My Way to Objective-C

Transcript

1. 1.

   My Way to Obj-C

2. 2.

   None
3. 3.

   programming

4. 4.

   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<Talking> @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 <Foundation/Foundation.h> @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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    None
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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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    None
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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 :)

99. 99.

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