Objective-Cひとめぐり

Objective-C

2011 / 3 / 3

Kenji Kinukawa

=> k.kinukawa, k_kinukawa
2010 11
=>
2009
=> Trangram

=>Objective-C

Objective-C

1983 , Stepstone
1985 NeXT Computer
1995 Next Stepstone Obj-C
1997 Apple Next Jobs
Mac OS X
2007 iPhone Obj-C

-wikipedia

iOS Cocoa Touch

iOS
Cocoa
UIKit Touch

&

Foundation

Core OS &

Objective-C
■

■C

■SmallTalk

■

■for, while, if, switch, C
■
■iOS GC
malloc free

■
MyUtil.h
@interface MyUtil{

...
}

...
@end

MyUtil.m
@implementation MyUtil

...
@end

■
MyUtil.h

@interface MyUtil{
int hoge;

}

-(int)sumAB:(int)a adder:(int)b;
-(int)diffAB:(int)a differ:(int)b;

@end

■
MyUtil.m

@implementation MyUtil
-(int)sumAB:(int)a adder:(int)b
{

return a+b;
}

-(int)diffAB:(int)a differ:(int)b
{

return a-b;
}
@end

■

-(double)evaluation:(int)val
{
hoge;
huga;
return buzz;
}

■id
id
id

id obj;
[obj msg];

■

NSString * obj;
[obj hogehuga];

warning: 'NSString' may not respond to '-hogehuga'
NSString -hogehuga

■

* hoge =
[[ alloc] init];

SICP
(define (fact n)
(if (= n 1)
1
(* (fact (- n 1)) n)))

(define (fact2 n)
(define (in-fact n ans)
(if (= n 1)
ans
(in-fact (- n 1) (* ans n))))
(in-fact n 1))

(define (fact3 n)
(define (fact2-iter n ans)
(if (= n 0)
ans
(fact2-iter (- n 1) (* n ans))))
(fact2-iter n 1))

(print (fact3 12000))

■

※

-(double)evaluation:(int)val;

evaluation:
-(double)evaluation:(int)val max:(int)a;

evaluation:max:

■SEL

SEL
SEL

[obj callHoge];

SEL action = @selector(callHoge);
[obj performSelector:action];

■IMP

Obj-C C
IMP

IMP funcp = [foo methodForSelector:

@selector(callHoge)];

xyz =
(*funcp)(foo, @selector(callHoge),nil,nil);

■

Mac Objective-C2.0 GC

[obj retain];
[obj release];

■
interface

@protocol MGVoiceClientDelegate<NSObject>
-(void)mgVoiceClient:(NSURLConnection *)conn didReceiveResponseError:(NSString *)error;
-(void)mgVoiceClient:(NSURLConnection *)conn didFailWithError:(NSError*)error;
-(void)mgVoiceClient:(NSURLConnection *)conn didFinishGetting:(NSArray *)voices;
-(void)mgVoiceClient:(NSURLConnection *)conn didFinishPosting:(id)reply;
@end

@interface VoiceTableViewController : UITableViewController <MGVoiceClientDelegate>{

MGVoiceClient * voiceClient;

NSArray * voiceArray;
}

■

Not
NSString+Parse.h

@interface NSString (Parse)
-(NSDictionary)parseJson:(NSString *)str;
-(NSDictionary)parseXml:(NSString *)str;
-(NSDictionary)parseYaml:(NSString *)str;
@end

[str parseJson:jsonStr];

NSString Parse

■
NSString+Parse.h

@interface NSString (Parse)
-(NSDictionary)parseJson:(NSString *)str;
-(NSDictionary)parseXml:(NSString *)str;
-(NSDictionary)parseYaml:(NSString *)str;
@end

[str parseJson:jsonStr];

NSString Parse

■

Cocoa

A B

method A
method B

■

A B

method A

Obj-C

■

A B

method A method A

delegate
B

Obj-C

■
@protocol MGVoiceDelegate;

@interface MGVoice : NSObject{
@public

id <MGVoiceDelegate> delegate;
}
@end

-(void)mgCommentClient:(NSURLConnection *)conn didFinishGetting:(NSArray *)commentArray{

if([delegate respondsToSelector:@selector(mgVoice:didFinishGettingComments:)]){

[delegate mgVoice:conn didFinishGettingComments:commentArray];

}
}

- (void)viewDidLoad {
[super viewDidLoad];

voice.delegate = self;
}

-(void)mgVoice:(NSURLConnection *)conn didFinishGettingComments:(NSArray *)commentArray{

if([commentArray count]>0){

MGComment * comment = [commentArray objectAtIndex:0];

commentText.text = comment.commentText;

}else{

commentText.text = @" ";

}
}

■Blocks
Apple C ISO
LLVM iOS4.0
LLVM Compiler 2.0
LLVM
LLVM 2.0
C Objective-C C++

LLVM GCC 2

Xcode 4 LLVM IDE
LLVM
Xcode IDE C C++ Objective-C

block lambda

■Blocks
void (^b)() = ^{

printf("im in blockn");
};
b();

■Blocks
void (^b)() = ^{

printf("im in blockn");
};
b();

C
Block
Block_copy(),Block_release()

iOS4 Blocks

ex)
GCD( )

■
mixi graph API
mixi graph API iPhone

※

Objective-Cひとめぐり

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Editor's Notes