save username checkbox xamarin iOS font awesome

saveuser.cs

bool saveUserClick;

this.saveUserClick = true;

partial void BtnSaveUsername_TouchUpInside(UIButton sender)
        {
            if (saveUserClick == true)
            {
                saveUserClick = false;
                btnSaveUsername.SetTitle("Save Username ", UIControlState.Normal);
                btnSaveUsername.Font = UIFont.FromName("FontAwesome", 14);
            }
            else
            {

                saveUserClick = true;
                btnSaveUsername.SetTitle("Save Username ", UIControlState.Normal);
                btnSaveUsername.Font = UIFont.FromName("FontAwesome", 14);
            }


        }