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• (void)encodeWithCoder:(NSCoder *)enCoder{
  // 取得所有成员变量名
  NSArray *properNames = [[self class] propertyOfSelf];

  for (NSString propertyName in properNames) {
  /
  // 创建指向get方法
  SEL getSel = NSSelectorFromString(propertyName);
  // 对每一个属性实现归档
  [enCoder encodeObject:[self performSelector:getSel] forKey:propertyName];
  */

  id object = [self valueForKey:propertyName];
  [enCoder encodeObject:object forKey:propertyName];
  

  }
  }

// 解档

• (id)initWithCoder:(NSCoder *)aDecoder{
  // 取得所有成员变量名
  NSArray *properNames = [[self class] propertyOfSelf];

  for (NSString propertyName in properNames) {
  /
  // 创建指向属性的set方法
  // 1.获取属性名的第一个字符，变为大写字母
  NSString *firstCharater = [propertyName substringToIndex:1].uppercaseString;
  // 2.替换掉属性名的第一个字符为大写字符，并拼接出set方法的方法名
  NSString *setPropertyName = [NSString stringWithFormat:@"set%@%@:",firstCharater,[propertyName substringFromIndex:1]];
  SEL setSel = NSSelectorFromString(setPropertyName);
  [self performSelector:setSel withObject:[aDecoder decodeObjectForKey:propertyName]];
  */

  id object = [aDecoder decodeObjectForKey:propertyName];
  [self setValue:object forKey:propertyName];
  

  }
  return self;
  }