ARCでめちゃモテiOSプログラマー

ARC iOS (id:ninjinkun / @ninjinkun)

• Cocoa Touch• ARC• ARC•• ARC•• Tips• GC

Cocoa Touch • retain / relase -(void)setName:(NSString *)newName { name = [newName retain]; } -(void)dealloc { [name release]; [super dealloc]; 1 3 0 } • Ownership • Ownership retain • Ownership release • 0

Cocoa TouchAutorelase • • autorelease • release • / •

Cocoa TouchAutorelase • • autorelease • release • / • -(void)buildNewName { NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init]; NSMutableArray *array = [[[NSMutableArray alloc] init] autorelease]; [array addObject:@"hoge"]; [array addObject:@"fuga"]; [array addObject:@"piyo"]; name =[array componentsJoinedByString:@","]; [pool drain]; }

ARC• Automatic Reference Counting•• iOS 5 / Mac OS X 10.7

ARC• •• (GC)• Static Analyzer

ARC• @interface NonARCObject : NSObject { NSString *name; } -(id)initWithName:(NSString *)name; @end @implementation NonARCObject -(id)initWithName:(NSString *)newName { self = [super init]; if (self) { name = [newName retain]; } return self; } -(void)dealloc { [name release]; [super dealloc]; } @end

ARC• @interface ARCObject : NSObject { NSString *name; } -(id)initWithName:(NSString *)name; @end @implementation ARCObject -(id)initWithName:(NSString *)newName { self = [super init]; if (self) { name = newName; } return self; } @end

ARCARC • • … • • • •

ARC __strong•• Ownership• • retain, release -(void)buildNewName { { __strong NSMutableArray *array = [[NSMutableArray alloc] init]; [array addObject:@"hoge"]; [array addObject:@"fuga"]; [array addObject:@"piyo"]; name =[array componentsJoinedByString:@","]; } } !

ARC __strong• • retain, dealloc relase @interface ARCUser : NSObject { __strong NSString *name; } @end @implementation ARCUser -(id)initWithName:(NSString *)newName { self = [super init]; if (self) { name = newName; // [newName retain] } return self; } -(void)dealloc { // [name release] } @end

ARC __weak• __weak • • Ownership • nil • • iOS 5 @interface ARCUser : NSObject { __weak id delegate; } @end

ARC __unsafe_unretainded• • assign•• iOS 4.3 @interface ARCUser : NSObject { __unsafe_unretained id delegate; } @end

ARC __autoreleasing• autorelase•• @autorelasepool { } -(NSArray *)comvertImageToJpeg:(NSArray *)files { NSMutableArray *dataStore = [NSMutableArray array]; @autoreleasepool { for (NSString *filePath in files) { __autoreleasing UIImage *image = [[UIImage alloc] initWithContentsOfFile:filePath]; NSData *data = UIImageJPEGRepresentation(image, 1.0); [dataStore addObject:data]; } } return [dataStore copy]; }

ARC• retain, release, autorelase • retainCount• [super dealloc] • dealloc -(void)dealloc { delegate = nil; }• C __bridge NSString *str = @"hogehoge"; CFStringRef strRef = (__bridge CFStringRef)str; CFStringRef strRef = (__bridge_retained CFStringRef)str;

• ARC __strong• __strong __strong __strong __strong __strong __strong

• iOS 5 __weak• iOS 4.3 __unsafe_unretaind• nil __strong __weak __strong __strong __strong

ARC•

ARCretain / relase • -S • • _objc_release() • _objc_retain() • _objc_retainAutoreleasedReturnValue()

ARC__weak • _objc_storeWeak() • 0 _objc_destroyWeak() • • nil • This document is licensed to ninjin@mac.com.

Blocks • ARC • self ? • • release • BlocksKit UIButton *button = [UIButton buttonWithType:UIButtonTypeCustom]; [button addEventHandler:^(id sender) { [self showPhotoPickerView]; } forControlEvents:UIControlEventTouchUpInside]; [self.view addSubview:button];

Blocks • UIButton *button = [UIButton buttonWithType:UIButtonTypeCustom]; __unsafe_unretained id _self = self; // !? [button addEventHandler:^(id sender) { [_self showPhotoPickerView]; } forControlEvents:UIControlEventTouchUpInside]; [self.view addSubview:button];

Blocks • UIButton *button = [UIButton buttonWithType:UIButtonTypeCustom]; __unsafe_unretained id _self = self; // !? [button addEventHandler:^(id sender) { !? [_self showPhotoPickerView]; } forControlEvents:UIControlEventTouchUpInside]; [self.view addSubview:button];

TipsARC • -fno-objc-arc

TipsARC • Static Library • Static Library • Workspace

Tips • ARC • iOS 5 __weak • Blocks • UI • UI Blocks

GC• GC • iOS •• • CPU

• ARC• ( )• __weak• GC • • ( )• ARC

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ARCでめちゃモテiOSプログラマー

by Satoshi Asano

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