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
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. 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?
15. Dev Days for iPhone
16. Mon, April 26th 2010
17. Win a free ticket!
18. Fill your evaluation form! :)
20. iPhone dev ≠ web dev
22. Cocoa & Objective-C
23. born in the 80s
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
37. Demo
39. Cocoa Touch
42. iPhone Specifics
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
55. memory warnings
57. avoid autorelease
60. lazy-loading & reuse
62. custom table cells & reuse
64. override setters properly
66. beware of delegation
68. instruments & static analysis
70. warnings as errors
72. code organization
73. (cheaper maintenance)
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!
85. NDA
87. books
97. thanks!
98. Please fill your evaluation forms!
99. (you could win a ticket)
100. questions?