//简单对象可以通过直接写入文件的方式进行存储,复杂对象我们无法直接写入文件,这个时候需要借助归档和反归档

//归档和反归档并不是数据持久化的方式,而是将复杂对象转化成简单对象的一种方式

Person * per = [Person new];

per.name = @"欧阳冰";

per.gender = @"神秘";

per.hobby = @"美女";

per.age = @"21";

//准备一个路径

NSString * path = NSHomeDirectory();

path = [path stringByAppendingString:@"/曹江涛.avi"];

NSLog(@"%@",path);

//创建数据对象,用来存放person

NSMutableData * data = [NSMutableData data];

//创建归档对象

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

//归档

[archiver encodeObject:per forKey:@"secret"];

//完成归档

[archiver finishEncoding];

//写入文件(writeToFile)

[data writeToFile:path atomically:YES];

//反归档

NSData * _data = [NSData dataWithContentsOfFile:path];

//创建反归档对象

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

//反归档数据

Person * per1 = [unarchiver decodeObjectForKey:@"secret"];

//反归档完成

[unarchiver finishDecoding];

NSLog(@"%@",per1.name);

方法二：不用OC封装好的方法，序列化写入

将复杂对象序列化：

eg.将UserListsetNode *node,类型的对象写入文件。

#import 
       
        @interface UserListsetNode : NSObject 
        
         //序列化{@public    NSString* m_pstrInfo;//如果服务器异常这边就是错误信息    NSArray *m_pUsersArray;    NSMutableDictionary *m_pUserSetDic;    NSString *m_pstrTime;}+(NSData*)Request:(NSString*)pstrToken ToId:(NSString*)pstrToId;-(BOOL) DecodeJson:(NSData*)pData;@end

#import "UserListsetNode.h"@implementation UserListsetNode+(NSData*)Request:(NSString *)pstrToken ToId:(NSString*)pstrToId{    NSString *pstrUrl = [NSString stringWithFormat:@"%@%@",BASEURL,@"user/listset/"];    NSString *pstrData = [NSString stringWithFormat:@"{\"token\":\"%@\",\"toid\":\"%@\"}",pstrToken,pstrToId];    return [HttpUtil Request:pstrUrl data:pstrData];}-(BOOL)DecodeJson:(NSData *)pData{    m_pstrInfo = @"";        if (nil == pData)    {        return NO;    }        NSError *pError;    NSDictionary *pRetDic = [NSJSONSerialization JSONObjectWithData:pData  options:NSJSONReadingMutableContainers error:&pError];        if (nil == pRetDic)    {        return NO;    }        if ([[pRetDic objectForKey:@"status"] integerValue] == 0)    {        m_pstrInfo = [pRetDic objectForKey:@"info"];        return NO;    }else{        NSArray *pArray = [[NSArray alloc]init];        if(nil == m_pUserSetDic)        {            m_pUserSetDic = [[NSMutableDictionary alloc]init];        }        pArray = [pRetDic objectForKey:@"users"];        for (NSDictionary *pDic in pArray) {            for (int i =0; i

使用时：

-(void)SetUserSettings:(UserListsetNode *)pUserSet{    if ([CommonUtil FileExist:DIR_USERLISTSET]) {    //将序列化的对象写入文件        [NSKeyedArchiver archiveRootObject:pUserSet toFile:DIR_USERLISTSET];        [self GetUserSettings];            }else{        [[NSFileManager defaultManager]createFileAtPath:DIR_USERLISTSET contents:nil attributes:nil];        [self SetUserSettings:pUserSet];    }}