See if a function has finished using a if-statement

So when the function dissmissAlert has completed (the first alertDialog disappears). I want the following alertDialog to show directly afterwards, which is created in the func saveLogin.

typealias FinishedAlert = () -> Bool


var firstPasswordSaveAlert: UIAlertController!



    @IBAction func saveLogin(_ sender: Any) {


    if loginPasswordTf.text != "" {
         showAlert()
    }
    if FinishedAlert == true {


        UserDefaults.standard.set(loginPasswordTf.text, forKey: "loginpassword")

        let alert = UIAlertController(title: "You need it to access this app", message: "Here it is: " + String(describing: UserDefaults.standard.object(forKey: "loginpassword")!), preferredStyle: UIAlertControllerStyle.alert)

        alert.addAction(UIAlertAction(title: "Got it!", style: UIAlertActionStyle.destructive, handler: nil))
        self.present(alert, animated: true, completion: nil)

    }

}        


func showAlert() {
    if loginPasswordTf.text != "" {
        self.firstPasswordSaveAlert = UIAlertController(title: "IMPORTANT", message: "It's very important that you remember your password", preferredStyle: UIAlertControllerStyle.alert)
        self.present(self.firstPasswordSaveAlert, animated: true, completion: nil)
        Timer.scheduledTimer(timeInterval: 5.0, target: self, selector: #selector(ViewController.dismissAlert), userInfo: nil, repeats: false)
    }
}

func dismissAlert(completed: FinishedAlert) {
    // Dismiss the alert from here
    self.firstPasswordSaveAlert.dismiss(animated: true, completion: nil)


    completed()
}

How do I check if dismissAlert() completed it's tasks?

Thanks!