Cocoa with ObjectiveC

1
Cocoa with Objective-C

• Peter Kendall
• COSC 4153-1
• Spring 2008
• Assignment 11

2
Overview

• Brief History
• Methodologies
• Syntax and Grammar
• Example Source Code
• Use of the Language in Industry
• What is not Cocoa?
• Advantages and Disadvantages
• Likes and Dislikes
• Example - Man Viewer
• Conclusion

3
Brief History

• Designed by Brad J. Cox.
• NeXT Software licensed ObjC in 1988 and
  incorporated into NeXTSTEP.
• Open sourced in 1994.
• Apple Computer acquires NeXT on December 20,
  1996, and bases their new OS and application
  development on NeXTSTEP.

4
Methodologies

• Based on SmallTalk-80.
• Layered on top of C.
• Foundation and Application Kit frameworks.
• Objects are put onto the heap.
• Manual memory management.
• Reference counting.

5
Methodologies

• Dynamic typing and binding and everything in
  between.
• All objects are of type id.
• isa method.
• Messages (methods) and the objects are united at
  runtime.
• Load and linking.
• Very nice for debugging.

6
Objective-C 2.0

• Garbage Collection.
• Properties
• Automatic setters and getters.
• Dot notation.
• Fast Enumeration.

7
Syntax and Grammar

• Types
• id - An object (a pointer to its data structure).
• Class - A class object (a pointer to the class
  data structure).
• SEL - A selector, a compiler-assigned code that
  identifies a method name.
• IMP - A pointer to a method implementation that
  returns an id.
• BOOL - A Boolean value, either YES or NO.

8
Syntax and Grammar

• instance-method-definition
• method-type method-selector
  declaration-list compound-statement
• category-interface
• _at_interface class-name ( category-name )
• protocol-reference-list
• interface-declaration-list
• _at_end
• category-implementation
• _at_implementation class-name ( category-name )
• implementation-definition-list
• _at_end

9
Example Source Code
Demo...
10
Use of the Language in Industry
11
What is not Cocoa?
12
Advantages and Disadvantages

• Advantages
• Dynamic
• Develop professional applications in less time.
• Disadvantages
• Dynamic
• Easier to do some wacky things.

13
Likes and Dislikes

• Likes
• Relatively easy to develop elegant applications.
• Dislikes
• Crazy amounts of brackets.

14
Example - Man Viewer
Demo...
15
Conclusion

• Name of the game Dynamic.
• Most Mac OS X applications are being made with
  Cocoa with Objective-C.
• Fully plan to create more applications.
• Continue to make improved versions of Man Viewer,
  and UT3 Mod Installer.
• Many more ideas in the brain.
• iPhone and iPod Touch.

16
Bibliography

• Kochan, Stephen. Programming in Objective-C.
• Hillegass, Aaron. Cocoa Programming for Mac OS
  X.
• Cocoa Fundamentals Guide. http//developer.apple.
  com/documentation/Cocoa/Conceptual/CocoaFundamenta
  ls/index.html
• The Objective-C 2.0 Programming Language.
  http//developer.apple.com/documentation/Cocoa/Con
  ceptual/ObjectiveC/ObjC.pdf