How to import an array to the function tableViewControler - ios

Question

I am implementing a table view in tableViewController in a Swift project. I am creating two array from a json calling in viewDidLoad and everything in viewDidLoad function works great. here is my viewDidLoad function.
First the arrays and variables are like this:
var imageList = ["usaflag","gerflag","franceflag","jpflag","gerflag"]
var titleList = ["Croatian kuna","Hungarian forint","Congolese franc","Israeli Shekel","Nigerian naira"]
var descriptionList = ["HRK","HUF","CDF","ILS","NGN"]
var myCurrency:[String] = []
var myValues:[Double] = []
var aCheckEuro:Double = 0
var resultCurrency:Double = 0
var activeCurrency:Double = 0
var zeroOriginActiveCurrency:Double = 0
var oneDestActiveCurrency:Double = 0
var currencySelected:String = ""
var zeroOriginCurrencySelected:String = ""
var oneDestCurrencySelected:String = ""
and the viewDidLoad is here
override func viewDidLoad() {
super.viewDidLoad()
let url = URL(string: "http://data.fixer.io/api/latest?access_key=....")
let task = URLSession.shared.dataTask(with: url!) { (data, response, error) in
if (error != nil)
{
print("ERROR")
}
else
{
if let content = data
{
do
{
let myJson = try JSONSerialization.jsonObject(with: content, options: JSONSerialization.ReadingOptions.mutableContainers) as AnyObject
print(myJson)
if let rates = myJson["rates"] as? NSDictionary
{
for (key, value) in rates
{
self.myCurrency.append((key as! String))
self.myValues.append((value as? Double)!)
}
print(self.myCurrency)
print(self.myValues)
}
}
catch
{
}
}
}
}
task.resume()
}
as I said until here everything is working fine. these all are in a tableViewController . the problem is in this function
override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "Cell", for: indexPath) as! TableViewCell
// Configure the cell...
cell.cellTitle.text = titleList[indexPath.row]
cell.cellDescription.text = descriptionList[indexPath.row]
cell.cellImageView.image = UIImage(named : imageList[indexPath.row])
cell.currencyCount.text = myCurrency[indexPath.row] // here has fatal erroe
return cell
}
the last line
cell.currencyCount.text = myCurrency[indexPath.row]
has fatal error and I do not know how to solve it.I should mention that currencyCount is a label.

Answer 1

You Will Create one Array Like This :
var myCurrency:[String] = []
your Array is Empty for First TableView Load
there for you will write this code :
if myCurrency.isEmpty == false {
cell.currencyCount.text = myCurrency[1]
}
else
{
self.tableView.reloadData()
}
}

Answer 2

It may happen when the tableView loads and there is no data yet in myCurrency array due to the delay of the network call. It will throw an out-of-range exception. Also may you want to put tableView.reloadData right after your network call finishes. What is returning the method numberOfItems?
Update: There are somethings that you can do.
Below self.myValues.append((value as? Double)!) put
tableView.delegate = self
tableView.dataSource = self
In your cellForRowAt add a validation to check if array is empty:
if !myCurrency.isEmpty {
cell.currencyCount.text = myCurrency[indexPath.row]
}