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首先创建一个归档用的工具类

BaseKeyedArchiver

.h中代码：

//
//  BaseKeyedArchiver.h
//  DataWriteToFile
//
//  Created by limin on 16/7/18.
//  Copyright © 2016年 君安信（北京）科技有限公司. All rights reserved.
//

#import <Foundation/Foundation.h>

@interface BaseKeyedArchiver : NSObject
/**
 *  单例
 *
 *  @return 返回单例对象
 */
+ (instancetype)sharedClient;

/**
 *  对数据进行归档
 *
 *  @param dataArray 需要进行归档的数据
 */
-(void)setArchiverDataWithData:(NSMutableArray *)dataArray;

/**
 *  获取解归档的数据
 *
 *  @return 解归档后的数组
 */
-(NSMutableArray*)getArchiverData;

/**
 *  获取文件路径
 *
 *  @return 返回文件路径
 */
-(NSString *)getAllFilePath;
@end

.m中代码

//
//  BaseKeyedArchiver.m
//  DataWriteToFile
//
//  Created by limin on 16/7/18.
//  Copyright © 2016年 君安信（北京）科技有限公司. All rights reserved.
//

#import "BaseKeyedArchiver.h"
/**
 *  文件后缀名
 */
NSString *const kFileDefaultPathExtension = @"cache";
/**
 *  默认文件名
 */
NSString *kFileDefaultFileName = @"defaultFile";
@interface BaseKeyedArchiver ()

@end
@implementation BaseKeyedArchiver

/**
 *  单例
 *
 *  @return 返回单例对象
 */
+ (instancetype)sharedClient
{
    static BaseKeyedArchiver *client = nil;
    static dispatch_once_t onceToken;
    dispatch_once(&onceToken, ^{
        client = [[BaseKeyedArchiver alloc]init];
    });
//    kFileDefaultFileName = [[NSUserDefaults standardUserDefaults]valueForKey:isLoginStatus]?[[NSUserDefaults standardUserDefaults]valueForKey:PHONE]:@"defaultFile";
    return client;
}

/**
 *  对数据进行归档
 *
 *  @param dataArray 需要进行归档的数据
 */
-(void)setArchiverDataWithData:(NSMutableArray *)dataArray
{
    NSString *fileAllPath = [self getAllFilePath];
    if([[NSFileManager defaultManager] fileExistsAtPath:fileAllPath]) {//先将该地址存在的文件删除，再存储。
        NSError *error    = nil;
        if(![[NSFileManager defaultManager] removeItemAtPath:fileAllPath error:&error]) {
            NSLog(@"Cannot remove file: %@", error);
        }
    }
    [NSKeyedArchiver archiveRootObject:dataArray toFile:fileAllPath];
}

/**
 *  获取解归档的数据
 *
 *  @return 解归档后的数组
 */
-(NSMutableArray*)getArchiverData
{
    NSString *fileAllPath = [self getAllFilePath];
    NSMutableArray *newDataArray = [NSKeyedUnarchiver unarchiveObjectWithFile:fileAllPath];
    return newDataArray;
}


/**
 *  获取文件路径
 *
 *  @return 返回文件路径
 */
-(NSString *)getAllFilePath
{
    NSString *paths = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) firstObject];
    NSString *fileAllPath = [[paths stringByAppendingPathComponent:kFileDefaultFileName] stringByAppendingPathExtension:kFileDefaultPathExtension];
    return fileAllPath;
}

@end

需要存储的数据，创建一个model对象。并在model.m中加入归档信息

.h代码

//
//  LMDraftModel.h
//  ImageSelectOrArchive
//
//  Created by limin on 16/12/13.
//  Copyright © 2016年 君安信（北京）科技有限公司. All rights reserved.
//

#import <Foundation/Foundation.h>

@interface LMDraftModel : NSObject
/* 文章标题 */
@property(nonatomic,copy)NSString *articleTitle;
/* 时间 */
@property(nonatomic,copy)NSString *time;
/* 图片数组 */
@property(nonatomic,strong)NSArray *pictureArrays;
/** 图片资源*/
@property(nonatomic,strong)NSArray *assetArrays;
/* 图片来源 */
@property(nonatomic,assign)BOOL OriginalPhoto;
@end

.m代码

//
//  LMDraftModel.m
//  ImageSelectOrArchive
//
//  Created by limin on 16/12/13.
//  Copyright © 2016年 君安信（北京）科技有限公司. All rights reserved.
//

#import "LMDraftModel.h"
#import <objc/runtime.h>
@interface LMDraftModel()<NSCoding>
@end
@implementation LMDraftModel
#pragma mark - 归档
-(void)encodeWithCoder:(NSCoder *)aCoder
{
    unsigned int outCount = 0;
    Ivar *ivars = class_copyIvarList([self class], &outCount);
    for (unsigned int i = 0; i<outCount; i++) {
        Ivar ivar = ivars[i];
        NSString *key = [NSString stringWithUTF8String:ivar_getName(ivar)];
        id value = [self valueForKey:key];
        [aCoder encodeObject:value forKey:key];
    }
    free(ivars);
}
#pragma mark - 解归档
-(instancetype)initWithCoder:(NSCoder *)aDecoder
{
    self = [super init];
    if (self) {
        unsigned int OutCount = 0;
        Ivar *ivars = class_copyIvarList([self class], &OutCount);
        for (unsigned int i=0; i<OutCount; i++) {
            Ivar ivar = ivars[i];
            NSString *key = [NSString stringWithUTF8String:ivar_getName(ivar)];
            [self setValue:[aDecoder decodeObjectForKey:key] forKey:key];
        }
        free(ivars);
    }
    return self;
}
@end

数据归档方法：

#pragma mark - 保存到草稿箱
-(void)saveDraftBox
{
    //时间
    NSDateFormatter *dateFormatter = [[NSDateFormatter alloc]init];
    [dateFormatter setDateFormat:@"yyyy-MM-dd HH:mm:ss"];
    NSString *destDateString = [dateFormatter stringFromDate:[NSDate date]];
    //model
    LMDraftModel *model = [[LMDraftModel alloc]init];
    model.time = destDateString;
    model.articleTitle = self.titleTextField.text;
    model.pictureArrays = self.selectedPhotos;
   
    //归档数据{A:先取出存储的数据，B:判断数据是否已存在，（1，第一次进去，直接插入数据。2:从草稿箱进去的，直接替换对应的数据）}
    NSMutableArray *draftArrays = [[BaseKeyedArchiver sharedClient]getArchiverData];
    if (!draftArrays) {
        draftArrays = [NSMutableArray array];
    }
    if (self.isFromDraftBox) {
        [draftArrays replaceObjectAtIndex:self.draftIndex withObject:model];
    }else
    {
        [draftArrays insertObject:model atIndex:0];
    }
    [[BaseKeyedArchiver sharedClient]setArchiverDataWithData:draftArrays];
    
}

获取归档的数据:

-(void)getUnArchiveData
{
    //解析文件数据
    NSArray *array = [[BaseKeyedArchiver sharedClient]getArchiverData];
}