constraint

 override func viewDidLoad() {
        super.viewDidLoad()
        self.navigationController?.isNavigationBarHidden = false
        txtEmail.becomeFirstResponder()
        //bLogin.backgroundColor = UIColor.init(red: 0x00/255, green: 0x9f/255, blue: 0xf9/255, alpha: 1.0)

        txtPassword.editConfig(image: "Password Filled_20.png", position: true)
        txtEmail.editConfig(image: "Message Filled_20.png", position: true)
        registerKeyboardListeners()
    }
    override func viewWillAppear(_ animated: Bool) {
        super.viewWillAppear(animated)
        originConstraintConstant = bottomConstraint.constant
    }

    @IBAction func asd(_ sender: Any) {


    }


    override func viewDidDisappear(_ animated: Bool) {
        super.viewDidDisappear(animated)
        deregisterKeyboardListeners()
    }

    func registerKeyboardListeners() {
        NotificationCenter.default.addObserver(self, selector: #selector(Tela2_Login.keyboardWillShow(notification:)), name: NSNotification.Name.UIKeyboardWillShow, object: nil)
        NotificationCenter.default.addObserver(self, selector: #selector(Tela2_Login.keyboardWillHide(notification:)), name: NSNotification.Name.UIKeyboardWillHide, object: nil)
    }

    func deregisterKeyboardListeners(){
        NotificationCenter.default.removeObserver(self, name: NSNotification.Name.UIKeyboardWillShow, object: nil)
        NotificationCenter.default.removeObserver(self, name: NSNotification.Name.UIKeyboardWillHide, object: nil)
    }

    func keyboardWillShow(notification: Notification) {
        let userInfo = notification.userInfo
        let keyboardSize = userInfo![UIKeyboardFrameEndUserInfoKey] as! NSValue
        bottomConstraint.constant = keyboardSize.cgRectValue.height + 11
    }

    func keyboardWillHide(notification: Notification) {
        bottomConstraint.constant = originConstraintConstant
    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }

    override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {
        self.view.endEditing(true)
    }

    @IBAction func bLogin(_ sender: UIButtonRounded) {
        if (txtEmail.text == "") || (txtPassword.text == "") {
            let alert = UIAlertController(title: "Atenção", message: "Insira todos os campos!", preferredStyle: UIAlertControllerStyle.alert)
            alert.addAction(UIAlertAction(title: "OK", style: UIAlertActionStyle.default, handler: nil))
            self.present(alert, animated: true, completion: nil)
        } else {
            if let email = txtEmail.text , let pass = txtPassword.text {
                FIRAuth.auth()?.signIn(withEmail: email, password: pass, completion: {(user, error) in
                    if user != nil {
                        if let user = FIRAuth.auth()?.currentUser {
                            self.databaseRef.child("Clients").child(user.uid).child("levelAcess").observe(.value, with: { (snapshot) in
                                let level = snapshot.value as? String
                                UserDefaults.standard.set(level, forKey: "levelAcess")
                                UserDefaults.standard.synchronize()
                                if level == "1" {
                                    self.setupProfileUser()
                                } else {
                                    self.setupProfileAdm()
                                }

                            })
                        }
                    } else {
                        let alert = UIAlertController(title: "Login Incorreto", message: "Usuário inexistente. Verifique se o email e senha estão corretos!", preferredStyle: UIAlertControllerStyle.alert)
                        alert.addAction(UIAlertAction(title: "OK", style: UIAlertActionStyle.default, handler: nil))
                        self.present(alert, animated: true, completion: nil)
                    }
                })
            }
        }

    }


    @IBAction func bLoginFB(_ sender: UIButtonBorder) {
        appDelegate.handleLogout()
    }


    // MARK: - functions login

    func setupProfileUser(){
        if FIRAuth.auth()?.currentUser?.uid == nil{
            appDelegate.handleLogout()
        } else {

            let uid = FIRAuth.auth()?.currentUser?.uid
            //            imgView.layer.cornerRadius = imgView.frame.size.width/2
            //            imgView.clipsToBounds = true //carregar foto de perfil aqui

            databaseRef.child("Clients").child(uid!).observeSingleEvent(of: .value, with: { (snapshot) in
                if let dict = snapshot.value as? [String: AnyObject]{
                    //self.algumlabel.text = dict["username"] as? String carregar id e dados aqui
                    if let profileImageURL = dict["pic"] as? String{
                        let url = URL(string: profileImageURL)
                        URLSession.shared.dataTask(with: url!, completionHandler: {(data,response,error)in
                            if error != nil{
                                print(error!)
                                return
                            }
                            DispatchQueue.main.async {
                                //self.imgView?.image = UIImage(data: data!) //carregar img aqui
                            }
                        }).resume()
                    }
                }
            })
            self.appDelegate.handleLogin()
        }
    }

    func setupProfileAdm(){
        if FIRAuth.auth()?.currentUser?.uid == nil{
            appDelegate.handleLogout()
        } else {

//            let uid = FIRAuth.auth()?.currentUser?.uid
//            //            imgView.layer.cornerRadius = imgView.frame.size.width/2
//            //            imgView.clipsToBounds = true //carregar foto de perfil aqui
//
//            databaseRef.child("Clients").child(uid!).observeSingleEvent(of: .value, with: { (snapshot) in
//                if let dict = snapshot.value as? [String: AnyObject]{
//                    //self.algumlabel.text = dict["username"] as? String carregar id e dados aqui
//                    if let profileImageURL = dict["pic"] as? String{
//                        let url = URL(string: profileImageURL)
//                        URLSession.shared.dataTask(with: url!, completionHandler: {(data,response,error)in
//                            if error != nil{
//                                print(error!)
//                                return
//                            }
//                            DispatchQueue.main.async {
//                                //self.imgView?.image = UIImage(data: data!) //carregar img aqui
//                            }
//                        }).resume()
//                    }
//                }
//            })
            self.appDelegate.handleLogin()
        }
    }


}