My Way to Objective-C

Transcript

1. My Way to Obj-C

2. None

3. programming

4. exp ≈ 15 years

5. but not solid at all ..orz

6. Flash/ActionScript

7. exp ≈ 7 years

8. Ruby

9. exp ≈ 3.5 years

10. Obj-C

11. exp ≈ 2 years

12. real exp ≈ 0.5 years

13. I learn a lot from those languages.

14. Obj-C

15. Obj-C is a dynamic language.

16. OO from smalltalk

17. send message

18. # Ruby class Animal def say_something(words) puts words end end

    cat = Animal.new cat.say_something "hello, world"

19. // Obj-C [cat saySomething: @"Hello, World"];

20. # Ruby cat.send :say_something, "Hello, World"

21. but what if the cat doesn't know how to talk?

22. nil is fine with all messages which it doesn't know

    :)

23. protocol

24. @protocol Talking - (void)saySomething:(NSString *)word; @end

25. // Animal.h @interface Animal<Talking> @end

26. // Animal.m @implement Animal - (void)saySomething:(NSString *)word { // say

    something here.. :) } @end

27. category

28. monkey patching

29. # Ruby class String def say_hi puts "hi, there" end

    end "eddie".say_hi # hi, there

30. // NSString+MyHelloString.h #import <Foundation/Foundation.h> @interface NSString (MyHelloString) - (void) say_hi;

    @end

31. // NSString+MyHelloString.m #import "NSString+MyHelloString.h" @implementation NSString (MyHelloString) -(void) say_hi{ NSLog(@"hi,

    there"); } @end

32. // Cat.h #import "NSString+MyHelloString.h"

33. // Cat.m [@"eddie" say_hi];

34. id

35. dynamic typing

36. // Cat.h @interface Cat - (IBAction)clickButton:(id)sender; @end

37. - (id)init { self = [super init]; if (self) {

    // do some init things here } return self; }

38. block

39. ^

40. # Ruby 10.times { |i| puts i }

41. # obj-c [kids enumerateObjectsUsingBlock:^(id obj, NSUInteger idx, BOOL *stop) {

    // do something }];

42. GCD

43. # obj-c dispatch_queue_t queue = dispatch_queue_create("imageLoadingQueue", NULL); dispatch_async(queue, ^{ //

    start to load image here dispatch_async(dispatch_get_main_queue(), ^{ // image loaded, do something here }); });

44. coding exp from Flash/ ActionScript and Ruby

45. Obj-C and Ruby have the same parent

46. smalltalk

47. I learn dynamic programming from Ruby

48. I learn block from Ruby

49. Obj-C is not difficult to learn.

50. Cocoa Framework is.

51. I learn UI inheritance from Flash/ActionScript

52. https://developer.apple.com/Library/ios/#docum Cocoa/Conceptual/CocoaFundamental CocoaDesignPatterns/CocoaDesignPattern

53. https://developer.apple.com/library/mac/#documentation/Cocoa/Conceptual/CocoaFundamentals/WhatIsCocoa/WhatIsCocoa.html

54. Essential ActionScript 3.0 p.459

55. event handling

56. async handling

57. cocos2d

58. But..

59. delegation

60. Obj-C is subset of C

61. memory management

62. retain v.s release

63. -(NSString *) getBookName { NSString *the_name = @"This is a

    book"; return the_name; }

64. -(NSString *) getBookName { NSString *the_name = @"This is a

    book"; [the_name release]; return the_name; }

65. autorelease http://blog.eddie.com.tw/2010/11/25/autorelease-in-objective-c/

66. -(NSString *) getBookName { NSString *the_name = @"This is a

    book"; return [the_name autorelease]; }
67. None

68. ARC Automatic Reference Counting

69. ARC knows more Obj-C than you :)

70. new style Obj-C syntax

71. literal syntax sugar

72. NSNumber* age = [NSNumber numberWithInt:18];

73. NSNumber* age = @18;

74. NSNumber* pi = [NSNumber numberWithFloat:3.1415926F];

75. NSNumber* pi = @3.1415926F;

76. NSArray* kids = [NSArray arrayWithObjects:@"高思", @"高齊", nil];

77. NSArray* kids = @[@"高思", @"高齊"];

78. NSDictionary* kidsEnglishName = [NSDictionary dictionaryWithObjectsAndKeys: @"Kose", @"高思", @"Coach", @"高齊", nil];

79. NSDictionary* kidsEnglishName = @{@"高思":@"Kose", @"高齊":@"Coach"};

80. // for-loop style NSArray* kids = ... for (int i

    = 0; i < kids.count; ++i) { NSString* kid = [kids objectAtIndex:i]; // do something }

81. // for-in style NSArray* kids = ... for (NSString* kid

    in kids) { // do something }

82. // block style NSArray* kids = ... [kids enumerateObjectsUsingBlock:^(NSString* kid,

    NSUInteger idx, BOOL *stop) { // do something here }];

83. NSDictionary * kidsEnglishName = ... NSArray* keys = [dict allKeys];

    for (NSString* key in keys) { NSString* value = [dict objectForKey:key]; // do something else }

84. // block style NSDictionary * kidsEnglishName = ... [kids enumerateKeysAndObjectsUsingBlock:^(id

    key, id obj, BOOL *stop) { // do something here }];

85. Subscripting Methods

86. NSArray* kids = @[@"高思", @"高齊"]; NSLog(@"%@", [kids objectAtIndex:0]); // 高思

87. NSArray* kids = @[@"高思", @"高齊"]; NSLog(@"%@", kids[0]); // 高思

88. NSMutableArray* kids = [@[@"高思", @"高齊"] mutableCopy]; kids[0] = @"狸貓"; NSLog(@"%@",

    [kids objectAtIndex:0]); // 狸貓

89. NSMutableDictionary* kidsEnglishName = [@{@"高思":@"Kose", @"高齊":@"Coach"} mutableCopy]; kidsEnglishName[@"高思"] = @"Gauss";

90. @synthesize

91. // hello.h @property (nonatomic, strong) NSString* name; // hello.m @synthesize

    name = _name;

92. // hello.h @property (nonatomic, strong) NSString* name; // hello.m @synthesize

    name = _name;
93. None

94. Conclusion

95. there's no BEST or WORST language

96. non of them are useless

97. code more, complain less

98. 完 thank you all :)

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