NSFormatter subclass for formatting phone numbers.
ECPhoneNumberFormatter *formatter = [[ECPhoneNumberFormatter alloc] init];
NSString *formattedNumber = [formatter stringForObjectValue:@"2345677890"]
// formattedNumber = @"(234) 567-7890"ECPhoneNumberFormatter *formatter = [[ECPhoneNumberFormatter alloc] init];
id objectValue;
NSString *error;
[formatter getObjectValue:&objectValue forString:@"1 (234) 567-8900" errorDescription:&error];
// objectValue = @"12345678900"ECPhoneNumberFormatter *formatter = [[ECPhoneNumberFormatter alloc] init];
textField.cell.formatter = formatter;
// textField.objectValue will be unformatted
// textField.stringValue will be formattedCopyright (c) 2013 Michael Enriquez (http://enriquez.me)
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