请问iOS里 "->" 是什么意思?

- (id)copyWithZone:(NSZone *)zone
{
         MyObj *copy = [[[self class] allocWithZone:zone] init];
         copy->name = [name copy];
         copy->imutableStr = [imutableStr copy];
//       copy->name = [name copyWithZone:zone];;
//       copy->imutableStr = [name copyWithZone:zone];//
         copy->age = age;

         return copy;
}
 c语言中结构体属性。。。相当于copy.name之类的吧...