使用归档来创建对象的深复制

来源：互联网发布：电脑重装数据恢复编辑：程序博客网时间：2024/06/15 07:13

//使用Foundation的归档功能来创建对象的深复制

例如：Person类

Person.h

@interface Person : NSObject <NSCoding>
@property (nonatomic,copy)NSString *name;

@property (assign)int age;

- (id)initWithName:(NSString *)name withAge:(int)age;

Person.m

- (id)initWithName:(NSString *)name withAge:(int)age{

      if(self = [super init])
      {
          self.name = name;

          self.age = age;
      }


    return self;

}

- (void)encodeWithCoder:(NSCoder *)aCoder{        //NSCoding协议必须实现的方法

    [aCoder encodeObject:self.name forKey:@"name"];
    [aCoder encodeInt:self.age forKey:@"age"];


}

- (id)initWithCoder:(NSCoder *)aDecoder{       //NSCoding协议必须实现的方法

    if(self = [super init])
    {
        self.name = [aDecoder decodeObjectForKey:@"name"];
        self.age = [aDecoder decodeIntForKey:@"age"];
    }

    return self;

}

main函数

int main(int argc, const char * argv[])
{

    @autoreleasepool {

        NSMutableArray *mArray = [NSMutableArray array];

        NSMutableString *str1 = [NSMutableString stringWithString:@"one"];
        NSMutableString *str2 = [NSMutableString stringWithString:@"two"];
        NSMutableString *str3 = [NSMutableString stringWithString:@"three"];
        Person *person = [[Person alloc]initWithName:@"yangcw" withAge:22];


        [mArray addObject:str1];
        [mArray addObject:str2];
        [mArray addObject:str3];
        [mArray addObject:person];

       //自定义类需要使用NSKeyedArchiver

        NSData *data = [NSKeyedArchiver archivedDataWithRootObject:mArray];

        NSArray *dataArray = [NSKeyedUnarchiver unarchiveObjectWithData:data];


        [str1 appendString:@"ONE"];


        NSLog(@"mArray = %@ 地址=%p",mArray,mArray);


        NSLog(@"array = %@ 地址=%p",dataArray,dataArray);

        //结果显示person地址和数组地址都不一样

    }
    return 0;
}

//输出

2014-08-02 09:13:08.551 ycw_0801_2[433:303] mArray = (
    oneONE,
    two,
    three,
    "<Person: 0x10010bde0>"
) 地址=0x10010bd30
2014-08-02 09:13:08.553 ycw_0801_2[433:303] array = (
    one,
    two,
    three,
    "<Person: 0x10010a520>"
) 地址=0x10010f9b0

0 0