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My Way to Obj-C

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programming

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exp ≈ 15 years

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but not solid at all ..orz

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Flash/ActionScript

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exp ≈ 7 years

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Ruby

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exp ≈ 3.5 years

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Obj-C

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exp ≈ 2 years

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real exp ≈ 0.5 years

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I learn a lot from those languages.

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Obj-C

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Obj-C is a dynamic language.

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OO from smalltalk

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send message

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# Ruby class Animal def say_something(words) puts words end end cat = Animal.new cat.say_something "hello, world"

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

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

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

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nil is fine with all messages which it doesn't know :)

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protocol

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

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// Animal.h @interface Animal @end

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// Animal.m @implement Animal - (void)saySomething:(NSString *)word { // say something here.. :) } @end

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category

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monkey patching

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

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// NSString+MyHelloString.h #import @interface NSString (MyHelloString) - (void) say_hi; @end

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

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

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

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id

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dynamic typing

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

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- (id)init { self = [super init]; if (self) { // do some init things here } return self; }

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block

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^

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

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# obj-c [kids enumerateObjectsUsingBlock:^(id obj, NSUInteger idx, BOOL *stop) { // do something }];

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GCD

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# 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 }); });

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coding exp from Flash/ ActionScript and Ruby

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Obj-C and Ruby have the same parent

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smalltalk

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I learn dynamic programming from Ruby

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I learn block from Ruby

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Obj-C is not difficult to learn.

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Cocoa Framework is.

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I learn UI inheritance from Flash/ActionScript

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

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

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Essential ActionScript 3.0 p.459

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event handling

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async handling

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cocos2d

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But..

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delegation

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Obj-C is subset of C

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memory management

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retain v.s release

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-(NSString *) getBookName { NSString *the_name = @"This is a book"; return the_name; }

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-(NSString *) getBookName { NSString *the_name = @"This is a book"; [the_name release]; return the_name; }

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

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-(NSString *) getBookName { NSString *the_name = @"This is a book"; return [the_name autorelease]; }

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ARC Automatic Reference Counting

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ARC knows more Obj-C than you :)

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new style Obj-C syntax

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literal syntax sugar

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NSNumber* age = [NSNumber numberWithInt:18];

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NSNumber* age = @18;

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

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NSNumber* pi = @3.1415926F;

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

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NSArray* kids = @[@"高思", @"高齊"];

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

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

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// for-loop style NSArray* kids = ... for (int i = 0; i < kids.count; ++i) { NSString* kid = [kids objectAtIndex:i]; // do something }

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// for-in style NSArray* kids = ... for (NSString* kid in kids) { // do something }

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// block style NSArray* kids = ... [kids enumerateObjectsUsingBlock:^(NSString* kid, NSUInteger idx, BOOL *stop) { // do something here }];

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

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// block style NSDictionary * kidsEnglishName = ... [kids enumerateKeysAndObjectsUsingBlock:^(id key, id obj, BOOL *stop) { // do something here }];

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Subscripting Methods

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

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

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NSMutableArray* kids = [@[@"高思", @"高齊"] mutableCopy]; kids[0] = @"狸貓"; NSLog(@"%@", [kids objectAtIndex:0]); // 狸貓

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

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@synthesize

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

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

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Conclusion

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there's no BEST or WORST language

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non of them are useless

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code more, complain less

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完 thank you all :)

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