For this app I have so far implemented the phone verification for CryptoWallet. Currently the app functions by taking in as input a US phone number. Then it parses, formats, and checks the number using the libPhoneNumberiOS library. If the phone number is accurate an alert message is displayed saying that a verification code will be sent. Otherwise an error alert is printed to try again.

• libPhoneNumber-iOS - phone number verification & formatting
• Material Design - UI elements including phone number field and verify button
• XCode 10 & Swift 4

• Action for the Verify Button to check the phone number the user has input
• Has do() catch() for error handling
• Gets phoneField input and validates using: parse(), format(),isValidNumber() from the libPhoneNumber-iOS library
• If the Action is not valid throws an error and alerts the user using: catchError, setGenerateAlert()

• checks the return of   isValidNumber()
• if the phone Number is not valid then throws an invalidPhoneNumber error

• Initializes new UIAlertController with the passes in alertTitle and Message
• Then adds an action through   .addAction() to generate a UIAlertAction as an OK button to cancel the alert.

• Once the user touches away from phone number field it goes away by using   .resignFirstResponder()

• Function in the Extension of the UITextFieldDelegate
• Takes whatever is being input into the text field and formats it continouously using the   format() function

• Function to format 10 digit phone numbers continuously
• formats the number by checking the digits and calling   replacingOccurrences()