the error of "failed to obtain a cell from its dataSource "

testTableView

import UIKit
import Alamofire

class OrderListTableViewController: UITableViewController {
    
    var orderNameList = ["jack", "ken", "howard"]
    var orderLandlordNameList = ["ord1", "ord2", "ord3"]
    var orderDurationList = ["1~2", "3~4", "5~6"]
    var orderStatusList = ["new", "old", "change"]
    var result = " "
    var orderListHeaderView: OrderListHeaderView!
    var orderUnconfirmHeaderView: OrderUnconfirmHeaderView!
//    var orderResult: AnyObject!
    var orderResult: [[String:AnyObject]]?
    var orderType: String!
    var hostId : String? = nil
    var hostSecret : String? = nil
    var hostEmail : String = ""
    var LID : String? = nil
    var orderToken = " "
    var orderAmount : Int = 0
    
    override func viewDidLoad() {
        super.viewDidLoad()
        
        // Config the table view style
        tableView.allowsSelection = false
        tableView.separatorStyle = .none
        
        // Start spinner
        ActivityIndicatorHelper.shared.showActivityIndicator(view: self.view)
        
        print("type: \(self.orderType)")
        
        // Display Dynamic Navigation Title 
//        self.navigationItem.title = self.orderType

        if (UserDefaults.standard.value(forKey: "hostId") as! String?) != nil{
            self.hostId = UserDefaults.standard.value(forKey: "hostId") as? String
        }
        
        if (UserDefaults.standard.value(forKey: "hostSecret") as! String?) != nil{
            self.hostSecret = UserDefaults.standard.value(forKey: "hostSecret") as? String
        }
        
        if (UserDefaults.standard.value(forKey: "hostEmail") as! String?) != nil{
            self.hostEmail = (UserDefaults.standard.value(forKey: "hostEmail") as? String)!
        }
        
        if (UserDefaults.standard.value(forKey: "genericAccessToken") as! String?) != nil{
            self.orderToken = (UserDefaults.standard.value(forKey: "genericAccessToken") as! String?)!
        } else {
            self.orderToken = " "
        }
        
        print("test orderToken: \(self.orderToken)")
        print("test!! host id id id mode: \(self.hostId)")
        
        var appRefreshToken : String? = nil
        if (UserDefaults.standard.value(forKey:"appRefreshToken") as! String?) != nil{
            appRefreshToken = UserDefaults.standard.value(forKey:"appRefreshToken") as? String
        }
        
        /* NOTE:
         1.If the genericAccessToken in the userDefault, and it is not expired, then there is no
         need to request a new access token by refresh token, because refresh token is One Time Token
         it will be delete after request new access token
         2.If genericAccessToken is expired then request a new access token if login clientSecret token is alive.
         
         Token check result:
         1 == Token expired
         2 == Token still alive
         3 == No data in access_token table
         4 == Check fail, type is null
         */
        let tokenCheck = TokenManager(hostID: self.hostId!)
        
        tokenCheck.isTokenExpried(token: self.orderToken, type: "access") { result, error in
            switch result! {
            case 1: // token expired, if clientSecret token is alive, then request new genericAccessToken and it's new refresh token
                print(" access token expired checkresult = \(result); error = \(error)")
                tokenCheck.isTokenExpried(token: self.hostSecret!, type: "refresh") { result, error in
                    if(result == 2){ // hostSecret token is alive
                        tokenCheck.isTokenExpried(token: appRefreshToken!, type: "refresh") { result, error in
                            switch result! {
                            case 2: // refresh token alive
                                print("STAGE3-1 appRefreshToken checkresult = \(result); error = \(error)")
                                let tokenManager = TokenManager(hostID: self.hostId!)
                                
                                // Get the genericAccessToken to save to userDefault
                                tokenManager.getAccessToken(byRefreshToken: (appRefreshToken! as AnyObject) as! String, hostSecret: (self.hostSecret! as AnyObject) as! String, scope: "scope_get"){ responseObject, error in
                                    print("responseObject genericAccessToken!!!!! = \(responseObject); error = \(error)")
                                    self.orderToken = responseObject!
                                    self.getOrderListByAccessToken(token: self.orderToken, startVal: "", endVal: "", bnbSelect: 0, sortTypeVal: "", orderNum: "")
                                }
                            default:
                                // IMPORTANT NOTE!!!:
                                // result 1 (expired) and 3 (token not on DB) are not possiable, because every time access token expired, app will
                                // request a new access token and new refresh token if login clientSecret token is alive
                                print("result 1 (expired) and 3 (token not on DB) are not possiable")
                                print("appRefreshToken checkresult!!!! = \(result); error = \(error)")
                            }
                        }
                    } else {
                        // hostSecret is belong to refresh token, user will be log out if hostSecret is not alive, regardless of other status
                        
                        // Logout action request to API remove data on DB
                        let tokenWorks = TokenManager(hostEmail: self.hostEmail)
                        tokenWorks.removeAllKeyDataTokens()
                        
                        // Display alert message with confirmation
                        let myAlert = UIAlertController(title: "貼心提醒", message: "主人您的自動登入權限已到期，請重新登入，謝謝!", preferredStyle: UIAlertControllerStyle.alert);
                        
                        print("print view stacks \(self.navigationController?.viewControllers)")
                        
                        // Go to login view
                        let okAction = UIAlertAction(title: "OK", style: UIAlertActionStyle.default){ action in
                            let sb = UIStoryboard(name: "Main", bundle:nil)
                            let initView = sb.instantiateViewController(withIdentifier: "ViewController") as! ViewController
                            let loginView = sb.instantiateViewController(withIdentifier: "LoginViewController") as! LoginViewController
                            
                            let newVC : [UIViewController] = [initView, loginView]
                            self.navigationController?.viewControllers = newVC
                            print("new print view stacks \(self.navigationController?.viewControllers)")
                            _ = self.navigationController?.popToViewController(self.navigationController!.viewControllers[1], animated: true)
                        }
                        
                        myAlert.addAction(okAction);
                        
                        self.present(myAlert, animated: true, completion: nil);
                    }
                }
            case 2: // token still alive
                print(" access token still alive checkresult = \(result); error = \(error)")
                self.getOrderListByAccessToken(token: self.orderToken, startVal: "", endVal: "", bnbSelect: 0, sortTypeVal: "", orderNum: "")
            default:
                print(" access token checkresult = \(result); error = \(error)")
            }
        }
        
        print("test!! appRefreshToken mode: \(appRefreshToken)")

        if(self.orderType != "unconfirm"){
        
            self.orderListHeaderView = Bundle.main.loadNibNamed("OrderListHeaderView", owner: self, options: nil)![0] as! OrderListHeaderView
            
            tableView.tableHeaderView = orderListHeaderView
            
        } else {
            self.orderUnconfirmHeaderView = Bundle.main.loadNibNamed("OrderUnconfirmHeaderView", owner: self, options: nil)![0] as! OrderUnconfirmHeaderView
            
            tableView.tableHeaderView = orderUnconfirmHeaderView
        }

        // Uncomment the following line to preserve selection between presentations
        // self.clearsSelectionOnViewWillAppear = false

        // Uncomment the following line to display an Edit button in the navigation bar for this view controller.
        // self.navigationItem.rightBarButtonItem = self.editButtonItem()
        
//        print("view contriller stacks:::: \(self.navigationController!.viewControllers)")
    }
    
    override func viewWillAppear(_ animated: Bool) {
        super.viewWillAppear(true)
        
        // TODO: orderToken must check is expired or not, if it is expired and login token is not expired, then renew a new order token to it.
        self.getOrderListByAccessToken(token: self.orderToken, startVal: "", endVal: "", bnbSelect: 0, sortTypeVal: "", orderNum: "")
    }

    @IBAction func searchBarTapped(sender: AnyObject) {
        print("Click the search tap")
        
        self.performSegue(withIdentifier: "searchView", sender: nil)
        
    }
    
    // NOTE: Passing data by button in the cell is a very important skill
    @IBAction func orderDetailButtonTapped(sender: AnyObject) {
        
        // For a button press
        let button = sender as! UIButton
        let indexPath = self.tableView.indexPathForView(view: button)!
        let ordNumber = self.orderResult![indexPath.row]["ordID"] as? String
        let ordArr : [String] = [ordNumber!, self.orderType]
        print("Click the order detail view indexPath: \(ordArr)")
        
        if(self.orderType == "unconfirm"){
            self.performSegue(withIdentifier: "unconfirmDetailView", sender: ordArr)
        } else {
            self.performSegue(withIdentifier: "orderDetailView", sender: ordArr)
        }
    }
    
    func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
        if let identifier = segue.identifier {
            switch identifier {
            case "searchView":
                if let vc = segue.destination as? OrderSearchViewController {
                    vc.orderListTableViewController = self
                    print(" order type!!!!!!!: \(self.orderType) ")
                    vc.orderTitle = self.orderType!
                }
            case "orderDetailView":
                if let vc = segue.destination as? OrderDetailTableViewController {
                    vc.ordArr = sender as? Array
                }
            case "unconfirmDetailView":
                if let vc = segue.destination as? OrderUnconfirmDetailViewController{
                    vc.ordArr = sender as? Array
                }
            default: break
            }
        }
    }

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

    // MARK: - Table view data source

    func numberOfSectionsInTableView(tableView: UITableView) -> Int {
        // #warning Incomplete implementation, return the number of sections
        return 1
    }

    override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
        // #warning Incomplete implementation, return the number of rows
        guard var orderCount = self.orderResult?.count else {
            return 0
        }
        
        if(orderCount == 0){
            orderCount = 1
        }

        print("orderResult count! : \(self.orderResult?.count)")
        print("orderCount! : \(orderCount)")
        
        return orderCount
    

    }

    func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
        print("test indexPath::: \(indexPath)")
        if self.orderResult?.count == 0 {
            
            let cellIdentifier = "Cell2"
            let cell = tableView.dequeueReusableCell(withIdentifier: cellIdentifier, for: indexPath as IndexPath) as! OrderListTableViewCell
            
            cell.noOrderRemind?.text = "無任何訂單可查看\n建議設定其他篩選條件以利查詢"
            
            return cell
        } else {
            let cellIdentifier = "Cell"
            let cell = tableView.dequeueReusableCell(withIdentifier: cellIdentifier, for: indexPath as IndexPath) as! OrderListTableViewCell
            
            print("i need to bebug::: \(orderResult?[indexPath.row])")
            
            let orderResultRow = orderResult?[indexPath.row]
            
            if let checkInStartDate = orderResultRow?["ordSDate"] as? String, let checkInEndDate = orderResultRow?["ordEDate"] as? String{
                
                let checkDuration =  "入住期間： " + "\(checkInStartDate) ~ \(checkInEndDate)"
                
                // Configure the cell...
                cell.nameLabel?.text = orderResultRow?["ordUName"] as? String
                cell.landlordName?.text = orderResultRow?["ordRoomType"] as? String
                cell.checkInDuration?.text = checkDuration
                cell.orderStatus?.text = ""
            }
            
            return cell
        }
    }
    
    func completeSearchView(data: [String: AnyObject?]) {
        print(data["orderTypeBack"] as Any)
        print(data["startVal"] as Any)
        print(data["endVal"] as Any)
        print(data["bnbSelectVal"] as Any)
        print(data["sortTypeVal"] as Any)
        print(data["orderNumber"] as Any)
        
//        var orderTypeBack = data["orderTypeBack"] as? String
        let startVal = data["startVal"] as? String
        let endVal = data["endVal"] as? String
        let bnbSelectVal = data["bnbSelectVal"] as? Int
        let sortTypeVal = data["sortTypeVal"] as? String
        let orderNumber = data["orderNumber"] as? String
        
        self.orderType = data["orderTypeBack"] as? String
        
        self.getOrderListByAccessToken(token: self.orderToken, startVal: startVal!, endVal: endVal!, bnbSelect: bnbSelectVal!, sortTypeVal: sortTypeVal!, orderNum: orderNumber!)

        
    }
    
    func getOrderListByAccessToken(token: String, startVal: String, endVal: String, bnbSelect: Int, sortTypeVal: String, orderNum: String){
        
        let orderToken = token
        
        let urlComponents = NSURLComponents(string: "\(Constants.API.URL)/oauth2/orders_list")!
        
        let searchType : Int
        let ordStatus : Int
        let startVal : String = startVal
        let endVal : String = endVal
        let bnbSelect : Int = bnbSelect
        let sortTypeVal : String = sortTypeVal
        let orderNum : String = orderNum
        var lang : String
        
        switch self.orderType {
        case "paid" :
            // Checked No problem
            searchType = 2
            ordStatus = 1
            lang = "cn"
        case "unpay" :
            // Checked No problem
            searchType = 2
            ordStatus = 3
            lang = "cn"
        case "cancel" :
            // Checked No problem
            searchType = 2
            ordStatus = 2
            lang = "cn"
        case "reject" :
            // Checked No problem, but when start and end has value still need to check the sql is right or not
            searchType = 2
            ordStatus = 4
            lang = "cn"
        case "unconfirm" :
            //
            searchType = 2
            ordStatus = 5
            lang = "cn"
        default:
            searchType = 2
            ordStatus = 0
            lang = "cn"
        }
        
        print("searchType: \(searchType)")
        
        print("ordStatus: \(ordStatus)")
        
        print("startVal: \(startVal)")
        
        print("endVal: \(endVal)")
        
        urlComponents.queryItems = [
            NSURLQueryItem(name: "searchType", value: String(searchType)) as URLQueryItem,
            NSURLQueryItem(name: "ordStatus", value: String(ordStatus)) as URLQueryItem,
            NSURLQueryItem(name: "startVal", value: String(startVal)) as URLQueryItem,
            NSURLQueryItem(name: "endVal", value: String(endVal)) as URLQueryItem,
            NSURLQueryItem(name: "bnbSelect", value: String(bnbSelect)) as URLQueryItem,
            NSURLQueryItem(name: "sortTypeVal", value: String(sortTypeVal)) as URLQueryItem,
            NSURLQueryItem(name: "orderNum", value: String(orderNum)) as URLQueryItem,
            
            NSURLQueryItem(name: "lang", value: String(lang)) as URLQueryItem
        ]
        
        let URL = urlComponents.url
        
        
        var mutableURLRequest = URLRequest(url: URL!)
        
        mutableURLRequest.httpMethod = "GET"
        
        mutableURLRequest.setValue("Bearer \(orderToken)", forHTTPHeaderField: "Authorization")
        
        Alamofire.request(mutableURLRequest).responseJSON{ response in
            switch response.result {
            case .success(let data):
                let json = data
                print("debug json!!!!! \(json)")
                DispatchQueue.main.async(execute: {
                    let orderInfoJSON = (json as AnyObject).object(forKey: "ordInfo")
                    print(" json info order count: \((orderInfoJSON! as AnyObject).count)")
                    self.orderAmount = (orderInfoJSON! as AnyObject).count
                    if(self.orderType != "unconfirm"){
                        self.orderListHeaderView.orderAmount.text = "訂單數量： \(self.orderAmount)"
                    } else {
                        self.orderUnconfirmHeaderView.orderAmount.text = "訂單數量： \(self.orderAmount)"
                    }
                    
//                    print("debug!!!!! \(orderInfoJSON)")
                    self.orderResult = orderInfoJSON as? [[String:AnyObject]]
                    
                    // stop spinner when download is done
                    ActivityIndicatorHelper.shared.hideActivityIndicatorView()
                    
                    self.tableView.reloadData()
                    
                })
            case .failure(let error):
                print("wangdu test faile alert message: \(error)")
                Helper.displayAlertMessage(hostMessage: "無法獲得訂單資料，\n請檢查是否網路連線正常！", targetClass: self)
            }
            
        }
        
    }

}

// MARK: - UITableView
extension UITableView {
    func indexPathForView (view : UIView) -> NSIndexPath? {
        let location = view.convert(CGPoint.zero, to:self)
        return indexPathForRow(at: location) as NSIndexPath?
    }
}