Swift appended items are not saved - arrays

Question

Here, I declare myArray.
class AcikIlanlarViewController: UIViewController, UITableViewDelegate, UITableViewDataSource {
var myArray: [String] = []
Here, I call the function loadPage which modifies the array.
override func viewDidLoad() {
loadPage()
//when printed here myArray is nil
...
func loadPage() {
...
Alamofire.request(url, method: .get, parameters: parameters, encoding: JSONEncoding.default)
.validate { request, response, data in
...
let databases = try JSONDecoder().decode(responseData.self,from: json)
...
for i in 0...databases.orders.count-1 {
myArray.append(databases.orders[i].header!)
}
// when printed here I see the append has worked and myArray is not empty
}
As explained in comments, in viewDidLoad I call loadPage that appends certain stuff in myArray. Just after the append, I can see appended items. However, in viewDidLoad, just after the call to loadPage, myArray turns out to be empty. Why it is not saved?

Answer 1

Reload the table after the for loop
for i in 0...databases.orders.count-1 {
myArray.append(databases.orders[i].header!)
}
self.tableView.reloadData()

Answer 2

loadPage() calls an asynchronous method, so the func will finish before the operation is completed. Mostly, funcs that call async methods should have a completion handler…
override func viewDidLoad() {
loadPage {
self.tableView.reloadData()
}
}
func loadPage(completion: () -> Void) {
Alamofire.request(url, method: .get, parameters: parameters, encoding: JSONEncoding.default).validate { request, response, data in
let databases = try JSONDecoder().decode(responseData.self,from: json)
for i in 0...databases.orders.count-1 {
myArray.append(databases.orders[i].header!)
}
completion()
}
}