Tips & Tricks for iPhone Application Development

Presentation shown during a SkillsMatter event in London, United Kingdom.

Transcript

1. Tips & Tricks
   for iPhone Application
   Development
   Skills Matter - London - February 2nd 2010
   

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3. Adrian
   Kosmaczewski
   

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

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5. @akosma
   

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7. some questions
   

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8. new to iPhone?
   

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9. designer?
   developer?
   

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10. technologies?
    

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

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12. programming
    languages?
    

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

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15. Dev Days for iPhone
    

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16. Mon, April 26th 2010
    

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17. Win a free ticket!
    

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18. Fill your evaluation
    form! :)
    

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20. iPhone dev
    ≠
    web dev
    

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22. Cocoa &
    Objective-C
    

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23. born in the 80s
    

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28. Objective-C
    

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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?)
    

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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
    

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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
    

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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
    

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45. ~70 MB for the OS!
    

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46. no swap file
    

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47. (no virtual memory)
    

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48. no garbage collector
    

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49. (manual memory
    management)
    

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

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

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52. // C++
    // Memory freed when out of scope
    std::string name(“Adrian”);
    std::string *name = NULL;
    name = new std::string(“Adrian”);
    delete name;
    

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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
    

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73. (cheaper
    maintenance)
    

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75. iPhone ≠ computer
    

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

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

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

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79. Mobile HIG
    

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80. now more important
    than ever!
    

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85. NDA
    

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87. books
    

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97. thanks!
    

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98. Please fill your
    evaluation forms!
    

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99. (you could win a ticket)
    

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100. questions?
     

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