In my code I'm using one of the UITextFieldDelegate methods to detect when a textfield has been left so I can do a check and alert the user.
The first check is the amount of characters they have type into the textfield.
Here is my code:
override func textFieldDidEndEditing(textField: UITextField!) {
    if textField == self.signUpView.usernameField {
        if textField.text.length // this doesn't work
    }
    if textField == self.signUpView.passwordField {
    }
    if textField == self.signUpView.emailField {
    }
}
How is this done in swift?
