iOS 归档和解档demo

///////////////////////让model遵守 协议

#define kactivityNum         @"activityNum"

#define kalsoNeedKll         @"alsoNeedKll"

@interface UserModel () <</span>NSCoding>

@end

添加代理的方法并且实现

- (id)initWithCoder:(NSCoder *)aDecoder

{

    if (self == [super init]) {

        self.activityNum = [aDecoder decodeObjectForKey:kactivityNum];

        self.alsoNeedKll = [aDecoder decodeObjectForKey:kalsoNeedKll];

        。。。。。。。。。。。

    }

    return self;

}

- (void)encodeWithCoder:(NSCoder *)aCoder

{

    [aCoder encodeObject:self.activityNum forKey:kactivityNum];

    [aCoder encodeObject:self.alsoNeedKll forKey:kalsoNeedKll];

   。。。。。。。。。。。

}

///////////////////////归档

//需要用NSMutableData来中中介

    NSMutableData *data = [[NSMutableData alloc] init];

    //创建归档辅助类

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

    //编码

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

    //结束编码

    [archiver finishEncoding];

    //写入

    [data writeToFile:[self getFilePathWithModelKey:@"model"] atomically:YES];

    

    ///////////////////////解档

    NSData *_data = [[NSData alloc] initWithContentsOfFile:[selfgetFilePathWithModelKey:@"model"]];

//解档辅助类

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

    //解档出数据模型Student

//解码并解档出model

    UserModel *mStudent = [unarchiver decodeObjectForKey:@"user"];

//关闭解档

    [unarchiver finishDecoding];

//得到Document目录

-(NSString *) getFilePathWithModelKey:(NSString *)modelkey

{

   

    NSArray *array =  NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,NSUserDomainMask, YES);

    

    return [[array objectAtIndex:0] stringByAppendingPathComponent:modelkey];

    

 

}