Talk at PhD Computer Science students’ Journal Club in Cardiff University (FTS - Food, Talks and Stuff).

1. FTS seminar
27.01.2010
iPhone Programming
in ~30 mins (?)
Diego Pizzocaro

2. Disclaimer
These slides are heavily based on Evan Doll and Alan Cannistraro’s
slides prepared for iPhone App Programming course @ Stanford
http://www.stanford.edu/class/cs193p
Look for iPhone Application Programming
in iTunes U for videopodcasts.

3. Crash course
• iPhone OS overview
• Objective-C
• Model-View-Controller (MVC)

4. iPhone OS overview

5. iPhone

6. Mac OS X
Cocoa
Media
Core Services
Core OS

7. iPhone
Cocoa Touch UI application framework
which as a developer you
Media are using the most
Core Services
Core OS

8. Developing on iPhone
Tools
Tools
Tools
Xcode Interface Builder
Xcode
Xcode Interface Builder
Interface Builder
Tools
Xcode Interface Builder
Cocoa Touch
Frameworks
Frameworks
Frameworks
Frameworks
Foundation
Foundation UIKit
UIKit
Foundation
Foundation UIKit UIKit
Language
Language
Language [textView setStringValue: @“Hello”];
[textView setStringValue: @“Hello”];
[textView setStringValue: @“Hello”];
(& Runtime)
(& Runtime)
(& Runtime)
Language [textView setStringValue: @“Hello”];
Objective-C
Objective-C
Objective-C
(& Runtime) Objective-C

9. Objective-C

10. Objective-C
• Strict superset of C
‣ Mix C with Obj-C
• Object oriented language
• Based on message passing (similar to Smalltalk)
• No garbage collector need to manually manage memory
(not covered in this presentation)

11. Message Syntax
[receiver message];
[receiver message:argument];
[receiver message:arg1 andArg:arg2];

12. Message Examples
BankAccount *myAccount; //assume this exists
int n = [myAccount accountNumber];
[myAccount deposit:100];
if([myAccount isNotEmpty]) {
[myAccount withdraw:50 printReceipt:YES];
}

13. Some new types
• Anonymous Objects
• Class
• ...others but no time!
(Selectors “SEL”, Boolean “BOOL”, etc.)

14. Anonymous Objects
• Normal (or Statically-typed) object
BankAccount *anAccount
• Anonymous (or Dynamically-typed) object
id anAccount
- Just id (Not id*)
- id is the data type that indicates that we are talking about an object

15. Class
• class instances responds to instance methods “-”
- (id)init;
- (double)accountNumber;
int n = [myAccount accountNumber];
• classes responds to class methods “+” (like Java “static” methods)
+ (id)alloc;
+ (float)stdInterestRate;
float rate = [BankAccount stdInterestRate];

16. Defining aaclass
Defining a class
Defining class
A public header and a private implementation
A public header and a private implementation
A public header and a private implementation
Header File File
Header
Header File Implementation File
Implementation File File
Implementation

17. Defining a class
Defining a class
Demo
A public header and a private implementation
A public header and a private implementation
BankAccount class
BankAccount.h
Header File File
Header BankAccount.m
Implementation File File
Implementation

18. Model - View - Controller (MVC)

19. Address Book

20. App Architecture
Model View
Controller

21. MVC
• Only the Controller knows both Model and View
• Makes code more reusable (especially the Model part)
Interface Builder
Model View
Controller
Xcode

22. Demo
BankAccount app
View
Model ✓ MainWindow.xib
BankAccount
BankAccount
BankAccount
balance
balance
balance Value Changed
- initWithBalance EVENT
- -initWithBalance
-initWithBalance
setBalance
-setBalance
setBalance
- - balance
--balance
balance
Controller
AccountController
slider
Outlets
label
myBankAccount
Action - updateAccount

23. Demo
BankAccount app
View
Model ✓ MainWindow.xib
BankAccount
BankAccount
BankAccount
balance
balance
balance Value Changed
- initWithBalance EVENT
- -initWithBalance
-initWithBalance
setBalance
-setBalance
setBalance
- - balance
--balance
balance
Controller
AccountController
slider
label
myBankAccount
- updateAccount

24. Your turn! ;)
• http://www.stanford.edu/class/cs193p
• http://cs193p.com/
• iTunes U - “iPhone Application Programming”
• iPhone Developer Program
(FREE, but cannot deploy on real iPhone)
• users.cs.cf.ac.uk/D.Pizzocaro
Image from: http://www.trumpetvine.com/sketchblog/wp-content/images/2007.07/iphone_lg.jpg