lecture (november 18th): basics of ios development
DESCRIPTION
These are the slides for the lecture I gave on November 18th for the Polytechnic of Milan's Human-Computer Interaction course. It gives pointers to people that want to begin developing for iOS.TRANSCRIPT
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iPHONE + iPAD:SUDDENLYSOMETHING ELSE∞ · NOVEMBER 18th 2010 · HCI · POLIMI
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THE FUTUREOH MY GOD THE FUTURE
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PROGETTO
DATA STATO1987-2001 SCIENCE FICTION
TRICORDER + D-PADSTAR TREK TNG · DS9 · VOYAGER
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FUTUREOH MY GOD THE FUTURE AND IT IS HERE
PRESENT
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1. It’s full of stars(THE FUTURE IS HERE THE FUTURE IS HERE)
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2. It’s where users are!
“THE IPHONE HAS BEEN ABLE TO MAINTAIN OVER 100% Y/Y GROWTH ON AVERAGE.”WWW.ASYMCO.COM
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… (maybe because it’s the most usable?)
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3. €€€€€€€€€€€€€€€€€€€(case study: me.)
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APPLE IPHONE 3G AD: “SHARE”.HTTP://WWW.YOUTUBE.COM/WATCH?V=0CIPNTUVX0C
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> 2,2 million free d/l> 95,000 paid downloads
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È STATO UN POMERIGGIO DI FINE ESTATESTAVO CAMMINANDO PER LE VIE DEL CENTRO MILANESE (IN CUI PIACE MOLTO PERDERMI) ED ERO IN ZONA BRERA QUANDO SENTO SQUILLARE IL MIO CELLULARESECCATO LO TIRO FUORI, MA UNO SGUARDO ALLO SCHERMO ACCENDE LA MIA CURIOSITÀ. “+44” DICE LO SCHERMO (NON RICORDAVO AL MOMENTO MA QUELLO ERA IL PREFISSO INTERNAZIONALE DEL REGNO UNITO).ALL’ALTRO CAPO UNA VOCE ITALIANA MI FA “CIAO, SONO NONPOSSODIRLO DI APPLE, CHIAMO DA LONDRA.VORRESTI METTERE LA TUA APP NEL NOSTRO SPOT?”
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YOU, MAKING APPS.(Let’s talk about it.)
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Design.
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The iPhoneIS A BUNCH OF SENSORS IN YOUR POCKET WITH A SCREEN.
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PLAYING MAKE-BELIEVEEXCEPT IT WORKS FOR REAL
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IBOOKS BY APPLE.
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OCARINA BY SMULE.HTTP://WWW.YOUTUBE.COM/WATCH?V=RHCJQ7EAJJA
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The iPhoneIS DIFFERENT FROM A DESKTOP COMPUTER BLUH BLUH BLUH
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Desktop differences
Quick use. (Pick it up, use it, back in the pocket.)
Imprecise input, bad (best-of-breed) keyboard.
Made for touching: direct manipulation.
Point to pick!
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The iPhoneIS DIFFERENT FROM ITS COMPETITORS
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Differences with other phones/OSes (I)
All OS tries to rate good-if-not-best.
Most needed stuff built in.
(Many other factors, but few directly affecting us.)
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Differences with other phones/OSes (II)
One thing at a time: discrete apps.
Consistency broken very carefully.
RELIABLE!
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iOS≈ Mac OS X (but different)
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iOS
No filesystem
Instead, discrete tasks in apps!
Built atop responsiveness
Animation everywhere.
No virtual memory (writing)
Apps must not make the OS go out of memory!
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Apps
Isolated!
Can communicate (URLs, open files, pasteboard [copy/paste])
User always in control.
If user presses Home, YOU QUIT.
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Tools.NOT CHEAP!
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REQUIRED STUFF »
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PLATFORM
DATE STATUSNOVEMBER 15 NEW MACS EVERY 3-6 MONTHS
A MAC€999+
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TOOLS
DATE STATUSNOVEMBER 15 IN FLUX
XCODEXCODE TOOLS + IOS SDK 4
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http://developer.apple.com/iosTOOLS ARE FREE · INCLUDES SIMULATOR
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OPTIONAL STUFF (at least at the time you start) »
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TESTDEVICE
DATE STATUSNOVEMBER 15 EXPENSIVE
IPHONE€539+ (ACTUALLY OPTIONAL)
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TESTDEVICE
DATE STATUSNOVEMBER 15 MUCH CHEAPER!
IPOD TOUCH€239+ (ACTUALLY OPTIONAL · WI-FI ONLY)
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http://developer.apple.com/iosDEVICE DEBUG + DEPLOY: € 79/year
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And now ACTUAL DEVELOPMENT STUFF.
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Objective-C.C + OBJECTS.
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float f = 1.23;int x = fabs(f);
PURE C.
float f = 1.23;int x = fabs(f);
OBJECTIVE-C.
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[calculator add:1 to:2 and:3];// method == “-add:to:and:”// arguments == 1,2,3
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-(void) add:(int)a to:(int)b and:(int)c;
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NSString* x = …;NSString* y = [x substringToIndex:10];
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id x = …;id y = [x substringToIndex:10];
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NSArray* a = …;[a addObject:@“12345”];
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NSArray* a = …;[a performSelector:@selector
(addObject:) withObject:@“1234”];
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VIEW CONTROLLERS
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VIEWSmake up what’s onscreen
VIEW CONTROLLERSmake up the LOGICAL structure of your app.
NAVIGATION
ALL SONGS » FAVORITES »
EDIT » SONG PICKER
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UIAPPLICATION
the app’s DELEGATE
WINDOW
views for 1
VIEW CTL 1 VIEW CTL 2
views for 2
owns
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UIAPPLICATION
the app’s DELEGATE
WINDOW
views for 1
VIEW CTL 1 VIEW CTL 2
views for 2
BRING YOUR OWN
DONE!
DONE!
DONE!
BRING YOUR OWN
BRING YOUR OWN
DONE!COMBINE ‘EM
ALL!COMBINE ‘EM
ALL!
owns
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A SIMPLE APP · TOOLS DEMO.
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Memory management(IMPORTANT BUT BRIEF)
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Memory management
No automatic garbage collection! (unlike Java, C#)
Reference counting!
If you do it wrong your app will leak or
crash or
both!!!
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CREATED!1
-retain;2!
-release;1!
-release;0!
DEALLOCATED!-
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NSArray* a = [[NSArray alloc] init]; // you own it[a retain]; // you own it x2[a release]; // you own it[a release]; // gone!
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NSArray* a = [NSArray array]; // what do I have to do here?!?
// the answer: NOTHING! no release, no retain,
// unless you need it PAST this function’s return.
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CREATED!1
-autorelease;1
AUTORELEASE POOL
LATER!(release)0!
DEALLOCATED!
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THE RULES (1):
every use of:•alloc/init•retain•copy…•new…
must be balanced by a call to either of:•release•autorelease
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THE RULES (2):
if you want to keep an object you don’t own past the end of the current function, you need to call -retain on it (and -release or -autorelease when done with it).
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Goodies you get on iOS + App Store.
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BONJOURNETWORK AUTODISCOVERY
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GAME CENTERBLUETOOTH + WIFI + ’NET · LEADERBOARDS · ACHIEVEMENTS · INVITES · MATCHMAKING · VOIP
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IADINTEGRATED ADVERTISING PLATFORM · NO EXTRA BUREAUCRACY
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IN-APP PURCHASEPAYMENT PROCESSING FOR IN-APP FEATURES & CONTENT · NO EXTRA BUREAUCRACY
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COUNTRIES SUPPORTED BY APP STOREWOW.
90!venerdì 19 novembre 2010
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LOCALIZATION + TOP-TIER UNICODE SUPPORTBUILT-IN TO THE CORE OF THE PLATFORM.
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GOOGLE MAPS & GEOLOCALIZATIONNO NEED TO PAY GOOGLE’S APPLICATION €€€
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AUDIO AND VIDEO PLAYBACK + ENCODINGON A MOBILE DEVICE! · H.264 + AAC + MP3 + UNCOMPRESSED FORMATS
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CORE DATAOBJECT DATABASE · TONS OF FEATURES · OPTIMIZED FOR MOBILE · > 1MLN OBJECT STORES
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CORE ANIMATIONUNDERLIES EVERYTHING ONSCREEN · TWEENING · 3D · HIGH-PERFORMANCE · MADE FOR UIS
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SECURITYONBOARD AES ACCELERATION · ENCRYPTED STORAGE · API FOR APP USE · REMOTE MANAGEMENT
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App Store
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WHAT IT IS:
• The only way you can get apps on your iPhone (except development)
• Hosting
• Payment processing
• Sales!
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TO PUBLISHYOU NEED:
• Mac + dev tools + test devices
• Developer program account (79€/year)
• Lots of patience
• VAT # + good accountant (Italy)
• A business plan!
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YOU CAN PUBLISH: • Most stuff.
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YOU CAN’T PUBLISH:
• Porn
• Stuff that misleads
• Stuff that uses Apple trademarks unfairly
• Stuff that breaks privacy laws
• Stuff whose behavior changes after review
• Interpreters (!) (*)
• Betas & Demos
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BORDERLINE:
• Satire
• Crashers
• “Lite”
• Big downloaders
• More apply depending on APIs
https://developer.apple.com/appstore/resources/approval/guidelines.html
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YOU SET THE PRICE:
• $0.99 to $999.99 (and international equivalents)
• Most apps in the $0.99-$4.99 range
• You get 70%
• Apple gets 30% (and VAT/taxes if applicable)
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IT’S A GAMBLE.
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iPAD!
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TESTDEVICE
DATE PURPOSENOVEMBER 17TH VARIES
IPADTHE NEW HOTNESS
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The iPad is another kind of animal altogether.
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iPhone
Take it out, use it, back in the pocket.
Small screen means one thing at a time
Mostly used for its connectivity
iPad
Take it out, use it for a longer period of time.
Larger screen means more stuff/more details.
Mostly used for media consumption and productivity
MORE THAN A PHONENOT ENTIRELY
UNLIKE A LAPTOP
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Laptop
Traditional mouse/keyboard paradigm.
Chrome around your media
Usually portable
Good text entry
iPad
Multitouch, like on iPhone (and better!)
Just the media
Highly portable
Decent text entry
OLD AND BUSTEDA DIFFERENT THING,
CLEARLY
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The iPad is the iPhone, all grown up to be an actual computer.
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There’s more space.USE IT.
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→
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→
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HTTP://WWW.APPLE.COM/IPAD/GUIDED-TOURS/#IBOOKS
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HTTP://WWW.APPLE.COM/IPAD/GUIDED-TOURS/#PAGES
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HTTP://WWW.YOUTUBE.COM/WATCH?V=GEW68QJ5KXW
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We don’t know what the iPad is…
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… because it’s a new kind of computer.
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PLAYING MAKE-BELIEVEEXCEPT IT WORKS FOR REAL
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THE FUTUREOH MY GOD THE FUTURE
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YEAH WE’RE DONE! Questions?
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