how to use libPhoneNumber-iOS for formats phone numbers on-the-fly when users enter each digit

Question

libPhoneNumber has function AsYouTypeFormatter (formats phone numbers on-the-fly when users enter each digit). Work example:

PhoneNumberUtil phoneUtil = PhoneNumberUtil.getInstance();
AsYouTypeFormatter formatter = phoneUtil.getAsYouTypeFormatter("US");
System.out.println(formatter.inputDigit('6'));  // Outputs "6"
...  // Input more digits
System.out.println(formatter.inputDigit('3'));  // Now outputs "650 253"

How can I do it with libPhoneNumber-iOS ? It's really? I didn't find similar function.

Thanks!