OC MRC之 @property参数（代码分析）

第一部分

 //
 //  main.m
 //  04-@property参数
 //
 //  Created by apple on 13-8-9.
 //  Copyright (c) 2013年 itcast. All rights reserved.
 //
 #import <Foundation/Foundation.h>

 @interface Book : NSObject

 @end
 #import "Book.h"

 @implementation Book

 @end

 #import <Foundation/Foundation.h>
 #import "Book.h"

 @interface Person : NSObject
 @property int age;

 // retain : 生成的set方法里面，release旧值，retain新值
 @property (retain) Book *book;
 @property (retain) NSString *name;

 @end

 #import "Person.h"

 @implementation Person

 //- (void)setBook:(Book *)book
 //{
 //    if (_book != book)
 //    {
 //        [_book release];
 //
 //        _book = [book retain];
 //    }
 //}

 - (void)dealloc
 {
     [_book release];
     [_name release];
     [super dealloc];
 }

 @end

 #import <Foundation/Foundation.h>
 #import "Book.h"

 @interface Student : NSObject

 @property (retain) Book *book;

 @property (retain) NSString *name;

 @end

 #import "Student.h"

 @implementation Student

 - (void)dealloc
 {
     [_book release];
     [_name release];

     [super dealloc];
 }

 @end

 #import <Foundation/Foundation.h>
 #import "Person.h"
 #import "Book.h"

 int main()
 {
     Book *b = [[Book alloc] init];
     Person *p = [[Person alloc] init];

     p.book = b;

     NSLog(@"%ld", [b retainCount]);

     [p release];
     [b release];
     return ;
 }

第二部分

 //
 //  main.m
 //  05-@property参数
 //
 //  Created by apple on 13-8-9.
 //  Copyright (c) 2013年 itcast. All rights reserved.
 //

 #import <Foundation/Foundation.h>

 /*
  1.set方法内存管理相关的参数
  * retain : release旧值，retain新值（适用于OC对象类型）
  * assign : 直接赋值（默认，适用于非OC对象类型）
  * copy   : release旧值，copy新值

  2.是否要生成set方法
  * readwrite : 同时生成setter和getter的声明、实现(默认)
  * readonly  : 只会生成getter的声明、实现

  3.多线程管理
  * nonatomic : 性能高 (一般就用这个)
  * atomic    : 性能低（默认）

  4.setter和getter方法的名称
  * setter : 决定了set方法的名称，一定要有个冒号 :
  * getter : 决定了get方法的名称(一般用在BOOL类型)
  */

 @interface Person : NSObject

 // 返回BOOL类型的方法名一般以is开头
 @property (getter = isRich) BOOL rich;

 //
 @property (nonatomic, assign, readwrite) int weight;
 // setWeight:
 // weight

 //
 @property (readwrite, assign) int height;

 @property (nonatomic, assign) int age;

 @property (retain) NSString *name;
 @end

 #import "Person.h"

 @implementation Person

 @end

 #import <Foundation/Foundation.h>
 #import "Person.h"

 int main()
 {
     Person *p = [[Person alloc] init];

     p.rich = YES;

     BOOL b = p.isRich;

     return ;
 }