refresh UItableview - ios

Question

The orders are being stored as Order objects: let orders = [Order]()
The idea is to call my API every second and when a new cell is created, the table should show the new cell.
var timer = Timer.scheduledTimer(timeInterval: 0.4, target: self, selector: "GetOrders", userInfo: nil, repeats: true)
this code does refresh my function to get data but repeats the cell !!
so in the beginning of GetOrders function I erase the array then upload it with new array from API.
func GetOrders (){
orders = []
but the code crushes when the new order is deleted from database. it shows int he table. When I click on it to returns ' index out of range' because of this function
func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
tableView.deselectRow(at: indexPath, animated: true)
let order = orders[indexPath.row]
guard orders.count > indexPath.row else {
print("Index out of range")
return
}
let storyboard = UIStoryboard(name: "Main", bundle: nil)
var viewController = storyboard.instantiateViewController(withIdentifier: "viewControllerIdentifer") as! OrderDetailsController
viewController.passedValue = order.id
self.present(viewController, animated: true , completion: nil)
}
UPDATE
func GetOrders (){
orders = []
print("hi")
let urlStr = "api/orders"
let url = URL(string: urlStr)
let user = "api"
let password = "Apipass"
var headers: HTTPHeaders = [
"Authorization": "Basic YXBpdXNlcjpBcGlBdXRoUGFzczIwMTchQCM="
]
Alamofire.request(url!, method: .get ,encoding: URLEncoding.default, headers: headers).responseJSON { response in
if let value: AnyObject = response.result.value as AnyObject? {
//Handle the results as JSON
let data = JSON(value)
for (key,subJson):(String, JSON) in data[0] {
//Do something you want
let logo = subJson["family"]["logo"]
let logoString = "img/\(logo)"
if let date = subJson["family"]["updated_at"].string {
print(date)
if let cleintName = subJson["client"]["name"].string {
let info = Order(shopname: shopname, shopaddress: shopaddr, clientName: cleintName, ClientAddress: clientAddres, PerferTime: time, Cost: subtotal , date : time , Logo : logoString ,id : id)
self.orders.append(info)
}
self.tableview.reloadData()
}
}

Answer 1

Have you tried going on the mainthread?
DispatchQueue.main.async {
self.tableView.reloadData()
}