#import <Foundation/Foundation.h>

 @interface model : NSObject

@property(nonatomic,copy)NSString *bookName;

@property(nonatomic,assign)double BookPrice;

@end

//实现委托

@interface model()<NSCoding>

@end

@implementation model

//归档

- (void)encodeWithCoder:(NSCoder *)aCoder{

    [aCoder encodeObject:self.bookName forKey:@"BookName"];

    [aCoder encodeDouble:self.BookPrice forKey:@"BookPrice"];

  }

//解档

- (id)initWithCoder:(NSCoder *)aDecoder{

    self=[super init];

    if (self) {

        self.bookName= [aDecoder decodeObjectForKey:@"BookName"];

        self.BookPrice= [aDecoder decodeDoubleForKey:@"BookPrice"];

    }

    return  self;

}

要使用的内中

  //归档(OC对象->NSData)

    NSMutableData *data = http://www.mamicode.com/[NSMutableData data];

    NSKeyedArchiver *archiver = [[NSKeyedArchiver alloc] initForWritingWithMutableData:data];

    //模型数据

    model *mo=[[model alloc]init];

    mo.bookName=@"APP";

    mo.BookPrice=18.5;

    [archiver encodeObject:mo forKey:@"mo"];

    [archiver finishEncoding];

    //Document路径

    NSString *paths = [[NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES)objectAtIndex:0]stringByAppendingString:@"model.txt"];

    if ([data writeToFile:paths atomically:NO]) {

        NSLog(@"写入成功");

    }

    else{

        NSLog(@"写入失败");

    }

}

- (void)jied{

    NSString *paths = [[NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES)objectAtIndex:0]stringByAppendingString:@"model.txt"];

    //解档

    NSMutableData *data = http://www.mamicode.com/[NSMutableData dataWithContentsOfFile:paths];

    NSKeyedUnarchiver *unarchiver = [[NSKeyedUnarchiver alloc] initForReadingWithData:data];

    model *mo = [unarchiver decodeObjectForKey:@"mo"];

    //完成解档

    [unarchiver finishDecoding];

简单的归档、接档