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 0;
}

 

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 0;
}