归档和深拷贝

  //将array归档到path路径中

 NSString *path = [@"a.plist" documentsAppend];

［NSKeyedArchiver archiveRootObject:array toFile:path］;

  //读取path路径中文件

［NSKeyedUnarchiver unarchiveObjectWithFile:path］;

 

#pragma mark 写入多个Person的方法
- (void)writePersons2 {
    Person *p1 = [Person personWithName:@"person" age:10];
    Person *p2 = [Person personWithName:@"name" age:11];
    
    NSMutableData *data = [NSMutableData data];
    
    // archiver负责将p1、p2塞进data中
    NSKeyedArchiver *archiver = [[[NSKeyedArchiver alloc] initForWritingWithMutableData:data] autorelease];
    
    [archiver encodeObject:person1 forKey:@"p1"];
    
    [archiver encodeObject:person2 forKey:@"p2"];
    
    // 编码结束
    [archiver finishEncoding];
    
    NSString *path = [@"persons2.plist" documentsAppend];
    // 将data写入某个文件中
    [data writeToFile:path atomically:YES];
 }

 

#pragma mark 读取多个Person的方法
- (void)readPersons2 {
    NSString *path = [@"persons2.plist" documentsAppend];
    
    NSData *data = [NSData dataWithContentsOfFile:path];
    
    NSKeyedUnarchiver *unarchiver = [[[NSKeyedUnarchiver alloc] initForReadingWithData:data] autorelease];
    
    Person *p = [unarchiver decodeObjectForKey:@"person1"];
    NSLog(@"%@", p);
 }

 

#pragma mark 用归档技术实现深拷贝1
// 缺点就是会产生临时文件
- (void)copyPerson1 {
    Person *p1 = [Person personWithName:@"person" age:10];
    
    NSString *path = [@"p1.plist" tmpAppend];
    // 将对象p1归档到p1.plist文件中
    [NSKeyedArchiver archiveRootObject:p1 toFile:path];
    
    Person *p2 = [NSKeyedUnarchiver unarchiveObjectWithFile:path];
    
    NSLog(@"p1-地址%x-%@", p1, p1);
    NSLog(@"p2-地址%x-%@", p2, p2);
 }

 

#pragma mark 用归档技术实现深拷贝2
- (void)copyPerson2 {
    Person *p1 = [Person personWithName:@"person" age:10];
    
    // 将对象p1归档成一个NSData对象
    NSData *data = [NSKeyedArchiver archivedDataWithRootObject:p1];
    
    Person *p2 = [NSKeyedUnarchiver unarchiveObjectWithData:data];
    
    NSLog(@"p1-地址%x-%@", p1, p1);
    NSLog(@"p2-地址%x-%@", p2, p2);
 }