DataSources.swift

// OrderDataSource.swift
class OrderDataSource: NSObject, UITableViewDataSource {
    
    fileprivate let data: [OrdersViewModel] = [
        OrdersViewModel(model: Order(name: "Order - 1", description: "Description - 1", price: 100)),
        OrdersViewModel(model: Order(name: "Order - 2", description: "Description - 2", price: 200)),
        OrdersViewModel(model: Order(name: "Order - 3", description: "Description - 3", price: 300)),
        OrdersViewModel(model: Order(name: "Order - 4", description: "Description - 4", price: 400)),
        OrdersViewModel(model: Order(name: "Order - 5", description: "Description - 5", price: 500))
    ]
    
    func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
        return data.count
    }
    
    func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
        let cell = tableView.dequeueReusableCell(withIdentifier: "cell", for: indexPath)
        let model = data[indexPath.row]
        cell.textLabel?.text = model.title
        return cell
    }
}

// CompletedOrdersDataSource.swift
class CompletedOrdersDataSource: NSObject, UITableViewDataSource {
    fileprivate let data: [CompletedOrderViewModel] = [
        CompletedOrderViewModel(model: CompletedOrder(name: "Completed order 1", description: "This order completed", completedDate: "19/10/2017", userRating: 5.0, price: 1240)),
        CompletedOrderViewModel(model: CompletedOrder(name: "Completed order 2", description: "This order completed", completedDate: "10/09/2017", userRating: 1.0, price: 900))
    ]

    func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
        return data.count
    }
    
    func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
        let cell = tableView.dequeueReusableCell(withIdentifier: "cell", for: indexPath)
        let completedOrderModel = data[indexPath.row]
        cell.textLabel?.text = completedOrderModel.title
        return cell
    }
}