class_copyPropertyList在Swift 5中不起作用。原因是什么？

Question

class_copyPropertyList在Swift 5中提供了空属性，并且在Swift 3中工作正常

 extension NSObject {

      func toDictionary(from classType: NSObject.Type) -> [String: Any] {

          var propertiesCount : CUnsignedInt = 0
          let propertiesInAClass = class_copyPropertyList(classType, &propertiesCount)
          let propertiesDictionary : NSMutableDictionary = NSMutableDictionary()

          for i in 0 ..< Int(propertiesCount) {
              let property = propertiesInAClass?[i]
              let strKey = NSString(utf8String: property_getName(property)) as String?
              if let key = strKey {
                  propertiesDictionary.setValue(self.value(forKey: key), forKey: key)
              }
          }
          return propertiesDictionary as! [String : Any]
      }
    }

//将其称为NSObject子类

    let product = Product()
    let dict = product.toDictionary(from: Product.self)
    print(dict)