在Objective C中序列化对象

@interface MyObject : NSObject <NSCoding>
@property (nonatomic, strong) NSString *name;
@property (nonatomic, assign) NSInteger age;
@end

@implementation MyObject
- (void)encodeWithCoder:(NSCoder *)aCoder {
    [aCoder encodeObject:self.name forKey:@"name"];
    [aCoder encodeInteger:self.age forKey:@"age"];
}

- (instancetype)initWithCoder:(NSCoder *)aDecoder {
    self = [super init];
    if (self) {
        self.name = [aDecoder decodeObjectForKey:@"name"];
        self.age = [aDecoder decodeIntegerForKey:@"age"];
    }
    return self;
}
@end

MyObject *myObject = [[MyObject alloc] init];
myObject.name = @"John";
myObject.age = 30;

NSData *data = [NSKeyedArchiver archivedDataWithRootObject:myObject];

NSData *data = ...; // 从磁盘或网络中获取数据
MyObject *myObject = [NSKeyedUnarchiver unarchiveObjectWithData:data];