Use of unresolved identifier when creating a string - ios

Question

I am very new to swift, but i can work with javascript and php so thought this would make sense to me. I have read so many posts on this topic but non really explain mine. I have the following code which is pretty straight forward. I have several text fields with login information to pass on to php. But when i try to use the var from a function it is not possible. So i figured that out but when i try to redefine the vars outside of the function with different var i am still keep getting the error. This is the code so far
import UIKit
class RegisterPage: UIViewController, UITextFieldDelegate{
#IBOutlet weak var userEmailTextField: UITextField!
#IBOutlet weak var userPasswordTextField: UITextField!
#IBOutlet weak var userPasswordConfirmTextField: 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 registerTapped(sender: AnyObject) {
let userEmail = userEmailTextField.text
let userPassword = userPasswordTextField.text
let userConfirmPassword = userPasswordConfirmTextField.text
// check for empty fields
if(userEmail.isEmpty || userPassword.isEmpty || userConfirmPassword.isEmpty)
{
// Display alert message
displayMyAlertMessage("Alle velden gelieve invullen");
return;
}
//Check if passwords match
if(userPassword != userConfirmPassword){
// Display alert message
displayMyAlertMessage("Wachtwoorden komen niet overeen");
return;
}
}// end of registerTapped button
// send data to server side
static var urlConn: NSURL = NSURL(string: "http://xxxxxxxxx")!
var request: NSMutableURLRequest = NSMutableURLRequest(URL:urlConn);
var credLogin = "email=\(userEmail)&password=\(userPassword)"
the following line is giving the unresolved identifier error
var credLogin = "email=\(userEmail)&password=\(userPassword)"
i have tried so many different things, but i can't move the var in the function outside of it, and i have had also in other code blocks errors like this, i really would like to know how this works in swift.
Thanks

Answer 1

The variables userEmail and userPassword are declared within the scope of the registerTapped method. They are not visible outside this method.
Either put the line
var credLogin = "email=\(userEmail)&password=\(userPassword)"
in the method or declare the variables as instance variables right after IBOutlet declarations.
The code to send data to server side must be also executed within a method.