My Way to Objective-C

Transcript

1. My Way to Obj-C
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]; }
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;
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 :)
99. 高見見龍龍 Conacts photo by Eddie Websie Blog Plurk Facebook Google Plus Twiter Email Mobile http://www.eddie.com.tw http://blog.eddie.com.tw http://www.plurk.com/aquarianboy http://www.facebook.com/eddiekao http://www.eddie.com.tw/+ https://twiter.com/#!/eddiekao eddie@digik.com.tw +886-928-617-687