Validated Sign Up

Instructions

1. Set up the delegate for all of your UITextFields.
2. Implement validation when a user taps the return button on the keyboard. Check out the documentation for which method you need.
3. The validation rules are as follows: * First Name:

   • 0 characters

   • No Digits * Last Name:

   • 0 characters

   • No Digits * Email:

   • 0 characters

   • valid email format (something@something.something) * Username:

   • 0 characters

   • No Digits * Password:

   • 6 characters

4. When the user taps return one each field. You should validate it, then present a UIAlertController with an appropriate error message. The alert view should have two buttons: OK and Clear. When you press Clear it should clear the currently editing textfield.
5. Start with only the first textfield enabled. If a textfield passes validation, then set the enabled property of the next textfield to YES (and so on and so forth).
6. When the final textfield is correct, enable the sign up button.

Hints

• To dismiss the keyboard call resignFirstResponder instance method on the currently editing UITextField. To move the focus to another UITextField call the becomeFirstResponder instance method on the UITextField you want to be focused.

Extra Credit

• This lab lends itself to some messy code if you don't put a lot of thought into the software design. How clean can you make the code? Remember each method should be short. Minimal copy-paste. Descriptive Names.