iOS利用runtime 对Model动态归档与解归档

首先创建model，这里先就叫UserModel

@interface UserModel : NSObject<NSCoding>

@property (nonatomic, copy) NSString *name;
@property (nonatomic, copy) NSString *nickName;
@property (nonatomic, copy) NSString *realName;
@property (nonatomic, copy) NSString *birthday;
@property (nonatomic, copy) NSString *email;
@property (nonatomic, copy) NSString *cerNumber;
@property (nonatomic, copy) NSString *phoneNumber;

@end


#import "UserModel.h"

@implementation  UserModel
//必须实现的代理方法
- (void)encodeWithCoder:(NSCoder *)encoder
{
    unsigned int count = 0;
    //  利用runtime获取实例变量的列表
    Ivar *ivars = class_copyIvarList([self class], &count);
    for (int i = 0; i < count; i ++) {
        //  取出i位置对应的实例变量
        Ivar ivar = ivars[i];
        //  查看实例变量的名字
        const char *name = ivar_getName(ivar);
        //  C语言字符串转化为NSString
        NSString *nameStr = [NSString stringWithCString:nameencoding:NSUTF8StringEncoding];
        //  利用KVC取出属性对应的值
        id value = [self valueForKey:nameStr];
        //  归档
        [encoder encodeObject:value forKey:nameStr];
    }
   
    //  记住C语言中copy出来的要进行释放
    free(ivars);
   
}

- (id)initWithCoder:(NSCoder *)decoder
{
    if (self = [super init]) {
        unsigned int count = 0;
        Ivar *ivars = class_copyIvarList([self class], &count);
        for (int i = 0; i < count; i ++) {
            Ivar ivar = ivars[i];
            const char *name = ivar_getName(ivar);
           
            //
            NSString *key = [NSString stringWithCString:name encoding:NSUTF8StringEncoding];
            id value = [decoder decodeObjectForKey:key];
            //  设置到成员变量身上
            [self setValue:value forKey:key];
        }
       
        free(ivars);
    }
    return self;
}

接下来在Controller中 将UserModel归档，在需要的地方解归档：

    UserModel *model = [[UserModel alloc] init];
    model.name = @"姓名";
    model.nickName = @"凉凉";
    model.realName = @"真实姓名";
    model. birthday = @"1998.10.18";
    model. email = @"1567345678@qq.com";
    model. cerNumber = @"5678886625262";
    model. phoneNumber = @"16782828823";
//先把model归档
 1. NSData *userData = [NSKeyedArchiver archivedDataWithRootObject:model];
2.[userdefaults setObject:homeData forKey:@“ model“];
3.在需要的地方解归档
NSData *getData = [userdefaults objectForKey:@“homeModel”];
homeModel = [NSKeyedUnarchiver unarchiveObjectWithData:getData];