EndLessScroll.swift

var isDataLoading = false
var orders = []
var startIndex = 0
var activityIndicator = UIActivityIndicatorView()


func loadMoreOrders() {
  //Get order from server handle your UI accordingly.
}

private func isLoadingIndexPath(_ indexPath: IndexPath) -> Bool {
        return indexPath.row == self.orders.count - 1
    }
    
    func tableView(_ tableView: UITableView, willDisplay cell: UITableViewCell, forRowAt indexPath: IndexPath) {
            handleEndLessScroll(indexPath)
    }
    
    func handleEndLessScroll(_ indexPath : IndexPath) {
        guard isLoadingIndexPath(indexPath) else {
            return
        }
        
        if !isDataLoading {
            activityIndicator = UIActivityIndicatorView(activityIndicatorStyle: .gray)
            activityIndicator.startAnimating()
            activityIndicator.frame = CGRect(x: CGFloat(0), y: CGFloat(0), width: allOrdersTableV.bounds.width, height: CGFloat(44))
            
            self.tableview.tableFooterView = activityIndicator
            self.tableview.tableFooterView?.isHidden = false
            
            isDataLoading = true
            startIndex = orders.count
            self.loadMoreOrders()
            
        }
    }