swift 4 Empty UITableView before UIRefeshControl - swift

Question

Good day, guys!
I have a little problem with updating data.
I'm getting information from backend with JSON-RPC and populating my table view cells.
I implemented UIRefreshContol to my TableView, so now when I pull to refresh it gives me the new information on top of old one.
So I have a list of products and when I add some products and refresh tableView to get updated information, tableView gives me old info AND new one on top of the old one
Are there any ways to empty table before I will get updated information from JSON?
// That's my JSON
func getJSONresponse() {
getResponse(o_method: "search_read", o_model: "res.users", o_domain:[["id", "=", jkID]], o_fields: ["name","partner_id"]) { (result) -> () in
//print(result)
if result != JSON.null {
let partner_id = result[0]["partner_id"][0].int!
getResponse(o_method: "search_read", o_model: "res.partner", o_domain: [["id", "=", partner_id]], o_fields: ["name", "kato"], completion: { (result)->() in
//print(result)
let id = result[0]["kato"][0].int!
katoID = id
print("adiasodjasoid",katoID)
getResponse(o_method: "search_read", o_model: "property.building", o_domain: [], o_fields: ["name","kato_area"], completion: { (result)->() in
result.forEach({ (temp) in
var area:String = "", name:String = "", totID: Int = 0
if (temp.1["kato_area"].string != nil) {
area = temp.1["kato_area"].string!
}
if (temp.1["name"].string != nil) {
name = temp.1["name"].string!
}
if (temp.1["id"].int != nil) {
totID = temp.1["id"].int!
}
let newModel = resUser(area: area, name: name, id: totID)
self.data.append(newModel)
})
DispatchQueue.main.async {
self.tableView.reloadData()
}
// print(self.data)
})
})
}
}
}
That's my Pull to refresh Function
#objc func refreshData() {
tableView.reloadData()
getJSONresponse()
self.tableView.contentInset = UIEdgeInsets(top: 80, left: 0, bottom: 0, right: 0)
DispatchQueue.main.asyncAfter(deadline: .now() + 3.0) {
self.refresher.endRefreshing()
self.tableView.contentInset = UIEdgeInsets.zero
self.tableView.setContentOffset(.zero, animated: true)
}
}

Answer 1

Well you will have to bind the UITableView with to an array, some may also refer to it to as datasource.
So basically heres the flow:
1) Create a mutable array/datasource (This will hold all the JSON).
2) Correspond UITableView number of rows method to return the count this array/datasource.
3) When you press the refresh. remove all the contents of the array/datasource (removeAll)
4) Once you receive the response from backend, add them to the array/datasource and call reloadData on UITableView object.
Hope That Helps. Code and Prosper!!

Answer 2

Please bind UITableView with an Array. Then update this Array first from the data that you are getting from JSON (Empty it and put in the new data), and then call UITableView reload.