iOS 利用归档解档实现类似微博及一些CRM类软件的草稿箱思路

实际上就是写一个model类 然后将要存数据放到model中，然后将model添加到数组，然后对数组及数组中放的model归档，本地存储起来，解档，拿到数据在需要的地方显示出来

因为model是一个自己写的类 方便起见 归档解档encodeWithCoder和initWithCoder:方法中用了runtime获取属性

下面是核心代码（由于刚开始只是存当前登录用户的数据所以存的是一个数组，后来想到切换用户，然后将数组按登录用户的userid存到字典中然后再存储的，所以代码中有些字典标识符写得不够准确名称中含有array）

model 的相关代码

//
//  LMDraftModel.h
//  TestArchiver
//
//  Created by 闵哲 on 2017/6/13.
//  Copyright © 2017年 Gunmm. All rights reserved.
//

#import <Foundation/Foundation.h>

@interface GunmmDraftModel : NSObject

/* 数据 */
@property (nonatomic, strong) NSDictionary *dataDic;
/* 时间 */
@property(nonatomic,copy)NSString *time;
/* 类型 */
@property(nonatomic,copy)NSString *entityName;


@end

//
//  LMDraftModel.m
//  TestArchiver
//
//  Created by 闵哲 on 2017/6/13.
//  Copyright © 2017年 Gunmm. All rights reserved.
//

#import "GunmmDraftModel.h"
#import <objc/runtime.h>
@interface GunmmDraftModel()<NSCoding>
@end
@implementation GunmmDraftModel

-(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);
}


-(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

存储的管理类的相关代码

//
//  KeyArchiverManager.h
//  TestArchiver
//
//  Created by 闵哲 on 2017/6/13.
//  Copyright © 2017年 Gunmm. All rights reserved.
//

#import <Foundation/Foundation.h>

@interface KeyArchiverManager : 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:(NSMutableDictionary *)dataDic;

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

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

@end

//
//  KeyArchiverManager.m
//  TestArchiver
//
//  Created by 闵哲 on 2017/6/13.
//  Copyright © 2017年 Gunmm. All rights reserved.
//

#import "KeyArchiverManager.h"


/**
 *  文件后缀名
 */
NSString *const kFileDefaultPathExtension = @"cache";
/**
 *  默认文件名
 */
NSString *kFileDefaultFileName = @"draftFile";

@implementation KeyArchiverManager


/**
 *  单例
 *
 *  @return 返回单例对象
 */
+ (instancetype)sharedClient
{
    static KeyArchiverManager *client = nil;
    static dispatch_once_t onceToken;
    dispatch_once(&onceToken, ^{
        client = [[KeyArchiverManager alloc]init];
    });
    return client;
}

/**
 *  对数据进行归档
 *
 *  @param dataArray 需要进行归档的数据
 */
-(void)setArchiverDataWithData:(NSMutableDictionary *)dataDic
{
    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:dataDic toFile:fileAllPath];
}

/**
 *  获取解归档的数据
 *
 *  @return 解归档后的数组
 */
- (NSMutableDictionary *)getArchiverData
{
    NSString *fileAllPath = [self getAllFilePath];
    NSMutableDictionary *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

简单使用

存

-(void)saveDraftBox
{
    //model
    GunmmDraftModel *model = [[GunmmDraftModel alloc]init];
    model.dataDic = _draftDictionary;
    model.entityName = @"event";
    NSDateFormatter* formater = [[NSDateFormatter alloc] init];
    [formater setDateFormat:@"yyyy-MM-dd HH:mm:SS"];
    NSString *time = [formater stringFromDate:[[NSDate alloc]init]];
    model.time = time;
    
    
    NSMutableDictionary *draftDictionary = [[KeyArchiverManager sharedClient]getArchiverData];
    if (!draftDictionary) {
        draftDictionary = [NSMutableDictionary dictionary];
    }
    
    NSMutableArray *draftArrays = [[draftDictionary objectForKey:[WiseApplicationViewController getUserId]]mutableCopy];
    if (!draftArrays) {
        draftArrays = [NSMutableArray array];
    }
    
    if ([_pageType isEqualToString:@"draftPage"]) {
        [draftArrays replaceObjectAtIndex:_indexOfKeyArchiver withObject:model];
    }else if ([_pageType isEqualToString:@"newPage"]){
        [draftArrays insertObject:model atIndex:0];
    }
    
    [draftDictionary setObject:draftArrays forKey:[WiseApplicationViewController getUserId]];
    [[KeyArchiverManager sharedClient]setArchiverDataWithData:draftDictionary];
    
}

查

 NSDictionary *dataDic = [[KeyArchiverManager sharedClient]getArchiverData];
    dataList = [dataDic objectForKey:[WiseApplicationViewController getUserId]];