问是否有向iOS添加错误消息的textFields标准？

EN

@IBAction func signUpButton(_ sender: UIButton) {
        
        if (emailTextField.text == "") {
            print("Please enter an email.")
        } else if (passwordTextField.text == "") {
            print("Please enter a password.")
        } else if (confirmPasswordTextField.text == "") {
            print("Please confirm your password.")
        } else if (confirmPasswordTextField.text != passwordTextField.text) {
            print("Please ensure that your passwords are matching.")
        } else if (!emailTextField.isEmail()) {
            print("Please enter a valid email address.")
        } else if (!passwordTextField.isValidPassword()) {
            print("Passwords must be at least 8 characters in length and must contain at least one letter and one number.")
        }
    }