expected declaration after if statement - ios

Question

I have an "expected declaration" at this line:
if(userEmail.isEmpty || userPassword.isEmpty || userRepeatPassword.isEmpty)
Could you tell me why? Thank you in advance.
My code:
class RegisterPageViewController: UIViewController {
#IBOutlet weak var userEmailTextField: UITextField!
#IBOutlet weak var userPasswordTextField: UITextField!
#IBOutlet weak var repeatPasswordTextField: UITextField!
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view.
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
#IBAction func registerButtonTapped(_ sender: AnyObject) {
let userEmail = userEmailTextField.text;
let userPassword = userPasswordTextField.text;
let userRepeatPassword = repeatPasswordTextField.text
}
// Check for empty fields
if(userEmail.isEmpty || userPassword.isEmpty || userRepeatPassword.isEmpty)
{
// Display Alert Message
displayMyAlertMessage("All fields are required");
return;
}

Answer 1

Declare the variables in the class or even globally, not inside the button!
var userEmail: String = ""
var userPassword: String = ""
var userRepeatPassword: String = ""
Button declaration:
#IBAction func registerButtonTapped(_ sender: AnyObject) {
userEmail = userEmailTextField.text;
userPassword = userPasswordTextField.text;
userRepeatPassword = repeatPasswordTextField.text
}

Answer 2

if(userEmail.text == "" || userPassword.text == "" || userRepeatPassword.text == "")
{
// Display Alert Message
displayMyAlertMessage("All fields are required");
return;
}
or you can try
if(userEmail.text.isEmpty || userPassword.text.isEmpty || userRepeatPassword.text.isEmpty)
{
// Display Alert Message
displayMyAlertMessage("All fields are required");
return;
}
try to check blank string and it will work the same

Answer 3

I put the if statement inside a function and it worked.
Thank you for all your answers guys.
Like that:
func registerButtonTapped() {
let userEmail = ""
let userPassword = ""
let userRepeatPassword = ""
// Check for empty fields
if userEmail.isEmpty || userPassword.isEmpty || userRepeatPassword.isEmpty
{
// Display Alert Message
displayMyAlertMessage(userMessage:"All fields are required")
return
}