Absolute Beginners Guide to iPhone dev

Absolute Beginners Guide to iPhone dev - Presentation Transcript

Absolute beginners guide to... iPhone Development Barry Ezell

Technology Unconference USF College of Business September 26th - Dev Day September 27th - Media Day http://barcamptampabay.com

• Intro to the Intro • What you need: Hardware • What you need: Software • What you need: Wetware • Code! • Submit

All about me • Ruby, C#, Erlang • iPhone beginning 3/2009 • One app in store (SuccessIts) • One submitted (Bookmark, bookmarkapp.com) • Several in works

You don’t have to be a fanboy • Accelerometer, camera, video, magnetometer, iPod, touch, OpenGL • Over 37M units sold (4/2009) • Over 1.5B app downloads • $2.4B a year in sales

Pros • Controlled, predictable platform • 320x480 px • Good documentation • Apple handles sales

Cons • All Apple all the time • Their hardware • They approve / reject apps • No alternative app store • You can use any language as long as it’s Objective-C

WYN: Hardware • Intel-based Mac running Leopard or S.L. • iPhone / iPod Touch

WYN: Software

XCode et al. • XCode 3.x and Instruments on install disk under “Optional Installs” • Download iPhone SDK, simulator from Apple (after joining dev program) • All free

Registered iPhone Developer Program http://developer.apple.com/iphone/ Free Test using the simulator, no sales Test on devices, unlimited sales in Standard ($99/yr) App Store Unlimited in-house distribution, no Enterprise ($299/yr) App Store sales

WYN: Wetware • Learn Objective-C • Learn Cocoa Touch, Frameworks

Objective-C Square brackets represent!

• OO, strict superset of C, inspired by Smalltalk messaging • Any valid C or C++ code works • You handle memory management • [object retain]; • [object release];

Messaging • Objects are passed messages with descriptive arguments coyote.hunt(roadRunner,rocketSkates,true);

Resources • Apple’s Object-Oriented Programming with Objective-C http://bit.ly/13QlgA • Peepcode screencast series: Objective-C for Rubyists • Programming in Objective-C 2.0 by Stephen G. Kochan

Cocoa Touch • Desktop Cocoa adapted for the iPhone • Frameworks: • UIKit (touch, windowing, accelerometer) • CoreGraphics (Quartz, PDF, animation) • CoreLocation (GPS) • MediaPlayer (iPod) • Many more

Resources • Pragmatic Programmer: iPhone SDK Development by Bill Dudney • iPhone Developer’s Cookbook by Erica Sadun • Interwebs: iphonedevsdk.com, Apple forums, Google

Let’s Code • Finally! • TweetCount • XCode > New Project > Utility Application

One Window, many Views UITableView

One Window, many Views UIButton UIImageView UIProgressView UILabel

.nib or .xib ﬁles • Normally both called “nibs” • “Freeze-dried” objects, interface elements, and relationsips • Normally single .xib launched at app start

IBOutlet & IBAction • IBOutlets allow getting and setting properties on objects in IB • IBActions allow objects to receive events like touches or value changes

Test on Devices • Simulator != iPhone • Get Provisioning Proﬁles and Development Certiﬁcates on iPhone Dev Portal • Make life easier with wildcard naming: com.barryezell.*

Device Testing • Conﬁgure app for device testing • Change Active SDK to “Device” • Set Signing Identity under Project > Edit Project Settings • Set your App ID in info.plist ﬁle

Submit to Apple • Set Release conﬁguration • Set App Store Signing Identity • Add artwork (57x57, 512x512 icons) • Compile and zip with 57x57 icon

Upload to iTunes Connect

Tips while waiting on Apple • Avoid cracks in sidewalk • Ditto walking under ladders • Try to forget you ever invested all that time

Resource of Resources • http://theappleblog.com/2009/06/01/43- iphone-development-resources