How is a textfield valid for just email addresses?

September 29, 2022

I have this textfield

TextField("Your e-mail...",
          text: $email)
  .keyboardType(.emailAddress)
  .textContentType(.emailAddress)
  .disableAutocorrection(true)
  .autocapitalization(.none)

I type anything and I see no error. Double @, multiple dots and so one. No error so far.

How is this supposed to work?

>Solution :

Your code only adds suggestions/custom keyboard for email addresses. It does not validate whether or not a user entered a valid email address.

To return whether or not the field contains a valid email address, you will need to run the entered string through a function that utilizes regex:

  func isValidEmailAddr(strToValidate: String) -> Bool {
       let emailValidationRegex = "^[\\p{L}0-9!#$%&'*+\\/=?^_`{|}~-][\\p{L}0-9.!#$%&'*+\\/=?^_`{|}~-]{0,63}@[\\p{L}0-9-]+(?:\\.[\\p{L}0-9-]{2,7})*$"
       let emailValidationPredicate = NSPredicate(format: "SELF MATCHES %@", emailValidationRegex)
       return emailValidationPredicate.evaluate(with: strToValidate)
}

If an error is returned, you can then do something with that response i.e. show an error to the user.