found a method

NSError err; ABAddressBook iOSAddressBook = ABAddressBook.Create(out err); iOSAddressBook.ExternalChange += (object sender, ExternalChangeEventArgs e) => { Console.WriteLine("qorkkkk"); }; 

but it does not work

  • Well, judging by the logic, you are creating a new address book. You need to get an existing one. - Alexis
  • I need some kind of observer. so that when a user adds or changes a contact, the event will work - Vadim Ursol

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