1. #import <Foundation/Foundation.h>
   
2. #import "Person.h"
   
3. int main(int argc, const char * argv[]) {
   
4.     @autoreleasepool {
   
5.         //@property的参数copy的用法
   
6.         NSMutableString *str = [NSMutableString string];
   
7.         [str appendString:@"秦不来"];
   
8.         NSLog(@"str.add = %p,str.ratainCount = %lu",str,str.retainCount);
   
9.         Person *p = [Person new];
   
10.         p.name = str;
    
11.         NSLog(@"str.add = %p,str.ratainCount = %lu",str,str.retainCount);
    
12.         NSLog(@"p.name.add = %p,p.name.ratainCount = %lu",p.name,p.name.retainCount);
    
13.     }
    
14.     return 0;
    
15. }

复制代码

上面代码运行的结果：
2015-12-11 21:44:18.848 Copy和内存管理[742:20439] str.add = 0x100100760,str.ratainCount = 1
2015-12-11 21:44:18.849 Copy和内存管理[742:20439] str.add = 0x100100760,str.ratainCount = 1
2015-12-11 21:44:18.849 Copy和内存管理[742:20439] p.name.add = 0x100503430,p.name.ratainCount = 1
结果分析：copy过后，内存中重新分配了内存空间用来存储str 的副本，因此@property的参数copy实现的是深复制。

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