Traversing class members

-(Nsdictionary *) todictionary{    nsmutabledictionary *dictionaryformat = [nsmutabledictionary dictionary];  Gets the current class type class    CLS = [self class];        unsigned int ivarscnt = 0;    Gets a list of class member variables, ivarscnt for the number of class members    Ivar *ivars = class_copyivarlist (CLS, &ivarscnt);        Iterate through the list of member variables, where each variable is a struct of type Ivar for    (const Ivar *p = Ivars; p < Ivars + ivarscnt; ++p)    {        Ivar const IVAR = *p;                Gets the variable name        nsstring *key = [NSString stringwithutf8string:ivar_getname (Ivar)];        If this variable is not declared in the class struct and declared as property only, then the variable name is prefixed with ' _ ' underline        //such as @property (retain) nsstring *abc; then key = = _ABC;                Gets the variable value ID of value        = [self valueforkey:key];                Gets the variable type        //through TYPE[0] can judge its specific built-in type        const char *type = ivar_gettypeencoding (Ivar);                if (value)        {            [Dictionaryformat setobject:value forkey:key];        }     }    return Dictionaryformat;}

Traversing class members