{"id":689,"date":"2017-01-08T04:21:31","date_gmt":"2017-01-07T19:21:31","guid":{"rendered":"http:\/\/www.uturtle.com\/blog\/?p=689"},"modified":"2017-01-12T02:27:18","modified_gmt":"2017-01-11T17:27:18","slug":"modern-objective-c%ec%9c%bc%eb%a1%9c-%eb%a6%ac%ed%8c%a9%ed%86%a0%eb%a7%81","status":"publish","type":"post","link":"https:\/\/www.jinukbaek.com\/blog\/ko\/archives\/689","title":{"rendered":"[\ubc88\uc5ed] Modern Objective-C \uad6c\ubb38\uc73c\ub85c \ub9ac\ud329\ud1a0\ub9c1"},"content":{"rendered":"

\uc54c\ub9bc<\/strong>
\n\uc774 \uae00\uc740 Qiita\uc5d0 \uac8c\uc2dc\ub41c “Modern Objective-C \u30d3\u30d5\u30a9\u30fc\u30a2\u30d5\u30bf\u30fc”(http:\/\/qiita.com\/makoto_kw\/items\/d86fada0e38e9245912a<\/a>\u00a0, 2014-04-16 \uc218\uc815\ubcf8 \uae30\uc900), makoto_kw\ub2d8\uc774 \uc791\uc131\ud55c \uae00\uc744 \ubc88\uc5ed\ud55c \uac83\uc785\ub2c8\ub2e4.<\/p><\/blockquote>\n

Objective-C \uc5b8\uc5b4\ub294 2017\ub144 \ud604\uc7ac\ub3c4 \uc5ec\uc804\ud788 \ub9ce\uc740 \uc218\uc758 \uc0ac\uc6a9\uc790\uac00 \uc0ac\uc6a9\ud558\uace0 \uc788\ub294 \uc5b8\uc5b4\uc774\ub2e4[1]. \ucd5c\uadfc Objective-C\uc758 \uad00\uc2ec\uc774 Swift\uc758 \uc601\ud5a5\uc73c\ub85c \uadfc\ub798\uc758 \uc6f9\uc5d0\uc11c \ucd5c\uadfc \uc790\ub8cc\ub97c \ucc3e\uae30 \ud798\ub4e0 \uac83\uc774 \uc0ac\uc2e4\uc774\ub2e4. \uc774 \uc790\ub8cc\ub294 \uaf64 \uc624\ub798\ub41c \uac83\uc774\uc9c0\ub9cc \ud68c\uc0ac\uc5d0\uc11c \ucf54\ub4dc \ub9ac\ud329\ud1a0\ub9c1 \uc5c5\ubb34\ub97c \ud558\uba74\uc11c modern objective-c \ud615\uc2dd\uc73c\ub85c \ubcc0\uacbd\uc774 \ud544\uc694\ud558\uc5ec \ucc38\uc870\ud55c \uc790\ub8cc\uc774\ub2e4. \uc774\ub97c \uc0ac\uc6a9\ud558\uba74 \uae30\uc874 \ubc29\uc2dd\uc5d0 \ube44\ud574 \ucf54\ub4dc\uc758 \uae38\uc774\ub97c \ub9ce\uc774 \uc904\uc77c \uc218 \uc788\uc73c\uba70 \ubd88\ud544\uc694\ud55c \uc120\uc5b8 \ucf54\ub4dc\ub97c \uc904\uc77c \uc218 \uc788\ub2e4\ub294 \uac83\uc744 \uc54c\uac8c\ub420 \uac83\uc774\ub2e4. \ubb3c\ub860 \uc774 \ubc29\ubc95\uc774 \ub098\uc628\uc9c0 \uaf64 \uc624\ub798\ub418\uc5c8\uae30 \ub54c\ubb38\uc5d0 \uc544\ub9c8 \ub300\ubd80\ubd84\uc758 Objective-C \uac1c\ubc1c\uc790\ub4e4\uc740 \uc54c\uace0 \uc788\uc744 \uac83\uc73c\ub85c \uc608\uc0c1\ub418\uc9c0\ub9cc \uc544\uc9c1 \uc774 \uc0ac\uc2e4\uc5d0 \ub300\ud558\uc5ec \uc54c\uc9c0 \ubabb\ud558\ub294 \ubd84\ub4e4\uc744 \uc704\ud574 \ub3c4\uc6c0\uc774 \ub420 \uc218 \uc788\uc5c8\uc73c\uba74 \uc88b\uaca0\ub2e4.<\/p>\n

Adopting Modern Objective-C<\/a><\/h1>\n

instancetype<\/h2>\n

instancetype<\/code> \ub97c \uc0ac\uc6a9\ud558\uba74 \ucef4\ud30c\uc77c\ub7ec\uac00 \ud0c0\uc785 \uccb4\ud06c\uac00 \uac00\ub2a5\ud568<\/p>\n

@interface MyObject\r\n- (id)myFactoryMethod;\r\n@end\r\n<\/code><\/pre>\n
\u2193<\/p>\n
@interface MyObject\r\n- (instancetype)myFactoryMethod;\r\n@end\r\n<\/code><\/pre>\n
Enumeration Macros<\/h2>\n
“iOS6 SDK”\ubd80\ud130 \ucd94\uac00\ub41c \ub9e4\ud06c\ub85c<\/p>\n
enum {\r\n    UITableViewCellStyleDefault,\r\n    UITableViewCellStyleValue1,\r\n    UITableViewCellStyleValue2,\r\n    UITableViewCellStyleSubtitle\r\n};\r\ntypedef NSInteger UITableViewCellStyle;\r\n<\/code><\/pre>\n
\u2193<\/p>\n
typedef NS_ENUM(NSInteger, UITableViewCellStyle) {\r\n    UITableViewCellStyleDefault,\r\n    UITableViewCellStyleValue1,\r\n    UITableViewCellStyleValue2,\r\n    UITableViewCellStyleSubtitle\r\n};\r\n<\/code><\/pre>\n
bitmask\ub294 NS_OPTIONS<\/code> \ub97c \uc0ac\uc6a9<\/p>\n
enum {\r\n    UIViewAutoresizingNone                 = 0,\r\n    UIViewAutoresizingFlexibleLeftMargin   = 1 << 0,\r\n    UIViewAutoresizingFlexibleWidth        = 1 << 1,\r\n    UIViewAutoresizingFlexibleRightMargin  = 1 << 2,\r\n    UIViewAutoresizingFlexibleTopMargin    = 1 << 3,\r\n    UIViewAutoresizingFlexibleHeight       = 1 << 4,\r\n    UIViewAutoresizingFlexibleBottomMargin = 1 << 5\r\n};typedef NSUInteger UIViewAutoresizing;\r\n<\/code><\/pre>\n
\u2193<\/p>\n
typedef NS_OPTIONS(NSUInteger, UIViewAutoresizing) {\r\n    UIViewAutoresizingNone                 = 0,\r\n    UIViewAutoresizingFlexibleLeftMargin   = 1 << 0,\r\n    UIViewAutoresizingFlexibleWidth        = 1 << 1,\r\n    UIViewAutoresizingFlexibleRightMargin  = 1 << 2,\r\n    UIViewAutoresizingFlexibleTopMargin    = 1 << 3,\r\n    UIViewAutoresizingFlexibleHeight       = 1 << 4,\r\n    UIViewAutoresizingFlexibleBottomMargin = 1 << 5};\r\n<\/code><\/pre>\n
\n
Migrating to Modern Objective-C<\/a><\/h1>\n
Importing Headers<\/h2>\n
#import <Foundation\/NSObject.h>\r\n#import <Foundation\/NSString.h> \/\/or @class NSString;\r\n<\/code><\/pre>\n
\u2193<\/p>\n
#import <Foundation\/Foundation.h>\r\n<\/code><\/pre>\n
<\/h2>\n
Accessor Methods<\/h2>\n
\ud56d\uc0c1 \uc5d1\uc138\uc11c \uba54\uc18c\ub4dc\ub97c \uc0ac\uc6a9\ud558\ub77c. \ub2e8, initializer\ub791 dealloc\uc548\uc740 \ud53c\ud55c\ub2e4.<\/p>\n
- (void)myMethod {\r\n    \/\/ ...\r\n    [self setTitle:[NSString stringWithFormat:@\"Area: %1.2f\", [self area]]];\r\n    \/\/ ...\r\n}\r\n<\/code><\/pre>\n
\u2193<\/p>\n
- (void)myMethod {\r\n    \/\/ ...\r\n    self.title = [NSString stringWithFormat:@\"Area: %1.2f\", self.area];\r\n    \/\/ ...\r\n}\r\n<\/code><\/pre>\n
<\/h2>\n
Memory Management<\/h2>\n
ARC\ub97c \uc0ac\uc6a9\ud55c\ub2e4. ARC\uc740 Xcode 4.2(LLVM compiler 3.0)\ubd80\ud130 \uc9c0\uc6d0\ud55c\ub2e4. \uc77c\ubd80\uae30\ub2a5\uc740 \ucef4\ud30c\uc77c\ub7ec \ub9cc\uc73c\ub85c \ud574\uacb0\uc774 \uc548\ub418\uae30 \ub54c\ubb38\uc5d0 iOS5 \uc774\uc0c1\uc744 \uc9c0\uc6d0\ud574\uc57c \ud55c\ub2e4.<\/p>\n
NSMutableArray *array = [[NSMutableArray alloc] init];\r\n\/\/ Use the array\r\n[array release];\r\n\r\n\/\/ or \r\n\r\nNSMutableArray *array = [[[NSMutableArray alloc] init] autoelease];\r\n\/\/ Use the array\r\n<\/code><\/pre>\n
\u2193<\/p>\n
NSMutableArray *array = [NSMutableArray array];\r\n\/\/ Use the array\r\n<\/code><\/pre>\n
<\/h2>\n
id heisenObject = [[array objectAtIndex:n] retain];\r\n[array removeObjectAtIndex:n];\r\n\/\/ ...\r\n[heisenObject doSomething];\r\n[heisenObject release];\r\n\/\/ ...\r\n<\/code><\/pre>\n
\u2193<\/p>\n
id heisenObject = [array objectAtIndex:n];\r\n[array removeObjectAtIndex:n];\r\n\/\/ ...\r\n[heisenObject doSomething];\r\n\/\/ ...\r\n<\/code><\/pre>\n
\n
- (void)takeLastNameFrom:(Person *)person {\r\n    NSString *oldLastname = [[self lastName] retain];\r\n    [self setLastName:[person lastName]];\r\n    NSLog(@\"Lastname changed from %@ to %@\", oldLastname, [self lastName]);\r\n    [oldLastName release];\r\n}\r\n<\/code><\/pre>\n
\u2193<\/p>\n
- (void)takeLastNameFrom:(Person *)person {\r\n    NSString *oldLastname = [self lastName];\r\n    [self setLastName:[person lastName]];\r\n    NSLog(@\"Lastname changed from %@ to %@\", oldLastname, [self lastName]);\r\n}\r\n<\/code><\/pre>\n
<\/h2>\n
CFUUIDRef cfUUID = CFUUIDCreate(NULL);\r\nNSString *noteUUID = (NSString *)CFUUIDCreateString(NULL, cfUUID);\r\nCFRelease(cfUUID);\r\n<\/code><\/pre>\n
\u2193<\/p>\n
CFUUIDRef cfUUID = CFUUIDCreate(NULL);\r\nNSString *noteUUID = (__bridge_transfer NSString *)CFUUIDCreateString(NULL, cfUUID);\r\nCFRelease(cfUUID);\r\n<\/code><\/pre>\n
<\/h2>\n
Properties<\/h2>\n
property<\/code>\uc120\uc5b8 \ubc0f \uad6c\ud604\uc5d0\uc11c\ub294 synthesize<\/code>\ub97c \uc0ac\uc6a9\ud55c\ub2e4. \uc778\uc2a4\ud134\uc2a4 \ubcc0\uc218\uc5d0 \uc9c1\uc811 \uc561\uc138\uc2a4\ub97c \ud558\uace0 \uc2f6\uc744 \ub54c\uc5d0\ub294 @synthesize title = _title;<\/code>\ub85c \ud558\uc5ec _title<\/code> \ubcc0\uc218\ub97c \uc0ac\uc6a9\ud55c\ub2e4. \uc774 \ub54c _title<\/code> \uc740 \uc120\uc5b8\ud558\uc9c0 \uc54a\ub354\ub77c\ub3c4 \ucef4\ud30c\uc77c\ub7ec\uac00 \ucc98\ub9ac\ud574 \uc900\ub2e4. \ub610\ud55c, @synthesize<\/code> \uc790\uccb4\ub97c \uc0dd\ub7b5\ud558\ub294 \uac83\ub3c4 \ubb34\ubc29\ud558\ub2e4(Xcode 4.4 – Apple LLVM 4.0 Compiler\ubd80\ud130 \uc9c0\uc6d0).<\/p>\n
\ud55c \uac00\uc9c0 \uc0dd\uac01\ud560 \uc810\uc73c\ub85c, \ubcc0\uc218 _title<\/code>\ub97c \uc9c1\uc811 \ucc38\uc870\uc6a9, \ud504\ub85c\ud37c\ud2f0 self.title = ...<\/code>(setter)\ub97c \uac12\uc744 \ubcc0\uacbd\uc6a9\uc73c\ub85c \uc0ac\uc6a9\ud560 \uc218 \uc788\uc74c\uff08initializer\uc640 dealloc\ub294 \ud53c\ud568)<\/p>\n
@interface Thing : NSObject {\r\n  NSString *title;\r\n}\r\n- (NSString *)title;\r\n- (void)setTitle:(NSString *)newTitle;\r\n@end\r\n\r\n@implementation Thing\r\n- (NSString *)title {\r\n    return title;\r\n}\r\n- (void)setTitle:(NSString *)newTitle {\r\n    if (title != newTitle) {\r\n        [title release];\r\n        title = [newTitle copy];\r\n    }\r\n}\r\n@end\r\n<\/code><\/pre>\n
\u2193<\/p>\n
@interface Thing : NSObject \r\n@property (copy) NSString *title;\r\n@end\r\n\r\n@implementation Thing\r\n@synthesize title;\r\n@end\r\n<\/code><\/pre>\n
\n
@interface Thing : NSObject {\r\n    float radius;\r\n}\r\n- (float)radius;\r\n- (void)setRadius:(float)newValue;\r\n- (float)area;\r\n@end\r\n\r\n@implementation Thing\r\n- (float)radius {\r\n    return radius;\r\n}\r\n- (void)setRadius:(float)newValue {\r\n    radius = newValue;\r\n}\r\n- (float)area {\r\n    return M_PI * pow(radius, 2.0);\r\n}\r\n@end\r\n<\/code><\/pre>\n
\u2193<\/p>\n
@interface Thing : NSObject\r\n@property float radius;\r\n@property (readonly, nonatomic) float area;\r\n@end\r\n\r\n@implementation Thing\r\n@synthesize radius;\r\n- (float)area {\r\n    return M_PI * pow(self.radius, 2.0)\r\n;}\r\n@end\r\n<\/code><\/pre>\n
\n
@interface Thing : NSObject {\r\n    id delegate;\r\n}\r\n- (id)delegate;\r\n- (void)setDelegate:(id)newDelegate;\r\n@end\r\n\r\n@implementation Thing\r\n- (id)delegate {\r\n    return delegate;\r\n}\r\n- (void)setDelegate:(id)newDelegate {\r\n    delegate = newDelegate;\r\n}\r\n@end\r\n<\/code><\/pre>\n
\u2193<\/p>\n
@interface Thing : NSObject\r\n@property (weak) id delegate;\r\n@end\r\n\r\n@implementation Thing\r\n@synthesize delegate;\r\n@end\r\n<\/code><\/pre>\n
Private State<\/h2>\n
Private \ubcc0\uc218\ub294 \ud074\ub798\uc2a4 \uc775\uc2a4\ud150\uc158 \ub0b4\uc5d0 property\ub85c \uc120\uc5b8\ud55c\ub2e4. \uba54\uc18c\ub4dc\ub3c4 \ub9c8\ucc2c\uac00\uc9c0\ub85c \ud074\ub798\uc2a4 \uc775\uc2a4\ud150\uc158\uc744 \uc0ac\uc6a9\ud55c\ub2e4.<\/p>\n
@interface Thing {\r\n   BOOL privateTest;\r\n}\r\n<\/code><\/pre>\n
\u2193<\/p>\n
@interface Thing ()\r\n@property BOOL privateTest;\r\n@end\r\n\/\/ ...\r\n<\/code><\/pre>\n
\n
@interface Thing (PrivateMethods)\r\n- (void)doSomethingPrivate;\r\n- (void)doSomethingElsePrivate;\r\n@end\r\n<\/code><\/pre>\n
\u2193<\/p>\n
@interface Thing ()\r\n- (void)doSomethingPrivate;\r\n- (void)doSomethingElsePrivate;\r\n@end\r\n<\/code><\/pre>\n
Outlets<\/h2>\n
\uba54\ubaa8\ub9ac \uad00\ub9ac\ub97c \uc704\ud574 strong, weak\ub85c property\ub97c \uc120\uc5b8\ud55c\ub2e4.<\/p>\n
@interface MyViewController : MySuperclass {\r\n    IBOutlet ElementClass *uiElement;\r\n}\r\n@end\r\n<\/code><\/pre>\n
\u2193<\/p>\n
@interface MyViewController : MySuperclass\r\n@property (weak) IBOutlet ElementClass *uiElement;\r\n@end\r\n<\/code><\/pre>\n
Initializer Methods and dealloc<\/h2>\n
\ucd08\uae30\ud654\uc640 \ud574\uc81c\ub294 \uc561\uc138\uc11c\ub97c \uc4f0\uc9c0 \uc54a\uace0 \ubcc0\uc218\ub85c \ud55c\ub2e4.<\/p>\n
- (id)init {\r\n    if (self = [super init]) {\r\n        [self setTitle:@\"default\"];\r\n    }\r\n    return self;\r\n}\r\n<\/code><\/pre>\n
\u2193<\/p>\n
- (id)init {\r\n    self = [super init];\r\n    if (self) {\r\n        _title = @\"default\";\r\n    }\r\n    return self;\r\n}\r\n<\/code><\/pre>\n
\n
- (void)dealloc {\r\n    [self setTitle:nil];\r\n    [super dealloc];\r\n}\r\n<\/code><\/pre>\n
\u2193<\/p>\n
- (void)dealloc {\r\n    [_title release];\r\n    [super dealloc];\r\n}\r\n<\/code><\/pre>\n
Protocols<\/h2>\n
\ud544\uc218\ub294 \uc544\ub2cc \uad6c\ud604\ud558\uc9c0 \uc54a\uc740 \uba54\uc18c\ub4dc\uac00 \uc788\uae30 \ub54c\ubb38\uc5d0 id\ub97c \uadf8\ub300\ub85c \uc0ac\uc6a9\ud558\uc9c0 \ub9d0\uace0 optional\uc120\uc5b8\uc744 \uc0ac\uc6a9\ud574\uc11c id\ud615\uc5d0 \uc81c\ub300\ub85c protocol\uc744 \uc9c0\uc815\ud55c\ub2e4.<\/p>\n
@ButlerProtocol\r\n- (void)makeTea;\r\n- (void)serveSandwiches;\r\n- (void)mowTheLawn;\r\n@end\r\n<\/code><\/pre>\n
\u2193<\/p>\n
@protocol ButlerProtocol <NSObject>\r\n- (void)makeTea;\r\n- (void)serveSandwiches;\r\n@optional\r\n- (void)mowTheLawn;\r\n@end\r\n<\/code><\/pre>\n
- (id <ButlerProtocol>)butler;\r\n<\/code><\/pre>\n
\u2193<\/p>\n
@property id <ButlerProtocol> butler;\r\n<\/code><\/pre>\n
Collections and Literals<\/h2>\n
@<\/code> \ub9ac\ud130\ub7f4 \uad6c\ubb38\uacfc []<\/code> \ucc38\uc870\uad6c\ubb38\uc740 Xcode 4.4(Apple LLVM 4.0 Compiler)\ubd80\ud130 \uc9c0\uc6d0\ud588\uc73c\ub098 iOS\uc5d0 \uc0ac\uc6a9\ud560 \uc218 \uc788\uac8c \ub41c\uac74 Xcode4.5 \ubd80\ud130\uc774\ub2e4.<\/p>\n
NSNumber *aNumber = [NSNumber numberWithFloat:2.3];\r\n<\/code><\/pre>\n
\u2193<\/p>\n
NSNumber *aNumber = @2.3f;\r\n<\/code><\/pre>\n
\n
NSNumber *anotherNumber = [NSNumber numberWithFloat:x];\r\n<\/code><\/pre>\n
\u2193<\/p>\n
NSNumber *anotherNumber = @(x);\r\n<\/code><\/pre>\n
\n
NSArray *anArray = [NSArray arrayWithObjects:aThing, @\"A String\",\r\n                       [NSNumber numberWithFloat:3.14], nil];\r\n<\/code><\/pre>\n
\u2193<\/p>\n
NSArray *anArray = @[ aThing, @\"A String\", @3.14 ];\r\n<\/code><\/pre>\n
\n
NSDictionary *aDictionary = [NSDictionary dictionaryWithObjectsAndKeys:\r\n                                value, @\"Key\",\r\n                                [NSNumber numberWithBOOL:YES], @\"OtherKey\",                                nil];\r\n<\/code><\/pre>\n
\u2193<\/p>\n
objectivec:afterNSDictionary *aDictionary = @{ @\"Key\" : value, @\"OtherKey\" : @YES };\r\n<\/code><\/pre>\n
\n
NSDictionary *distanceDict = [NSDictionary dictionaryWithObjectsAndKeys:            [NSNumber numberWithDouble:  0.0], kCIAttributeMin,\r\n            [NSNumber numberWithDouble:  1.0], kCIAttributeMax,\r\n            [NSNumber numberWithDouble:  0.0], kCIAttributeSliderMin,\r\n            [NSNumber numberWithDouble:  0.7], kCIAttributeSliderMax,\r\n            [NSNumber numberWithDouble:  0.2], kCIAttributeDefault,\r\n            [NSNumber numberWithDouble:  0.0], kCIAttributeIdentity,\r\n            kCIAttributeTypeScalar,            kCIAttributeType,\r\n            nil];\r\n<\/code><\/pre>\n
\u2193<\/p>\n
NSDictionary *distanceDict = @{\r\n        kCIAttributeMin       : @0.0,\r\n        kCIAttributeMax       : @1.0,\r\n        kCIAttributeSliderMin : @0.0,\r\n        kCIAttributeSliderMax : @0.7,\r\n        kCIAttributeDefault   : @0.2,\r\n        kCIAttributeIdentity  : @0.0,\r\n        kCIAttributeType      : kCIAttributeTypeScalar\r\n};\r\n<\/code><\/pre>\n
\n
NSDictionary *slopeDict = [NSDictionary dictionaryWithObjectsAndKeys:            [NSNumber numberWithDouble: -0.01], kCIAttributeSliderMin,\r\n            [NSNumber numberWithDouble:  0.01], kCIAttributeSliderMax,\r\n            [NSNumber numberWithDouble:  0.00], kCIAttributeDefault,\r\n            [NSNumber numberWithDouble:  0.00], kCIAttributeIdentity,\r\n            kCIAttributeTypeScalar,             kCIAttributeType,\r\n            nil];\r\n<\/code><\/pre>\n
\u2193<\/p>\n
NSDictionary *slopeDict = @{\r\n        kCIAttributeSliderMin : @-0.01,\r\n        kCIAttributeSliderMax : @0.01,\r\n        kCIAttributeDefault   : @0.00,\r\n        kCIAttributeIdentity  : @0.00,\r\n        kCIAttributeType      : kCIAttributeTypeScalar };\r\n<\/code><\/pre>\n
\n
id firstElement = [anArray objectAtIndex:0];\r\n[anArray replaceObjectAtIndex:0 withObject:newValue];\r\n<\/code><\/pre>\n
\u2193<\/p>\n
id firstElement = anArray[0];\r\nanArray[0] = newValue;\r\n<\/code><\/pre>\n
\n
id value = [aDictionary objectForKey:@\"key\"];\r\n[aDictionary setObject:newValue forKey:@\"key\"];\r\n<\/code><\/pre>\n
\u2193<\/p>\n
id value = aDictionary[@\"key\"];\r\naDictionary[@\"key\"] = newValue;\r\n<\/code><\/pre>\n
\n
NSArray *array = ...;\r\nint i;\r\nfor (i = 0; i < [array count]; i++) {\r\n    id element = [array objectAtIndex:i];\r\n    \/\/ ... \r\n}\r\n<\/code><\/pre>\n
\u2193<\/p>\n
NSArray *array = ...;\r\nfor (id element in array) {\r\n     \/\/ ...\r\n}\r\n<\/code><\/pre>\n
Blocks<\/h2>\n
NSArray<\/h3>\n
\uc815\ub82c\uc740 (NSArray *)sortedArrayUsingComparator:(NSComparator)cmptr<\/code>\ub97c \uc0ac\uc6a9\ud560 \uc218 \uc788\ub2e4.<\/p>\n
NSArray *array = ...;\r\nNSArray *sortedArray;\r\nsortedArray = [array sortedArrayUsingFunction:MySort context:NULL];\r\n\r\nNSInteger MySort(id num1, id num2, void *context) {\r\n    NSComparisonResult result;\r\n    \/\/ Do comparison\r\n    return result;\r\n}\r\n<\/code><\/pre>\n
\u2193<\/p>\n
NSArray *array = ...;\r\nBOOL reverse = ...;\r\nNSArray *sortedArray;\r\nsortedArray = [array sortedArrayUsingComparator:^(id num1, id num2) {\r\n    NSComparisonResult result;\r\n    \/\/ Do comparison\r\n    return result;\r\n}];\r\n<\/code><\/pre>\n
<\/h2>\n
each\ub294 (void)enumerateObjectsUsingBlock:(void (^)(id obj, NSUInteger idx, BOOL *stop))block<\/code>\uc744 \uc0ac\uc6a9\ud560 \uc218 \uc788\ub2e4.<\/p>\n
NSArray *array = ...;\r\nfor (id element in array) {\r\n    \/\/ ... \r\n}\r\n<\/code><\/pre>\n
\u2193<\/p>\n
NSArray *array = ...;\r\n[array enumerateObjectsUsingBlock:\r\n      ^(id obj, NSUInteger idx, BOOL *stop) {\r\n      \/\/ ...\r\n      NSLog(@\"Processing %@ at index %d\u201d, obj, idx);\r\n      \/\/ ...\r\n}];\r\n<\/code><\/pre>\n
<\/h2>\n
NSDictionary<\/h3>\n
(void)enumerateKeysAndObjectsUsingBlock:(void (^)(id key, id obj, BOOL *stop))block<\/code>\uc744 \uc0ac\uc6a9\ud560 \uc218 \uc788\ub2e4.<\/p>\n
NSDictionary *dictionary = ...;\r\nfor (NSString *key in dictionary) {\r\n    id object = [dictionary objectForKey:key];\r\n    \/\/ Do things with key and object.\r\n}\r\n<\/code><\/pre>\n
\u2193<\/p>\n
NSDictionary *dictionary = ...;\r\n[dictionary enumerateKeysAndObjectsUsingBlock:^(id key, id object, BOOL *stop) {\r\n    \/\/ Do things with key and object.\r\n}];\r\n<\/code><\/pre>\n
<\/h2>\n
Notifications<\/h3>\n
(id)addObserverForName:(NSString *)name object:(id)obj queue:(NSOperationQueue *)queue usingBlock:(void (^)(NSNotification *note))block<\/code>\uc744 \uc0ac\uc6a9\ud560 \uc218 \uc788\ub2e4.<\/p>\n
- (void)registerForNotifications {\r\n    NSNotificationCenter *center = ...\r\n    [center addObserver:self\r\n        selector:@selector(windowBecameKey:)\r\n        name:NSWindowDidBecomeKeyNotification\r\n        object:self.window];\r\n}\r\n\/\/ Different context\r\n\/\/ No queue information\r\n- (void)windowBecameKey:(NSNotification *)notification {\r\n    \/\/ Get contextual information.\r\n}\r\n<\/code><\/pre>\n
\u2193<\/p>\n
- (void)registerForNotifications {\r\n    NSNotificationCenter *center = ...\r\n    MyClass *__weak weakSelf = self;\r\n    [center addObserverForName:NSWindowDidBecomeKeyNotification\r\n        object:self.window\r\n        queue:[NSOperationQueue mainQueue]\r\n        usingBlock:^(NSNotification *) {\r\n            \/\/ ...\r\n            [weakSelf doSomething];\r\n            \/\/ ...\r\n    }];\r\n}\r\n<\/code><\/pre>\n
Blosks\ub0b4\uc5d0\uc11c self\ub294 \uc9c1\uc811 \ucc38\uc870 \ub418\uc9c0 \uc54a\uace0 \uc57d\ud55c\ucc38\uc870 MyClass *__weak<\/code>\uc73c\ub85c \ubcc0\ud658\ud574\uc11c \uc0ac\uc6a9\ud574\uc57c \ud55c\ub2e4.<\/p>\n
<\/h2>\n
\uae30\ud0c0<\/h2>\n