Tips & Tricks for iPhone Application Development

Transcript

1. tips & tricks for iPhone application development

2. None

3. adrian kosmaczewski

4. akosma software akosma.com akosma.tumblr.com github.com/akosma linkedin.com/in/akosma facebook.com/akosma

5. @akosma

6. None

7. some questions

8. @perlausten? @supermouse? @williwu?

9. new to iPhone?

10. technologies?

11. J2EE, J2ME, .NET, RoR, others?

12. programming languages?

13. C / C++? Java, C#? Ruby, Python, Lua? JavaScript?

14. None

15. iPhone dev ≠ web dev

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17. Cocoa & Objective-C

18. born in the 80s

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23. Objective-C

24. Objective-C Java @interface & @implementation class @protocol interface #import //

    files! import // classes! categories n/a id n/a

25. • Thin layer around C • Message-dispatch runtime • Static

    and dynamic (you choose) • The “real” father of Java: • http://cs.gmu.edu/~sean/stuff/java-objc.html

26. • Single inheritance + interfaces (“@protocols”) • @protocols can have

    optional methods • Fields protected by default • All methods are virtual and overridable • Methods can be added to existing classes • Full introspection / reflection • Messages can be intercepted and forwarded • à la AOP!

27. Cocoa Touch

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30. iPhone Specifics

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32. 128 or 256 MB RAM

33. ~70 MB for the OS!

34. no swap file

35. (no virtual memory)

36. no garbage collector

37. (manual memory management)

38. http://cocoadevcentral.com/d/learn_objectivec/

39. no automatic objects on the stack (C++)

40. // C++ // Memory freed when out of scope std::string

    name(“Adrian”); std::string *name = NULL; name = new std::string(“Adrian”); delete name;

41. hygiene

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43. memory warnings

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45. avoid autorelease

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48. lazy-loading & reuse

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50. custom table cells & reuse

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52. override setters properly

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54. beware of delegation

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56. instruments & static analysis

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58. warnings as errors

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60. code organization

61. (cheaper maintenance)

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63. iPhone ≠ computer

64. http://www.flickr.com/photos/oskay/365607662/

65. http://www.flickr.com/photos/blakespot/2379207825/

66. http://www.flickr.com/photos/oskay/365607591/

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68. books

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78. thanks!

79. questions?