Parse custom element using adaptive card sdk in iOS

Question

Want to write a deserialize method for parsing the new property in adaptive card using the adaptive card SDK at the iOS client. Example :

{

  "type": "AdaptiveCard",

  "appId": "",

  "new_property ": {},

  "body": [],

  "$schema": "http://adaptivecards.io/schemas/adaptive-card.json",

  "version": "1.2"

}

Consider "new_property" as the custom element of adaptive card and I want to write my own deserialize method for parsing this.

Approaches tried :

ACRRegistration *registration = [ACRRegistration getInstance];
[registration setCustomElementParser:[[New_propertyParser alloc] init] key:@"new_property"];

But this is not working and I also added a deserialize method to this parser class but control is not reaching there.