sencha Touch CappuccinoiUI LiquidGearjQTouch PhoneGapWebApp.net SaﬁreXUI jPintRhodes Magic FrameworkSproutCore

Also remember

Not all WebKitsare made equal

WebKit Compatibility Table http://www.quirksmode.org/webkit.html

Native appsadvantages

1ofﬂine tc hin gu p! b ca we

2location services tc hin gu p! b ca we

3camera

4audio & 3D

5accelerometer & p! gyroscope b ca tc hin gu we

6notiﬁcations

http://www.ﬂickr.com/photos/epitti/2565572445/

7monetization!

Native components

Address Book http://www.ﬂickr.com/photos/kevinmarsh/2315151843/ABAddressBookABMultiValueABMutableMultiValueABRecordABGroupABPerson

Accelerometer http://www.ﬂickr.com/photos/evert-jan/2785380754/ http://www.ﬂickr.com/photos/evert-jan/2784525711/UIAccelerometer UIAccelerometerDelegate

VideoMPMoviePlayerController http://www.ﬂickr.com/photos/pingping/1431127181/

CLLocation CLLocationManager Location serviceshttp://www.ﬂickr.com/photos/thomcochrane/2780365916/

Graphics & Animation http://www.ﬂickr.com/photos/alleus/2905293514/CALayerCAAnimationUIGraphicsContextCGRect / CGMakeRectUIBezierPathUIColor

Camera & Photo Library http://www.ﬂickr.com/photos/ernohannink/2713579416/UIImagePickerControllerUIImagePickerControllerDelegateUIImagePickerControllerSourceTypeCameraUIImagePickerControllerSourceTypePhotoLibrary

And MoreAudio AirPrintXML iCal (EventKit)WebKit AirPlaySQLite / Core Data CompassNetworking GyroscopeBonjour GesturesBluetooth / GameKit Core Text

Other languages? Cross-platform?

http://akosma.com/2009/10/29/iphone-apps-without-objective-c/

The App Store in 5 steps

1. Register

http://developer.apple.com/programs/iphone/

2. Develop

3. Publish

RequirementsFree apps: nothingPaying apps: EIN Number, via IRS Bank account

4. Approval

4.1 Rejection

“Your application cannot be posted to the App Store atthis time because it does not adhere to the iPhoneHuman Interface Guidelines as outlined in iPhone SDKAgreement section x.x.x.When the device is in this or that condition, theapplication does not do this or that. This behaviormight lead to user confusion. It would be appropriateto display either a notiﬁcation or an alert stating thatsuch or such condition is required.In order for your application to be reconsidered for theApp Store, please resolve this issue and upload yournew binary to iTunes Connect.”

5. Sales

https://itunesconnect.apple.com/

Market?

160M iOS Devices

16M iPads (2010)

10B App Downloads

Demo 2:Flashlight

Honor the Mobile Human Interface Guidelines

http://developer.apple.com/iphone/library/documentation/ userexperience/conceptual/mobilehig/

avoid this

http://www.ﬂickr.com/photos/gruber/2635257578/

and this

http://smokingapples.com/iphone/app-store-iphone/the-worst-twitter-client-ever/

“I canʼt find one redeeming quality about this app. It’s slow to start [on a3GS], doesn’t respond to taps while it’s trying to load other things, andcrashes if you try to change modes a lot. It’s limited to only timeline,replies, and messages. It has no other functionality. Oh wait… I forgot itskiller feature, you can have custom backgrounds and choose the color ofyour tweets. That totally makes up for its lack of useful features andsluggish performance. I’m not sure why someone would bother buildingsuch an inferior app other than that they wanted to find some suckers andscore a quick buck. It seems even more insane to me that they’d beactively seeking out reviewers to cover this. I was given a promo code forChillTwit, and even for free I didnʼt want it on my phone. I was sad justfrom looking at screenshots. Actually seeing it running confirmed all of myfears. If it was a free app, I might forgive the developer, but the fact thatheʼs trying to get $0.99 out of people pisses me off to no end. Go buyTweetie.If you somehow weren’t scared away by all my bitching and whinning, youcan see ChillTwit on the app store here. But seriously, if you buy this,weʼre not friends anymore.

Thanks!

Questions?

Introduction to iOS Software Development

by Adrian Kosmaczewski on Jan 29, 2011

Accessibility

Categories

Tags

Upload Details

Usage Rights

4 Embeds 132

Statistics

Introduction to iOS Software Development — Presentation Transcript

http://akosma.com	84
http://blog.amt.in	39
http://www.slideshare.net	8
http://twitter.com	1