Validating user swift 4, login page - ios

Question

I need to my button proceedToAppFeatures to run the code and display an alert of success or failure login(just a single user, for now)
I have tried self.showAlert and self.present
Code:
import UIKit
import FLAnimatedImage
import ImageIO
import UserNotifications//import this to use user notifications
import Firebase
class ViewController: UIViewController, UITextFieldDelegate{
#IBOutlet weak var background: FLAnimatedImageView!
#IBOutlet weak var emailTextField: UITextField!
#IBOutlet weak var passwordTextField: UITextField!
#IBOutlet weak var lblValidationTxt: UILabel!
#IBOutlet weak var lblValidationMessage: UILabel!
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view.
background.loadGif(name: "neon lights")
passwordTextField.isSecureTextEntry = true// the password will no be visible
emailTextField.delegate = self
passwordTextField.delegate = self
let Tap:UITapGestureRecognizer = UITapGestureRecognizer(target: self, action: #selector(DismissKeyboard))//here i have used the function to didmiss the keyboard
view.addGestureRecognizer(Tap)
let center = UNUserNotificationCenter.current()
//this initialize the permission that will appear on user screen
center.requestAuthorization(options: [.alert, .sound, .badge]) {
(granted,error) in
//enable or disable features based on the authorization
}
// emailTextField.text = ""
// passwordTextField.text = ""//on view did load to store text field property
}
#objc func DismissKeyboard() {//function that implements the type outside the screen
view.endEditing(true)
}
#IBAction func sigInButton(_ sender: UIButton) {
performSegue(withIdentifier: "userData", sender: true)
}
func textFieldShouldReturn(_ textField: UITextField) -> Bool {
if textField == emailTextField {
textField.resignFirstResponder()
}else{
passwordTextField.becomeFirstResponder()//just to decide which of the buttons will respond after a tab is pressed
passwordTextField.resignFirstResponder()
}
return true
}
func showAlert(title: String, message: String){
let alert = UIAlertController(title: title, message: message, preferredStyle: UIAlertController.Style.alert)
alert.addAction(UIAlertAction(title: "OK", style: UIAlertAction.Style.default, handler: {(action) in alert.dismiss(animated: true, completion: nil)}))
self.present(alert, animated: true, completion: nil)
}
func isValidEmail(testStr:String) -> Bool {
let emailRegEx = "[A-Z0-9a-z._%+-]+#[A-Za-z0-9.-]+\\.[A-Za-z]{2,64}"
let emailTest = NSPredicate(format:"SELF MATCHES %#", emailRegEx)
return emailTest.evaluate(with: testStr)
}
#IBAction func proceedToAppFeatures(_ sender: Any) {
let email = isValidEmail(testStr: emailTextField.text!)
if email == false{
self.showAlert(title: "ERROR", message: "This is not a valid e-mail. Please try again")
emailTextField.text = ""
}else{
self.showAlert(title: "Success", message: "Yousucessifully loged in")
//performSegue(withIdentifier: "formPage", sender: true)
}
let myEmail: String!
myEmail = emailTextField.text!
let myPassword: String!
myPassword = passwordTextField.text!
if(myEmail == "leandroaaramos" && myPassword == "123456"){
//performSegue(withIdentifier: "homeSegue", sender: nil)
//code for the truth
print("You are success")
}else if (myEmail.isEmpty && myPassword.isEmpty){
//here i put the alert message
let alert = UIAlertController(title: "Wow", message: "Hold on fill the gaps", preferredStyle: UIAlertController.Style.alert)
//add an action to the alert
alert.addAction(UIAlertAction(title: "Close", style: UIAlertAction.Style.default, handler: nil))
self.present(alert, animated: true, completion: nil)
self.showAlert(title: "Empty field", message: "Try again")
}else {
//here i put the alert message
let alert = UIAlertController(title: "Ops", message: "Your account is not here", preferredStyle: UIAlertController.Style.alert)
//add an action to the alert
alert.addAction(UIAlertAction(title: "Try Again", style: UIAlertAction.Style.default, handler: nil))
self.present(alert, animated: true, completion: nil)
self.showAlert(title: "Sorry", message: "Can't find you.")
}
}
}
I want go to my loginViewController, if the user leandroaaramos and password 123456 was typed.