Archive(归档/反归档)

#import "ViewController.h"
#import "Person.h"
@interface ViewController ()

@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    Person *p1 = [Person new];
    p1.name = @"Jackie Chan";
    p1.age = 16;
    //将复杂对象转为NSData,归档(序列化)
    NSData *p1Data = [NSKeyedArchiver archivedDataWithRootObject:p1];
    
    //创建路径,存储p1Data
    NSString *path = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES)[0] stringByAppendingPathComponent:@"person"];
    NSLog(@"%@",path);
    [p1Data writeToFile:path atomically:YES];

    //读取文件中的数据
    NSData *p2Data = [NSData dataWithContentsOfFile:path];
    Person *p2 = [NSKeyedUnarchiver unarchiveObjectWithData:p2Data];
    
    NSLog(@"%@,%ld",p2.name,p2.age);
    p2.name = @"Bruce Lee";
    p2.age = 18;

    //使用归档工具进行归档
    NSMutableData *mdata = [[NSMutableData alloc] init];
    NSKeyedArchiver *archiver = [[NSKeyedArchiver alloc] initForWritingWithMutableData:mdata];
    //进行归档
    [archiver encodeObject:p1 forKey:@"person1"];
    [archiver encodeObject:p2 forKey:@"person2"];
    //结束归档
    [archiver finishEncoding];
    NSLog(@"%@",mdata);
    //反归档
    //反归档工具
    NSKeyedUnarchiver *unarchiver = [[NSKeyedUnarchiver alloc] initForReadingWithData:mdata];
    //进行反归档
    Person *p3 =  [unarchiver decodeObjectForKey:@"person1"];
    Person *p4 = [unarchiver decodeObjectForKey:@"person2"];
    NSLog(@"%@ %ld",p3.name,p3.age);
    NSLog(@"%@ %ld",p4.name,p4.age);
    //结束反归档
    [unarchiver finishDecoding];
}

#import <Foundation/Foundation.h>

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

#import "Person.h"

@implementation Person
//归档(序列化) 协议方法,将属性转为二进制数据
- (void)encodeWithCoder:(NSCoder *)aCoder
{
    [aCoder encodeObject:self.name forKey:@"name"];
    [aCoder encodeInteger:self.age forKey:@"age"];
}
//反归档(反序列化)方法,将二进制数据恢复为属性
- (nullable instancetype)initWithCoder:(NSCoder *)aDecoder
{
    self = [super init];
    if (self) {
        self.name = [aDecoder decodeObjectForKey:@"name"];
        self.age = [aDecoder decodeIntegerForKey:@"age"];
        
    }
    return self;
}
@end