AsYouTypeFormatter for international phone numbers about libphonenumber-ios HOT 2 CLOSED

NSString *formattedPhoneNumberSubstring(NSString *phoneNumber) {
    NBPhoneNumberUtil *phoneUtil = [NBPhoneNumberUtil sharedInstance];
    phoneNumber = [phoneUtil normalizeDigitsOnly:phoneNumber];
    NSString *nationalNumber;
    NSNumber *countryCode = [phoneUtil extractCountryCode:phoneNumber nationalNumber:&nationalNumber];
    if ([countryCode isEqualToNumber:@0])
        return phoneNumber;

    NSString *regionCode = [[phoneUtil regionCodeFromCountryCode:countryCode] objectAtIndex:0];
    NSString *paddedNationalNumber = [nationalNumber stringByPaddingToLength:15 withString:@"0" startingAtIndex:0];
    NSString *formatted;
    NSString *formattedSubstr;
    for (int i=0; i < paddedNationalNumber.length; i++) {
        NSError *error = nil;
        formattedSubstr = [phoneUtil format:[phoneUtil parse:[paddedNationalNumber substringToIndex:i] defaultRegion:regionCode error:&error]
                               numberFormat:NBEPhoneNumberFormatINTERNATIONAL error:&error];
        if (getExtraCharacters(formattedSubstr) > getExtraCharacters(formatted)) // extra characters means more formatted
            formatted = formattedSubstr;
    }

    // Preparing the buffer for phoneNumber
    unichar phoneNumberBuffer[phoneNumber.length+1];
    [phoneNumber getCharacters:phoneNumberBuffer range:NSMakeRange(0, phoneNumber.length)];

    // Preparing the buffer for formatted
    unichar formattedBuffer[formatted.length+1];
    [formatted getCharacters:formattedBuffer range:NSMakeRange(0, formatted.length)];

    int j=0;
    for(int i = 0; i < phoneNumber.length && j < formatted.length; i++) {
        while(formattedBuffer[j] != phoneNumberBuffer[i]) j++;
        j++;
    }

    return [formatted substringToIndex:j];
}

RAC(self,phoneNumberTextField.text) =
[[self.phoneNumberTextField.rac_textSignal
  map:^NSString*(NSString *phoneNumber) {
      return formattedPhoneNumberSubstring(phoneNumber);
  }] deliverOn:[RACScheduler mainThreadScheduler]];