Swift IBAction Iteration - ios

Question

I think i have been coding for to many hours and i am getting delirious. I need a second eye to view my obvious problems.
-My function called ( #IBAction func SignIn ) at the bottom of the code ends after a single click. I click once works fine, click twice the code gets terminated and is done. How can I re-iterate this function so I can have it keep going every time I click the IB action button.
import UIKit
import Firebase
import FirebaseDatabase
import KeychainSwift
class SignUpController: UIViewController {
//Variable List
var ref = FIRDatabase.database().reference() //Data Base Initialization
public var validPassword = false //Both passwords match
//Represent Red or Green password Image
#IBOutlet weak var myImageView: UIImageView!
//INPUT - User Input from UI Text Fields
#IBOutlet weak var emailField: UITextField!
#IBOutlet weak var passwordField: UITextField!
#IBOutlet weak var passwordConfirmField : UITextField!
#IBOutlet weak var usernameField : UITextField!
#IBOutlet weak var nameField : UITextField!
/****************************View Loads*****************************/
override func viewDidLoad() {
super.viewDidLoad()
ref = FIRDatabase.database().reference()
myImageView.image = UIImage(named: "confirmPaswordRed")
}
//PROCESS - Checks is user has already been logged in
override func viewDidAppear(_ animated: Bool) {
let currentUser = FIRAuth.auth()?.currentUser
if currentUser != nil {
performSegue(withIdentifier: "SignIn", sender: nil)
}
}
/******************************************************************/
/****************************Functions*****************************/
func CompleteSignIn(id: String){
let keyChain = DataService().keyChain
keyChain.set(id , forKey: "uid")
}
//Send all data text fields to Firebase Database
func sendToFirebaseDatabase(userID : String) {
let name : String = self.nameField.text!
let username : String = self.usernameField.text!
let userEmail : String = self.emailField.text!
let userPassword : String = self.passwordField.text!
self.ref.child("Users").child(userID).setValue(["Name": name, "Username": username, "Email": userEmail, "Password" : userPassword])
}
//Determines Red or Green password validation
#IBAction func passwordConfirmImage(_ sender: UITextField) {
let userConfirmPassword : String? = self.passwordConfirmField.text!
let userPassword : String? = self.passwordField.text!
if (userPassword == userConfirmPassword) && (userPassword != "") {
validPassword = true
let greenImage = UIImage(named: "confirmPasswordGreen")
myImageView.image = greenImage
print("Function entry test")
}else {
myImageView.image = UIImage(named: "confirmPaswordRed")
validPassword = false
}
}
/******************************************************************/
/****************************IBACTIONS*****************************/
//If SignUp button is pressed user will be directed to sign up page
#IBAction func LoginPressed(_ sender: Any) {
self.performSegue(withIdentifier: "BackToLogin", sender: nil)
}
/*Sign In Action: If both password and email contain text lets put them into string variables
called email & password. Creates user and authorizes sign in */
#IBAction func SignIn(_ sender: Any){
if let email = emailField.text, let password = passwordField.text {
FIRAuth.auth()?.signIn(withEmail: email, password: password) { (user, error) in
if ((error == nil) && (self.validPassword) == true) {
self.CompleteSignIn(id: user!.uid) //Completes Database Sign in
print("Sign in Test")
self.performSegue(withIdentifier: "SignIn", sender: nil)
} else {
FIRAuth.auth()?.createUser(withEmail: email, password: password) { (user, error) in
if ((error == nil) && (self.validPassword) == false) {
Alerts().invalidSignUpAlert(sender: self) //Alert for invalid email & Password
print("cant sign in user") //Programmer Debugging
} else {
if self.validPassword == true{
let userID : String = user!.uid //initialize userId String
self.sendToFirebaseDatabase(userID: userID) //Call sendToFirebaseDatabase
self.performSegue(withIdentifier: "SignIn", sender: nil) //goto Login Page
}
}
}
}
}
}
}
}