NSKeyedArchiver

Foundation 프레임워크의 객체 아카이빙

NSArray *arr = [NSArray arrayWithObjects:@”a”,@”b”,nil];
[NSKeyedArchiver archiveRootObject:arr toFile:path];

NSArray *arr = [NSKeyedUnarchiver unarchiveObjectWithFile:path];

사용자 정의 객체 아카이빙

// 
- (void)encodeWithCoder:(NSCoder *)encoder {
    // 
    [super encodeWithCode:encode];
    [encoder encodeObject:self.name forKey:@"name"];
    [encoder encodeInt:self.age forKey:@"age"];
    [encoder encodeFloat:self.height forKey:@"height"];
}
// 
- (id)initWithCoder:(NSCoder *)decoder {
    // 
    self = [super initWithCoder:decoder];
    self.name = [decoder decodeObjectForKey:@"name"];
    self.age = [decoder decodeIntForKey:@"age"];
    self.height = [decoder decodeFloatForKey:@"height"];
    return self;
}

// ( )
Person *person = [[Person alloc] init];
person.name = @"rh";
person.age = 100;
person.height = 1.83f;
[NSKeyedArchiver archiveRootObject:person toFile:path];

// ( )
Person *person = [NSKeyedUnarchiver unarchiveObjectWithFile:path];

NSData와 함께 여러 사용자 지정 객체 아카이빙

// （ ）
//  
NSMutableData *data = [NSMutableData data];
//  NSKeyedArchiver 
NSKeyedArchiver *archiver = [[NSKeyedArchiver alloc] initForWritingWithMutableData:data];
//  ， NSMutableData 
[archiver encodeObject:person1 forKey:@"person1"];
[archiver encodeObject:person2 forKey:@"person2"];
//  ( )
[archiver finishEncoding];
//  
[data writeToFile:path atomically:YES];

// （ ）
//  
NSData *data = [NSData dataWithContentsOfFile:path];
//  ， NSKeyedUnarchiver 
NSKeyedUnarchiver *unarchiver = [[NSKeyedUnarchiver alloc] initForReadingWithData:data];
Person *person1 = [unarchiver decodeObjectForKey:@"person1"];
Person *person2 = [unarchiver decodeObjectForKey:@"person2"];
//  
[unarchiver finishDecoding];