关于OC对象拷贝的问题

先来打一下实例：

创建一个Person类：

Person.h:

#import <Foundation/Foundation.h>  @interface Person : NSObject<NSCopying>  @property(nonatomic,assign) int age; @property(nonatomic,retain) NSString *name;  @end 

#import "Person.h"  @implementation Person  - (id)init {     self = [super init];     if (self) {         self.name = @"xiaoming";         self.age = 22;     }     return self; } //构造拷贝函数,虽然说内存管理的原则是谁retain谁release，但是对copy来说比较特殊，是放在外面release的 -(id)copyWithZone:(NSZone *)zone {     Person *p = [[Person allocWithZone:zone] init];     p.name = self.name;  //浅拷贝，只是拷贝了地址     p.age = self.age;             //深拷贝     //p.name = [self.name copy];//内容拷贝一份     return p; }  - (void)dealloc {     [_name release];     [super dealloc]; }  @end

#import <Foundation/Foundation.h> #import "Person.h" int main(int argc, const char * argv[]) {      @autoreleasepool {                  Person *p = [[Person alloc] init];         p.age = 11;         NSMutableString *str = [NSMutableString stringWithFormat:@"xiaohua"];         p.name = str;         NSLog(@"person age = %d name = %@",p.age,p.name);                  Person *p1 = [p copy];         [str appendString:@"1"]; //在原来的基础上加1         NSLog(@"person age = %d name = %@",p.age,p.name); //验证原来的对象是否改变         NSLog(@"p1 age = %d name = %@",p1.age,p1.name);  //打印当然的拷贝对象，这个要看前面的拷贝实现的函数是深拷贝还是浅拷贝                  [p1 release];         [p release];     }     return 0; }

2013-08-05 11:35:39.688 对象拷贝[862:303] person age = 11 name = xiaohua

2013-08-05 11:35:39.690 对象拷贝[862:303] person age = 11 name = xiaohua1

2013-08-05 11:35:39.691 对象拷贝[862:303] p1 age = 11 name = xiaohua1

2013-08-05 11:39:26.579 对象拷贝[892:303] person age = 11 name = xiaohua

2013-08-05 11:39:26.581 对象拷贝[892:303] person age = 11 name = xiaohua1

2013-08-05 11:39:26.582 对象拷贝[892:303] p1 age = 11 name = xiaohua

本文转自蓬莱仙羽51CTO博客，原文链接：http://blog.51cto.com/dingxiaowei/1366465，如需转载请自行联系原作者