Objective C

Intro

1. History
2. Language Comparison
3. Language Comparison (2)
4. Types / Typing
5. Classes (intro)
6. Messages
7. Selectors


8. Classes
1. Inheritance
2. Protocols
3. Categories
9. Forwarding
10. NSObject
11. Code Conventions

References

Objective C - NSObject

NSObject is the rich class which serves as the base for most of the GNUStep/NextSTEP/Cocoa foundation classes. It offers a number of methods that are very important for Cocoa/NextSTEP/GNUStep programmers to be aware of.

• Root class for most foundation classes
• Allocation/Initialization
  • +alloc (rarely overridden)
  • +allocWithZone (rarely overridden)
  • -init (typically overridden by subclasses)
  • +new (convenience method that calls [[self alloc] init])
  • (and more)
• Memory managment
  • -retain
  • -release
  • -autorelease
• Inheritance/etc. testing
  • +conformsToProtocol:
  • +isSubclassOfClass:
  • (and many more)