var chosenUserArray = [String]()

 //doneBtn只有在選到才會出現所以要做處理
   override func viewWillAppear(_ animated: Bool) {
        super.viewWillAppear(animated)
        doneBtn.isHidden = true
    }

    func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
        guard let cell = tableView.dequeueReusableCell(withIdentifier: "userCell") as? UserCell else {return UITableViewCell()}
        let profileImage = UIImage(named: "defaultProfileImage")
        //chosenUserArray有被選到就打勾
        if chosenUserArray.contains(emailArray[indexPath.row]){
                 cell.configureCell(profileImage: profileImage!, email: emailArray[indexPath.row], isSelected: true)
        }else{
             cell.configureCell(profileImage: profileImage!, email: emailArray[indexPath.row], isSelected: false)
        }

        //還有email的部分emailArray[indexPath.row]
        return cell
    }

    //被選到就要被加到groupMemberLbl，然後要去mainstoryboard改成minimum font scale
    func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
        guard let cell = tableView.cellForRow(at: indexPath) as? UserCell else {return}
        if chosenUserArray.contains(cell.emailLbl.text!){
            chosenUserArray.append(cell.emailLbl.text!)
            groupMemberLbl.text = chosenUserArray.joined(separator: ", ")
            doneBtn.isHidden = false
        }else{
            chosenUserArray = chosenUserArray.filter({ $0 != cell.emailLbl.text!})
            if chosenUserArray.count >= 1 {
                groupMemberLbl.text = chosenUserArray.joined(separator: ", ")
            }else{
                groupMemberLbl.text = "add people to your group"
                doneBtn.isHidden = true
                }
            }
        }
    }