This talk was given at ISELTech 2013. The objective was to convince people to embrace iOS Development.

1. iOS Development:
Everything you need to know
Fábio Bernardo
iOS Developer @ SAPO

2. Who am I?
• iOS Developer
• SAPO
• @fbbernardo on Twitter
• iPhoneModem, It’s Playing, SAPO Desporto...

3. Who am I?
• iOS Developer
• SAPO
• @fbbernardo on Twitter
• iPhoneModem, It’s Playing, SAPO Desporto...

4. Who am I?
• iOS Developer
• SAPO
• @fbbernardo on Twitter
• iPhoneModem, It’s Playing, SAPO Desporto...

5. Who am I?
• iOS Developer
• SAPO
• @fbbernardo on Twitter
• iPhoneModem, It’s Playing, SAPO Desporto...

6. Why am I here?
Talk overview
• A little bit of history
• What you need to know about the  App Store
• The first steps of iOS Development
• Cocoa Touch
• What are my expectations for The Future™
• Q&A

7. The first iPhone
June, 2007
• No App Store
• Do web apps!
▪ Adventurous developers start using something called the “toolchain”
• The jailbreak community is born
• Installous and Cydia

8. The iPhone OS SDK
July, 2008
• Developers everywhere rejoice
• Cocoa Touch and Objective-C
• Protected by NDA until October, 2008
• 70% – 30% revenue model
• Introduced the Review Process
• No video or audio recording, no notifications, no copy paste, no share, no core data, no maps...
• Later renamed to iOS SDK

9. Rags to riches
Some examples

10. Rags to riches
Some examples
Trism

11. Rags to riches
Some examples
Trism
$250k in two months

12. Rags to riches
Some examples
iSteam

13. Rags to riches
Some examples
$100k in two weeks
iSteam

14. Rags to riches
Some examples
Tap Tap Revenge

15. Rags to riches
Some examples
1,000,000 downloads in two
weeks
Tap Tap Revenge

16. Rags to riches
Some examples
Flipboard

17. Rags to riches
Some examples
52M users and only two
apps
Flipboard

18. iOS App Store
Downloads and number of apps
0
200
400
600
800
2008 2009 2010 2011 2012 2013
0
11,250
22,500
33,750
45,000
10 1,500
5,000
15,000
25,000
45,000
0.8
65
250
425
550
800
Apps Available (Thousands) Downloads (Millions)

19. iOS App Store
Interesting data
• The top category by revenue ($) is Games
• “iOS App Store generated 2.6x the app revenue of Google Play in Q1 2013”
• Education is the fourth largest category in revenue ($)
• Flipboard has 56M users and only two apps
• Instagram has 100M users and only two apps
• $10,000 prize for the App Store’s 50 billionth download

20. What you will need
To become an iOS Developer
• OS X
• Objective-C
• Cocoa Touch
• An iPad/iPhone/iPod Touch for testing (unless you’re doing a fart app)
• Register on Dev Center
• $99 per year

21. Popular alternatives
To OS X or Objective-C
• RubyMotion — $199.99 (OS X)
• Xamarin.iOS – formely MonoTouch — Free to $1899 (OS X & Windows)
• Titanium — Free (OS X)
• Adobe AIR — $249.00 (OS X & Windows)
• Unity — $400 Free (OS X & Windows)

22. Objective-C
Introduction
• Unusual syntax
• C based
• Weak and dynamic typing
• ARC
• Categories
• Swizzling

23. Objective-C
The usual rants
• Syntax
• Crash logs & exceptions
• Header files
• Memory management
• No packages

24. Objective-C
An example – brackets
object.performAction();
Object Method name
[object performAction];[object performAction];

25. Objective-C
An example – brackets
object.performAction();
Object Method name
[object performAction];[object performAction];

26. Objective-C
An example – arguments
object.performAction(arg1);
Object Method name
[object performAction:arg1];
A parameter

27. Objective-C
An example – arguments & message names
object.performAction(arg1, arg2);
Object Method name
[object performAction:arg1 withArg:arg2];
1st parameter 2nd parameter

28. - (void)viewDidLoad {
[super viewDidLoad];
UIButton *button = [UIButton buttonWithType:UIButtonTypeRoundedRect];
[button setTitle:@"Title" forState:UIControlStateNormal];
[button sizeToFit];
[self.view addSubview:button];
}
Objective-C
An example

29. - (void)viewDidLoad {
[super viewDidLoad];
UIButton *button = [UIButton buttonWithType:UIButtonTypeRoundedRect];
[button setTitle:@"Title" forState:UIControlStateNormal];
[button sizeToFit];
[self.view addSubview:button];
}
Objective-C
An example

30. - (void)viewDidLoad {
[super viewDidLoad];
UIButton *button = [UIButton buttonWithType:UIButtonTypeRoundedRect];
[button setTitle:@"Title" forState:UIControlStateNormal];
[button sizeToFit];
[self.view addSubview:button];
}
Objective-C
An example

31. - (void)viewDidLoad {
[super viewDidLoad];
UIButton *button = [UIButton buttonWithType:UIButtonTypeRoundedRect];
[button setTitle:@"Title" forState:UIControlStateNormal];
[button sizeToFit];
[self.view addSubview:button];
}
Objective-C
An example

32. - (void)viewDidLoad {
[super viewDidLoad];
UIButton *button = [UIButton buttonWithType:UIButtonTypeRoundedRect];
[button setTitle:@"Title" forState:UIControlStateNormal];
[button sizeToFit];
[self.view addSubview:button];
}
Objective-C
An example

33. - (void)viewDidLoad {
[super viewDidLoad];
UIButton *button = [UIButton buttonWithType:UIButtonTypeRoundedRect];
[button setTitle:@"Title" forState:UIControlStateNormal];
[button sizeToFit];
[self.view addSubview:button];
}
Objective-C
An example

34. - (void)viewDidLoad {
[super viewDidLoad];
UIButton *button = [UIButton buttonWithType:UIButtonTypeRoundedRect];
[button setTitle:@"Title" forState:UIControlStateNormal];
[button sizeToFit];
[self.view addSubview:button];
}
Objective-C
An example

35. Cocoa Touch
What it is
• An umbrella term for a lot of API’s
• Follows MVC
• Lot’s of delegates, datasources, observers, notifications...
• UIKit – buttons, sliders, navigation bars, toolbars, spinning wheels, bar buttons, storyboards...
• GameKit, PassKit, CoreAnimation, Accounts, etc...

36. UIKit
Storyboards

37. Demo

38. iOS Development
Some notes
• An iPhone & iPad application is an universal binary
• 99% is reusable between iPhone and iPad
• Easily ported to OSX
• Game Center is your friend if you’re planning to make a game

39. Learn more
The best resources out there
• Stanford’s iPhone Application Development
• Big Nerd Ranch’s iOS Programming
• WWDC Sessions

40. Bingo!
There’s this thing called WWDC Bingo...
Retina
Display
Macbook Air
iOS 7.0
Redesigned
Passbooks
via
Bluetooth
LE
Interactive
Push
Notifications
Retina iPad
Mini
Remote
View
Controllers
One More
Thing™
“Deliver
Once”
Notifications
“magical” Siri API
iCloud done
right
Apple TV
SDK
Siri for OSX
Maps for
OSX
iCloud
Sharing
?

41. Q&A