Provides visual formatting of phone number fields, while typing. Format is defined by Regex patterns and can be localized.

2016-09-17 Updated to Swift 3.0, with prodding from jstart

2015-10-16 Updated to Swift 2.0, thanks to duffpod

There are two files to add to your app: PhoneNumberFormatter.swift and StringExtension.swift.

(If you already have Dollar/Cent or lots of string customization, you may want to alter StringExtension/LocalizedPhone to utilize your own code. Otherwise, yay new String features!)

Then, wire up your phone number field's Editing Changed action and call the formatter in there:

var phoneFormatter = PhoneNumberFormatter()
@IBAction func formatField(sender: UITextField) {
    sender.text = phoneFormatter.format(sender.text, hash: sender.hash)
}

The formatter will change 2065551234 to (206) 555-1234 (sorry, the formatter does not currently understand 7-digit phone numbers). It will also recognize backspace commands and remove number values instead of formatting characters, to make for a better user experience.

• There is an additional phoneFormatter.isValid() function available to test if a complete phone number was entered (to call before submitting the form).
• You can add new locales and formats easily with Regex.