先看一个初始版的
<pre>`

• (void)viewDidLoad {
  [super viewDidLoad];

  Person *person = [[Person alloc]init];
  person.name = @"ezreal";
  person.height = @"134";
  NSString *filePath = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) firstObject];

  NSString *path = [filePath stringByAppendingPathComponent:@"test.plist"];
  

  BOOL result = [NSKeyedArchiver archiveRootObject:person toFile:path];
  if (result) {
  NSLog(@"success");
  }else
  {
  NSLog(@"fail");
  }
  NSLog(@"%@",filePath);

}
`</pre>

<pre>`
-(void)encodeWithCoder:(NSCoder *)aCoder
{
[aCoder encodeObject:self.name forKey:@"name"];
[aCoder encodeObject:self.height forKey:@"height"];
}

//当从文件中读取一个对象的时候就会调用方法
//在该方法中说明如何读取保存在文件中的对象

-(instancetype)initWithCoder:(NSCoder *)aDecoder
{
if (self = [super init]) {
self.name = [aDecoder decodeObjectForKey:@"name"];
self.height = [aDecoder decodeObjectForKey:@"height"];
}
return self;
}
`</pre>

runtime版本

<pre>`
// 返回self的所有对象名称

• (NSArray *)propertyOfSelf{
  unsigned int count = 0;

  // 1. 获得类中的所有成员变量
  Ivar *ivarList = class_copyIvarList(self, &count);

  NSMutableArray *properNames =[NSMutableArray array];
  for (int i = 0; i < count; i++) {
  Ivar ivar = ivarList[i];

    // 获得成员属性名
    NSString *name = [NSString stringWithUTF8String:ivar_getName(ivar)];
    
  [properNames addObject:key];
  

  }
  free(ivarList);
  return [properNames copy];
  }

// 归档

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

  for (NSString *propertyName in properNames) {
  [enCoder encodeObject:[self valueForKey:propertyName] 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) {

    [self setValue:[aDecoder decodeObjectForKey:propertyName] forKey:propertyName];
  

  }
  return self;
  }

`</pre>