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给你的Model插上翅膀，自带归档、反归档功能，能够直接写入沙盒，或从沙盒中读取，打印你的Model可以直接看见内部属性。

打造BaseModel

实际开发中无论MVVM、MVC、还是MVP都有Model的存在，一个好的BaseModel可以精简代码，提高效率；来吧，集成本Model 愉快的使用MJExtension,JSONModel吧。

#import <Foundation/Foundation.h>

@interface BaseModel : NSObject <NSCoding>

@end

#import "BaseModel.h"
#import <objc/runtime.h> //导入Runtime 

@implementation BaseModel

#pragma mark - 解档方法
- (instancetype)initWithCoder:(NSCoder *)aDecoder
{
    self = [super init];
    if (self) {
        NSArray * porpertyArray = [self getAllPropertys];
        for (NSString *string in porpertyArray) {
            NSString *key = [string substringFromIndex:1];
            [self setValue:[aDecoder decodeObjectForKey:[NSString stringWithFormat:@"%@",key]] forKey:key];
        }
    }
    return self;
}
#pragma mark - 归档方法
- (void)encodeWithCoder:(NSCoder *)aCoder
{
    //获取所有属性
    NSArray * porpertyArray = [self getAllPropertys];
    for (NSString * name in porpertyArray) {
        //去掉属性名前面的_
        NSString * key = [name substringFromIndex:1];
        //约定好的键值对 c+key
        [aCoder encodeObject:[self valueForKey:key] forKey:[NSString stringWithFormat:@"%@",key]];
    }
}
#pragma mark - 获取model的所有属性
-(NSArray *)getAllPropertys{
    NSMutableArray * array = [[NSMutableArray alloc]init];
    unsigned int * count = malloc(sizeof(unsigned int));
    //调用runtime的方法
    //Ivar：方法返回的对象内容对象，这里将返回一个Ivar类型的指针
    //class_copyIvarList方法可以捕获到类的所有变量，将变量的数量存在一个unsigned int的指针中
    Ivar * mem = class_copyIvarList([self class], count);
    //进行遍历
    for (int i=0; i< *count ; i++) {
        //通过移动指针进行遍历
        Ivar var = * (mem+i);
        //获取变量的名称
        const char * name = ivar_getName(var);
        NSString * str = [NSString stringWithCString:name encoding:NSUTF8StringEncoding];
        [array addObject:str];
    }
    //释放内存
    free(count);
    //注意处理野指针
    count=nil;
    return array;
}
#pragma mark - description
- (NSString *)description
{
    NSString *keyValue = @"\n";
    NSArray * porpertyArray = [self getAllPropertys];
    for (NSString *string in porpertyArray) {
        NSString *key = [string substringFromIndex:1];
        NSString *value = [self valueForKey:key];
        keyValue = [keyValue stringByAppendingString:[NSString stringWithFormat:@"%@=%@\n",key,value]];
    }
    NSString *name =  NSStringFromClass([self class]);
    return [NSString stringWithFormat:@"\n<****\n%@: %@****>",name,keyValue];
}
@end

继承BaseModel

继承BaseModel ,你即将给你的Model插上翅膀

#import "BaseModel.h"

@interface HomeModel : BaseModel
@property (nonatomic,copy)NSString *name;
@property (nonatomic,copy)NSString *sex;
@property (nonatomic,assign)NSInteger age;
@end

#import "HomeModel.h"

@implementation HomeModel

@end

验证是否可以飞行

自定义对象写入沙盒 (复杂对象->归档->NSData->writeToFile)
（1）先归档 (遵循NSCoding协议，实现encodeWithCoder、initWithCoder方法)
（2）后写入

- (void)viewDidLoad {
    [super viewDidLoad];
    HomeModel *model = [[HomeModel alloc]init];
    model.name = @"iOSCoderZhao";
    model.sex = @"男";
    model.age = 18;
    // 写入沙盒
    [self archiverWithModel:model];
    // 沙盒读取
    [self enchiver];
}

- (void)archiverWithModel:(HomeModel *)model
{
    // 归档
    NSMutableData *data = [NSMutableData data];
    NSKeyedArchiver *archiver = [[NSKeyedArchiver alloc]initForWritingWithMutableData:data];
    [archiver encodeObject:model forKey:@"model"];
    [archiver finishEncoding];//结束归档
    
    // 存储路径(写入document路径)
    NSString *document = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) objectAtIndex:0];
    NSString *pathString = [document stringByAppendingPathComponent:@"dataPath"];
    [data writeToFile:pathString atomically:YES];
}

- (void)enchiver
{
    // 路径
    NSString *document = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) objectAtIndex:0];
    NSString *pathString = [document stringByAppendingPathComponent:@"dataPath"];
    NSData *data = [NSData dataWithContentsOfFile:pathString];
    // 解档
    NSKeyedUnarchiver *unArchiver = [[NSKeyedUnarchiver alloc]initForReadingWithData:data];
    HomeModel *model = [unArchiver decodeObjectForKey:@"model"];
    [unArchiver finishDecoding];
    NSLog(@"%@",model);
}

控制台结果

<****
HomeModel: 
name=iOSCoderZhao
sex=男
age=18
****>