Statement requires expression of integer type('id' invalid) with switch statement and pointer - Objective C

The function I'm working on receives an enum object pointer which I'm trying to use in a switch case to check against the enum, but it's throwing the "Statement requires expression of integer type('id' invalid)" right at the switch statement." error, how can I handle this, I thought if there is a way I can get the object from the pointer and check

thanks in advance

inline PropType toPropType(ZPropType* propType){

  switch(propType){ // error statement requires expression of integer type ZPropType
    case ZPropType.FUEL:
      return PropType.FUEL;
    case ZPropType.ELECTRIC:
      return PropType.ELECTRIC;
    case ZPropType.WALK:
      return PropType.WALK;

  }

}