nonatomic
– By default, access to the property is protected by guards that prevent multiple threads from interfering with each other. Normally this is not a problem, and one would specify nonatomic because it is faster.
-nonatomic will make no protection against multiple threads

retain/copy/assign
– retain increases the retain count and asserts ownership of the object
– copy creates a new variable with a new pointer and a retain count of 1
– assign just assigns, and it ithe default

readwrite/readonly
– readonly is used when only the getter will be declared
– the default is readwrite

// Person.h 헤더 파일
@interface Person : NSObject
{
     NSString * name;
     int age;
     BOOL enable;
     UIImage * image;
}
@property int age;
@property (nonatomic, copy) NSString * name;
@property (readonly, assign) BOOL enable;
@property (nonatomic, retain) UIImage * image;
//  위의 정의(declaration)는 아래의 getter/setter 정의를 생성해준다
// – (int) age;
// – (void) setAge: (int) newValue;
// – (NSString *) name;
// – (void) setName: (NSString *) newValue;
// – (BOOL) enable;
// – (UIImage *) image;
// – (void) setImage: (UIImage *) newValue;
@end

// Person.m 구현 파일
@implementation Person
@synthesize age;
@synthesize name;
@synthesize enable;
//  위의 코드는 아래의 getter/setter 코드를 생성해준다
// – (int) age {
//      return age;
// }
// – (void) setAge: (int) newValue {
//     age = newValue;
// }
// value 객체 (NSString, NSInteger와 같은)가 함수의 인자로 전달되거나
// 함수로부터 반환될 때, 객체자체보다는 일반적으로 복사본(copy)를 사용한다.
// – (NSString *) name {
//     return name;
// }
// – (void) setName: (NSString *) newValue {
//     if (name != newValue) {
//          [name release];
//          name = [newValue copy];
//     }
// }
// – (BOOL) enable {
//      return enable;
// }
// image 에 새로운 객체를 설정하면, 그 새로운 객체에 retain 을 한번 호출해 준다.
// 이는 외부에서 그 객체를 release 하더라도 객체가 메모리 해제되지 않도록
// 유지하기 위함이다.
// – (UIImage *) image {
//     return image;
// }
// – (void) setImage: (UIImage *) newValue {
//     if (image != newValue) {
//          [image release];
//          image = [newValue retain];
//     }
// }
-(id) init {
   // …. 중간생략
}
@end

http://developer.apple.com/library/IOS/#documentation/iPhone/Conceptual/iPhoneOSProgrammingGuide/ BuildTimeConfiguration/BuildTimeConfiguration.html#//apple_ref/doc/uid/TP40007072-CH7-SW7

Fundamental Design Patterns
http://developer.apple.com/library/mac/#documentation/General/Conceptual/
Mac101/Articles/02_DesignPatterns.html#//apple_ref/doc/uid/TP40010611-CH3-SW3

Use of the Model-View-Controller (MVC) design pattern ensures that the objects you create now can be reused or updated easily in future versions of your application. http://developer.apple.com/library/mac/#documentation/General/Conceptual/DevPedia-CocoaCore/MVC.html#//apple_ref/doc/uid/TP40008195-CH32

The delegation design pattern allows you to change the runtime behavior of an object without subclassing. Delegation is a pattern where one object sends messages to another object—specified as its delegate—to ask for input or to notify the it that an event is occurring.
http://developer.apple.com/library/mac/#documentation/General/Conceptual/DevPedia-CocoaCore/Delegation.html#//apple_ref/doc/uid/TP40008195-CH14

Controls use the target-action design pattern to notify your application of user interactions. Target-Action is a design pattern in which an object holds the information necessary to send a message to another object when an event occurs.
http://developer.apple.com/library/mac/#documentation/General/Conceptual/Devpedia-CocoaApp/TargetAction.html#//apple_ref/doc/uid/TP40009071-CH3

Other Design Patterns
http://developer.apple.com/library/mac/#documentation/General/Conceptual/
MOSXAppProgrammingGuide/CoreAppDesign/CoreAppDesign.html#//
apple_ref/doc/uid/TP40010543-CH3-SW1


http://developer.apple.com/library/mac/#documentation/Cocoa/Conceptual/
CocoaFundamentals/CocoaDesignPatterns/CocoaDesignPatterns.html#//
apple_ref/doc/uid/TP40002974-CH6-SW6

메모리 관리
http://developer.apple.com/library/mac/#DOCUMENTATION/Cocoa/
Conceptual/MemoryMgmt/Articles/MemoryMgmt.html

http://developer.apple.com/library/mac/#documentation/Cocoa/Reference/Foundation/
Protocols/NSObject_Protocol/Reference/NSObject.html

<Instance Variables>
  firstName
  lastName
  age

<Instance Methods>
  -init
  -initWithFirstName: lastName:
  -initWithFirstName: lastName: age:
  -dealloc
  -description
  -canLegallyVote
  -castBallot
  -isEqual
  -isEqualToPerson:

<Properties>
  age
  firstName
  lastName
  fullName

4770776431.zipYou can download the file here.

http://blog.outsider.ne.kr/604

http://iphonedevelopertips.com/cocoa/overriding-nsobject-description-method.html