在之前一片文章我们介绍了OC中的内存管理:http://blog.csdn.net/jiangwei0910410003/article/details/41924683,今天我们来介绍两个关键字的使用:@property和@synthesize

一、@property关键字

这个关键字是OC中能够快速的定义一个属性的方式,而且他可以设置一些值,就可以达到一定的效果,比如引用计数的问题

下面来看一下他的使用方法:

//
// Person.h
// 25_Property
//
// Created by jiangwei on 14-10-12.
// Copyright (c) 2014年 jiangwei. All rights reserved.
// #import <Foundation/Foundation.h> @interface User : NSObject{
//NSString *_userName;
//NSString *_passWord;
//...
} //第一步生成_userName属性
//第二步为_userName属性自动生成set/get方法 //property在生成的set方法中,有没有做引用的操作?
//set方法的三种方式:
//第一种方式:
//普通赋值
//一般对象类型的引用操作
//NSString对象类型的引用操作 //第一个位置
//atomic:线程保护的,默认
//nonatomic:线程不保护的 //第二个位置
//assign:直接赋值,默认
//retain:保留对象
//copy:拷贝对象 //第三个位置
//readwrite:生成get/set方法,默认
//readonly:只生成get方法
@property NSString *userName;

@end

还记得我们之前定义属性的时候,在{...}中进行定义,而且定义完之后还有可能需要实现get/set方法,这里我们直接使用@property关键字进行定义:

@property NSString *userName;

这样定义完之后,我们就可以使用这个属性了:

这样定义的方式之后,这个属性就会自动有set/get方法了

第一步生成_userName属性

第二步为_userName属性自动生成set/get方法

这样定义是不是比以前方便多了

下面再来看一下他还有三个值可以设置:

@property(atomic,retain,readwrite) Dog *dog;

1、第一个位置的值:

atomic:线程保护的,默认

nonatomic:线程不保护的

2、第二个位置的值:

assign:直接赋值,默认

retain:保留对象,内部会自动调用retain方法,引用计数+1

copy:拷贝对象

3、第三个位置的值:

readwrite:生成get/set方法,默认

readonly:只生成get方法

这里来做一个例子:

main.m

//
// main.m
// 25_Property
//
// Created by jiangwei on 14-10-12.
// Copyright (c) 2014年 jiangwei. All rights reserved.
// #import <Foundation/Foundation.h> #import "User.h"
#import "Dog.h" //当一个类中有很多个属性的时候,那么我们需要手动的编写他们的set/get方法
//这样就比较费时,所以这时候就可以使用@property
int main(int argc, const char * argv[]) { User *user = [[User alloc] init];
Dog *dog = [[Dog alloc] init];
NSLog(@"count:%ld",[dog retainCount]); [user setDog:dog]; NSLog(@"count:%ld",[dog retainCount]); return 0;
}

运行结果:

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" alt="" />

二、@synthesize关键字

//
// Person.m
// 25_Property
//
// Created by jiangwei on 14-10-12.
// Copyright (c) 2014年 jiangwei. All rights reserved.
// #import <Foundation/Foundation.h>
#import "User.h" //有时候我们不想定义属性为_开头的
//这时候我们就可以使用@synthesize,来修改我们想要的属性名 //这时候属性_userName变成了$userName @implementation User
@synthesize userName = $userName; @end

因为我们使用@property定义属性之后,如果我们想修改这个属性的名称,就可以使用@synthesize关键字来对属性名称进行修改

@synthesize userName = $userName;

总结

这一篇主要介绍了两个关键字的使用,@property和@synthesize,特别是@property关键字,后面定义属性的时候几乎就是用它了,非常方便

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