UIAlertController Not Within The Window Hierarchy - ios

Question

First of all please do not mark duplicate on this question Ive done my research on this topic, and not only have the most recent answers been from over a year ago, but they have also been in C#. Mine also differs from those because I am trying to present my UIView from what I assume to be a child of a child view. But I'm not 100% sure about this. So, here is what my code dump looks like after the suggestions.
import UIKit
import Firebase
class LoginViewController: UIViewController, UITextFieldDelegate{
#IBOutlet weak var usernameTxt: UITextField!
#IBOutlet weak var emailTxt: UITextField!
#IBOutlet weak var passwordTxt: UITextField!
#IBOutlet weak var confirmPassTxt: UITextField!
override func viewDidLoad() {
super.viewDidLoad()
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
#IBAction func nextScreen(sender: UIButton) {
if(emailTxt.text == "" || passwordTxt.text == "" || confirmPassTxt.text == "" || usernameTxt.text == ""){
let alertController = UIAlertController(title: "Wait!", message: "You didn't fill out the required fields, please do so and try again. ", preferredStyle: .Alert)
let defaultAction = UIKit.UIAlertAction(title: "OK", style: .Default, handler: nil)
alertController.addAction(defaultAction)
self.presentViewController(alertController, animated: true, completion: nil)
}else{
if(validateEmail(emailTxt.text!)){
emailCheck(emailTxt.text!){isValid in if isValid{self.secondRound({ (goodMail, goodPassL, goodPassTxt, nameGood) in
if (goodMail && goodPassL && goodPassTxt && !nameGood){
print("good")
}else{
self.showAlert("Else", description: "Got it?") }
})}else{let alertController=UIAlertController(title: "Whoops!", message: "That email address has already been taken, please try another one", preferredStyle: .Alert)
let defaultAction = UIKit.UIAlertAction(title: "OK", style: .Default, handler: nil)
alertController.addAction(defaultAction)
alertController.parentViewController
self.presentViewController(alertController, animated: true, completion: nil)
}}
}else{
let alertController = UIAlertController(title: "Whoops!", message: "That doesnt appear to be a valid email address, please check your information and try again!", preferredStyle: .Alert)
let defaultAction = UIKit.UIAlertAction(title: "OK", style: .Default, handler: nil)
alertController.addAction(defaultAction)
alertController.parentViewController
presentViewController(alertController, animated: true, completion: nil)
}
}
}
func showAlert(title: String, description: String){
let alertController: UIAlertController = UIAlertController(title: title, message: description, preferredStyle: .Alert)
let defaultAction = UIKit.UIAlertAction(title: "OK", style: .Default, handler: nil)
alertController.addAction(defaultAction)
UIApplication.sharedApplication().keyWindow?.rootViewController?.presentViewController(alertController, animated: true, completion: nil)
self.presentViewController(alertController, animated: true, completion: nil)
}
override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
let DestinationVC : Login2VC = segue.destinationViewController as! Login2VC
DestinationVC.prepareEmail = emailTxt.text!
DestinationVC.preparePass = passwordTxt.text!
}
func validateEmail(canidate: String) -> Bool {
let emailRegex = "[A-Z0-9a-z._%+-]+#[A-Za-z0-9.-]+\\.[A-Za-z]{2,6}"
return NSPredicate(format: "SELF MATCHES %#", emailRegex).evaluateWithObject(canidate)
}
func nameFilter(input : String)-> Bool{
var profanity : Bool = true
let dataRef = FIRDatabase.database().reference()
dataRef.child("Profanity").observeSingleEventOfType(.Value) { (snap: FIRDataSnapshot) in
if(snap.exists()){
if(snap.value! as! NSArray).containsObject(input){
print("our ears!")
profanity = true
}else{
profanity = false
}
}
}
return profanity
}
func emailCheck(input: String, callback: (isValid: Bool) -> Void) {
FIRAuth.auth()?.signInWithEmail(input, password: " ") { (user, error) in
var canRegister = false
if error != nil {
if (error?.code == 17009) {
canRegister = false
} else if(error?.code == 17011) {
//email doesn't exist
canRegister = true
}
}
callback(isValid: canRegister)
}
}
func textFieldShouldReturn(textField: UITextField) -> Bool {
textField.resignFirstResponder()
return true
}
func secondRound(callback:(goodMail:Bool, goodPassL:Bool, goodPassTxt:Bool, nameGood:Bool)->Void){
let availableEmail : Bool = true
var passwordMatch : Bool = false
var passwordLength : Bool = false
var profanity : Bool = false
if(passwordTxt.text!==confirmPassTxt.text!){passwordMatch=true}else{passwordMatch=false}
if(passwordTxt.text!.characters.count>=6&&confirmPassTxt.text!.characters.count>=6){passwordLength=true}else{passwordLength=false}
if(nameFilter(usernameTxt.text!)){profanity=true}else{profanity=false}
callback(goodMail: availableEmail, goodPassL: passwordLength, goodPassTxt: passwordMatch, nameGood: profanity)
}
}
Essentially, what I am trying to do is:
Check to see if the inputted text is formatted as an email correctly
Check to see if the name is available
Check if the username contains profanity (pulled as a json from firebase)
Check to see if the passwords match
Check too see if the passwords are at least 6 characters in length
Each false result would have its own UIAlertView that results from it, but whenever I try to add these views they do not show up, and the app returns with this error.
Note, the false event does intact appear in the first condition only. Other than that, nothing happens.
This is the error I have been getting, and while it seems pretty straight forward I cannot figure out hoe to fix it, nor find any recent information online on how to accomplish this task.
> Warning: Attempt to present <UIAlertController: 0x7fb513fb8bc0> on
> <myApp.LoginViewController: 0x7fb513c6e0a0> whose view is not in the
> window hierarchy!
The logical answer to this would be:
Hey, why don't you just add the window to the hierarchy and be done?
Well, to that question I have a question, if the window is not apart of the hierarchy, then why is the view itself even displaying. Furthermore, why would the first set of UIAlerts be displaying, but as soon as I get into a nested if they cease? Any ideas on how to fix this terrible error?
Thanks all