Swift. Data is loaded after then TableView - swift

Question

I have 2 files. First - TransactionsViewController. Second - GetTransactions. When I open TransactionsViewController the table from that view loads faster than the date from GetTransactions. Therefore, it is displayed blank. How to fix it?
Here is the code of TransactionsViewController viewDidLoad:
override func viewDidLoad() {
super.viewDidLoad()
GetTransactions().getTransactions()
clientsCount = GetTransactions.transactions.count
setupNavBar()
createTable()
refreshSetup()
}
Here is the code of GetTransactions:
class GetTransactions {
static var transactionsArr = [[String : Any]]()
static var transactions = [TransactionInfo]()
let URL_GET_TRANSACTIONS = "https://mashkov.dev/sites/default/BankApp/Transactions/Transactions.php"
func getTransactions(){
GetTransactions.transactionsArr.removeAll()
AF.request(URL_GET_TRANSACTIONS).responseJSON{ (response) in
if (response.value as? [[String : Any]]) != nil {
GetTransactions.transactionsArr = response.value as! [[String : Any]]
}
self.convertData()
print(GetTransactions.transactions)
}
}
func convertData() {
GetTransactions.transactions.removeAll()
for transaction in GetTransactions.transactionsArr {
let cl = TransactionInfo(id: transaction["id"] as! String,
payee: transaction["payee_account_id"] as! String,
sender: transaction["sender_account_id"] as! String,
transDate: transaction["trans_date"] as! String,
amount: transaction["amount"] as! String,
isSuccessfully: Bool((transaction["isSuccessfully"] as! String)) ?? true)
GetTransactions.transactions.append(cl)
}
}
}

Answer 1

What you need is a closure / block to be passed as an argument
class GetTransactions {
static var transactionsArr = [[String : Any]]()
static var transactions = [TransactionInfo]()
let URL_GET_TRANSACTIONS = "https://mashkov.dev/sites/default/BankApp/Transactions/Transactions.php"
func getTransactions(completion block: () -> ()){
GetTransactions.transactionsArr.removeAll()
AF.request(URL_GET_TRANSACTIONS).responseJSON{ (response) in
if (response.value as? [[String : Any]]) != nil {
GetTransactions.transactionsArr = response.value as! [[String : Any]]
}
self.convertData()
print(GetTransactions.transactions)
block()
}
}
func convertData() {
GetTransactions.transactions.removeAll()
for transaction in GetTransactions.transactionsArr {
let cl = TransactionInfo(id: transaction["id"] as! String,
payee: transaction["payee_account_id"] as! String,
sender: transaction["sender_account_id"] as! String,
transDate: transaction["trans_date"] as! String,
amount: transaction["amount"] as! String,
isSuccessfully: Bool((transaction["isSuccessfully"] as! String)) ?? true)
GetTransactions.transactions.append(cl)
}
}
}
And you call it using,
GetTransactions().getTransactions {
clientsCount = GetTransactions.transactions.count
//reload your tableView here
}