如何在Objective-C中转换对象

#import<Foundation/Foundation.h>

@interface Person : NSObject <NSCoding>

@property (nonatomic, strong) NSString *name;
@property (nonatomic, assign) NSInteger age;

@end

@implementation Person

- (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

int main(int argc, const char * argv[]) {
    @autoreleasepool {
        Person *person = [[Person alloc] init];
        person.name = @"John";
        person.age = 30;

        // 序列化对象
        NSData *data = [NSKeyedArchiver archivedDataWithRootObject:person];

        // 反序列化对象
        Person *unarchivedPerson = [NSKeyedUnarchiver unarchiveObjectWithData:data];

        NSLog(@"Name: %@, Age: %ld", unarchivedPerson.name, (long)unarchivedPerson.age);
    }
    return 0;
}