Firebase user can not be logged out - Swift - swift

Question

I run the app in Xcode simulator and log in with user and password then I log out, the logOutOutlet and bookingsOutlet are hidden and logInOutlet button shows. So far it behaves as expected.
2
Next, stop the app from Xcode and run it again, but now it behaves as if I was already logged in: shows logOutOutlet,bookingsOutlet, hides logInOutlet. It behaves in the same when the app is suspended, terminated or deleted. ( i.e, Stop in Xcode or cmd + H * 2 and swipe up.)
Now, assuming that I have an active logIn session in the next ViewController I try to retrieve data from FireBase Realtime DataBase, but I get this error. Error Domain=com.firebase Code=1 "Permission Denied" UserInfo={NSLocalizedDescription=Permission Denied}. Why can I not log out completely?
#IBAction func logOut(sender: AnyObject) {
// if the current user is logged in, try to log out and if logout is successful:
// hide: logOut button & bookings button
// show: logIn button
if FIRAuth.auth() != nil {
do {
try FIRAuth.auth()?.signOut()
print("the user is logged out")
} catch let error as NSError {
print(error.localizedDescription)
print("the current user id is \(FIRAuth.auth()?.currentUser?.uid)")
}
self.logInOutlet.hidden = false
self.logOutOutlet.hidden = true
self.bookingsOutlet.hidden = true
} // end of if.. FIRAuth.auth()
}
override func viewDidLoad() {
super.viewDidLoad()
// if the user is logged out
// hide: logOut button & bookings button
// show: logIn button
// if FIRAuth.auth()?.currentUser?.uid == nil {
if FIRAuth.auth() == nil {
self.logInOutlet.hidden = false
self.logOutOutlet.hidden = true
self.bookingsOutlet.hidden = true
// it still prints the user id, why?
if let userNOTLogged = FIRAuth.auth()?.currentUser?.uid {
print("User should NOT be logged \(userNOTLogged)")
}
// if the user is logged in
// hide: logIn Button
// show: logOut button & bookings button
} else if
FIRAuth.auth() != nil {
self.logInOutlet.hidden = true
self.logOutOutlet.hidden = false
self.bookingsOutlet.hidden = false
}
}
// Log in code
FIRAuth.auth()?.signInWithEmail(email.text!, password: password.text!, completion: { (authData, error) in
let customError = error?.localizedDescription
if error != nil {
print(customError)
// display an alert with the error
self.displayAlert()
} else {
print("The user has been logged in")
//if signIn was successful, instantiate the view controller with identifier SWrevelViewidentifier
let toMenuOptions = self.storyboard?.instantiateViewControllerWithIdentifier("SWrevelViewidentifier")
self.presentViewController(toMenuOptions!, animated: true, completion: nil)
}
})
}

Answer 1

I had this exact same problem. Since this happens when you relaunch, try putting this code in your app.delegate.
FIRAuth.auth()?.addAuthStateDidChangeListener { auth, user in
if let user = user {
// User is signed in.
} else {
// No user is signed in.
}
}