Objective-C Introduction part1

An extended -barely- version of the Objective-C introduction at CocoaHeadsGDL.

Transcript

1. Objective-C intro viernes 23 de marzo de 12
2. History • Born in the 80’s by Brad Cox and Tom Love • A C’s pre-processor • C + Smalltalk = Obj-C • Not really popular viernes 23 de marzo de 12
3. NeXT! viernes 23 de marzo de 12
4. • NeXT was a failure on hardware, but success on building tools • GNU cloned the compiler in the 90s • Apple buys NeXT, relies Objective-C and NeXT tools viernes 23 de marzo de 12
5. Objective-C • Bunch of C extensions • You can write plain C without problems • Interfaces (.h) and implementations (.m) viernes 23 de marzo de 12
6. Objective-C • Dynamic typing (id) viernes 23 de marzo de 12
7. Method syntax viernes 23 de marzo de 12
8. In Objective-C style: viernes 23 de marzo de 12
9. multiparameters viernes 23 de marzo de 12
10. Accessors the properties way the manual way viernes 23 de marzo de 12
11. Properties instead of this.. viernes 23 de marzo de 12
12. Properties .. this setters/getters are created for you viernes 23 de marzo de 12
13. Properties set synthesize on the implementation avoids clutter viernes 23 de marzo de 12
14. Properties • nonatomic • atomic • retain • copy • assign viernes 23 de marzo de 12
15. Memory management • It’s all up to you * viernes 23 de marzo de 12
16. Memory management reference counting viernes 23 de marzo de 12
17. Creating objects or autorelease Everytime you use init or retain, it’s your responsability to release viernes 23 de marzo de 12
18. Memory management viernes 23 de marzo de 12
19. Interface 1 2 3 viernes 23 de marzo de 12
20. Implementation setters viernes 23 de marzo de 12
21. Implementation setters viernes 23 de marzo de 12
22. Implementation viernes 23 de marzo de 12
23. 3 ways to handle memory • Manual reference counting • Garbage collector* (only on Mac) • ARC viernes 23 de marzo de 12
24. ARC viernes 23 de marzo de 12
25. ARC • Memory Management? that’s so 2011 • Automatic Reference Counting • Xcode 4.2+ • Compatible with iOS 4.x* and iOS 5.x viernes 23 de marzo de 12
26. Properties + ARC • atomic • nonatomic • weak • strong viernes 23 de marzo de 12
27. Debug with NSLog same rules as printf() viernes 23 de marzo de 12
28. nil every message sent to nil will be ignored, the app won’t crash viernes 23 de marzo de 12
29. Categories add methods to an existing class without subclassing viernes 23 de marzo de 12
30. Categories Once imported, the category can be used on any NSString viernes 23 de marzo de 12
31. Protocols • Declare methods that others are expected to implement viernes 23 de marzo de 12
32. Delegate Pattern • Handing a task to another part of the program. • i.e. a TableView may notify it’s delegate when a single row was tapped so the program can take an action. viernes 23 de marzo de 12
33. Coding Standards viernes 23 de marzo de 12
34. Coding Standards viernes 23 de marzo de 12
35. Coding Standards viernes 23 de marzo de 12