对象归档

#import <Foundation/Foundation.h>

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

#import "user.h"
@implementation user
-(void)encodeWithCoder:(NSCoder *)aCoder
{
    [aCoder encodeObject:self.name forKey:@"name"];
    [aCoder encodeObject:self.age forKey:@"age"];
}
-(id)initWithCoder:(NSCoder *)aDecoder
{
    self.name=[aDecoder decodeObjectForKey:@"name"];
    self.age=[aDecoder decodeObjectForKey:@"age"];
    return self;
}
@end

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

@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    user * use=[[user alloc]init];
    [email protected]"zefeng";
    [email protected]"11";
    //    对象归档需要实现这两给方法  归档调用-(void)encodeWithCoder:(NSCoder *)aCoder 解归档 -(id)initWithCoder:(NSCoder *)aDecoder

NSString * path =[NSHomeDirectory() stringByAppendingString:@"use.archiver"];
    NSMutableData * data =[NSMutableData data];
    NSKeyedArchiver * archive=[[NSKeyedArchiver alloc]initForWritingWithMutableData:data];//二进制存储
    [archive encodeObject:use forKey:@"user"];//归档参数
    [archive finishEncoding];//结束归档
    [data writeToFile:path atomically:YES];//写入路径文件
    
    //读取归档文件
    NSData * content =[NSData dataWithContentsOfFile:path];
    NSKeyedUnarchiver * unarchiver=[[NSKeyedUnarchiver alloc]initForReadingWithData:content];
    user* useData=[unarchiver decodeObjectForKey:@"user"];//根据key 找到对象
    
    NSLog(@"%@",useData.name);

}