Looping all properties of a class?

Let's say I have some class that holds a structure of data :

classA:
@property(strong)NSString *name;
@property(strong)NSString *place;
@property(strong)NSString *age;

Then I create an instance of classA and pass it to some other classB ,and this classB should save all A's values to memory (for example to user defaults) .

How can classB, get classA as argument, and then without knowing what properties are inside it, just loop over all of them and save them to memory ?

The goal is to add and remove items from classA without B knowing about them, but B can loop them and save them whatever they are (without using a single array in A).

Based on this Apple Documentation, you can do so.

You will have to import runtime framework as below,

     #import <objc/runtime.h>


    id LenderClass = objc_getClass("Lender");
    unsigned int outCount, i;
    objc_property_t *properties = class_copyPropertyList(LenderClass, &outCount);
    for (i = 0; i < outCount; i++) {
        objc_property_t property = properties[i];
        fprintf(stdout, "%s %s\n", property_getName(property), property_getAttributes(property));
    }


  // This class_copyPropertyList will do that purpose.
  objc_property_t *properties = class_copyPropertyList(LenderClass, &outCount);