(id)initWithCoder:(NSCoder *)decoder

 {

 　　if (self = [super init]) {

 　　unsigned int count = ;

 　　Ivar *ivars = class_copyIvarList([self class], &count);

 　　for (int i = ; i<count; i++) {

     　　

    　　 Ivar ivar = ivars[i];

     　　// 获取成员变量

     　　const char *name = ivar_getName(ivar);

     　　// 归档

     　　NSString *key = [NSString stringWithUTF8String:name];

     　　id value = [decoder decodeObjectForKey:key];

     　　// 设置

     　　[self setValue:value forKey:key];

 　　}

 　　free(ivars);

 　　}

 　　return self;

 }

 - (void)encodeWithCoder:(NSCoder *)encoder

 {

     unsigned int count = ;

     Ivar *ivars = class_copyIvarList([self class], &count);

     for (int i = ; i<count; i++) {

         Ivar ivar = ivars[i];

         //获取成员变量

         const char *name = ivar_getName(ivar);

         // 归档

         NSString *key = [NSString stringWithUTF8String:name];

         id value = [self valueForKey:key];

         [encoder encodeObject:value forKey:key];

     }

     free(ivars);

 }