用NSKeyedArchiver來深複製對象

‍‍        NSMutableString*s1=[NSMutableString stringWithString:@"a"];

        NSMutableString*s2=[NSMutableString stringWithString:@"b"];

        NSMutableString*s3=[NSMutableStringstringWithString:@"c"];

        NSMutableArray*array=[NSMutableArray arrayWithCapacity:5];

        [array addObject:s1];

        [array addObject:s2];

        [array addObject:s3];

        

        NSData*data=[NSKeyedArchiver archivedDataWithRootObject:array];

        NSMutableArray*array2=[NSKeyedUnarchiver          unarchiveObjectWithData:data];   

        NSLog(@"%@",array2);

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