Tips & Tricks for iPhone Application Development

Transcript

1. Tips & Tricks for iPhone Application Development Skills Matter -

   London - February 2nd 2010
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

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7. some questions

8. new to iPhone?

9. designer? developer?

10. technologies?

11. Android J2EE J2ME .NET Ruby on Rails others?

12. programming languages?

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

14. None

15. Dev Days for iPhone

16. Mon, April 26th 2010

17. Win a free ticket!

18. Fill your evaluation form! :)

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20. iPhone dev ≠ web dev

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22. Cocoa & Objective-C

23. born in the 80s

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28. Objective-C

29. Objective-C Java @interface & @implementation class (1 file) @protocol interface

    #import // files! import // classes! categories n/a (in C#, “class extensions”) id n/a (generics?)

30. Objective-C Java @selector n/a NSObject / NSProxy / ... Object

    @public / @protected / @private public / protected / private @try / @catch / @finally NSException try / catch / finally Exception n/a package / namespace

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

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

32. • 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
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37. Demo

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39. Cocoa Touch

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42. iPhone Specifics

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44. 128 or 256 MB RAM

45. ~70 MB for the OS!

46. no swap file

47. (no virtual memory)

48. no garbage collector

49. (manual memory management)

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

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

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

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

53. hygiene

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55. memory warnings

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57. avoid autorelease

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60. lazy-loading & reuse

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62. custom table cells & reuse

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64. override setters properly

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66. beware of delegation

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68. instruments & static analysis

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70. warnings as errors

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72. code organization

73. (cheaper maintenance)

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75. iPhone ≠ computer

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

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

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

79. Mobile HIG

80. now more important than ever!

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85. NDA

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87. books

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97. thanks!

98. Please fill your evaluation forms!

99. (you could win a ticket)

100. questions?