private void EmailCheck(object o, EventArgs e)
        {
            UIView.Animate(0.25, () => {
                EmailConstraint.Active       = true;
                ConstraintToSuperview.Active = false;
                EmailTableCell.LayoutIfNeeded();

                EmailLabel.Alpha  = 1;
                EmailLabel.Hidden = false;
            });

            var pattern    = @"^(?("")(""[^""]+?""@)|(([0-9a-z]((\.(?!\.))|[-!#\$%&'\*\+/=\?\^`\{\}\|~\w])*)(?<=[0-9a-z])@))" + @"(?(\[)(\[(\d{1,3}\.){3}\d{1,3}\])|(([0-9a-z][-\w]*[0-9a-z]*\.)+[a-z0-9]{2,17}))$";
            var emailCheck = new Regex(pattern);

            if (emailCheck.IsMatch(EmailTextField.Text))
            {
                _currentProfileModelChanges.Email = EmailTextField.Text.Trim();
                WrongEmailErrorImage.Hidden       = true;
                _isChanged = true;
            }
            else
            {
                WrongEmailErrorImage.Hidden = false;
            }
        }
        public override void ViewDidLoad()
        {
            base.ViewDidLoad();
            NavigationController.NavigationBar.Items[0].Title = "Profile";

            _currentProfileModelChanges = new UserProfileModel();

            WrongEmailErrorImage.Image    = UIImage.FromBundle("ErrorIcon");
            WrongPasswordErrorImage.Image = UIImage.FromBundle("ErrorIcon");

            EmailTextField.Text    = AppSettingsManager.Email;
            PasswordTextField.Text = AppSettingsManager.Password;

            ConstraintToSuperview.Active = false;

            EmailTextField.EditingDidBegin += (o, e) => {
                EmailConstraint.Active       = false;
                ConstraintToSuperview.Active = true;
                UIView.Animate(0.25,
                               () => {
                    EmailConstraint.Active       = false;
                    ConstraintToSuperview.Active = true;

                    EmailTableCell.LayoutIfNeeded();

                    EmailLabel.Alpha = 0;
                });
                EmailLabel.Hidden = true;
            };

            EmailTextField.EditingDidEnd += EmailCheck;

            PasswordTextField.EditingDidEnd += (o, e) => {
                if (PasswordTextField.Text.Length >= 8)
                {
                    _currentProfileModelChanges.Password = PasswordTextField.Text;
                    WrongPasswordErrorImage.Hidden       = true;
                    _isChanged = true;
                }
                else
                {
                    WrongPasswordErrorImage.Hidden = false;
                }
            };

            View.AddGestureRecognizer(new UITapGestureRecognizer(() => { View.EndEditing(true); }));
        }