Tips & Tricks for iPhone Application Development

Presentation shown in Copenhagen, Denmark.

Transcript

1. tips & tricks for iPhone application development
3. adrian kosmaczewski
4. akosma software akosma.com akosma.tumblr.com github.com/akosma linkedin.com/in/akosma facebook.com/akosma
5. @akosma
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?
15. iPhone dev ≠ web dev
17. Cocoa & Objective-C
18. born in the 80s
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
30. iPhone Specifics
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
43. memory warnings
45. avoid autorelease
48. lazy-loading & reuse
50. custom table cells & reuse
52. override setters properly
54. beware of delegation
56. instruments & static analysis
58. warnings as errors
60. code organization
61. (cheaper maintenance)
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/
68. books
78. thanks!
79. questions?