In Swift, changing in function doesn't work in outside - json

Question

I have a tableview. cekilecek_data contains tableview datas. I get some datas from JSON and I want to append this datas to tableview. But I have to do this inside of jsonGetir(). However, it does not work. kodJSON and kodlarJSON are nil in viewDidLoad(). Also, cekilecek_data.append(kodJSON[1]) it doesn't add the datas to the table.
How do I fix it?
var cekilecek_data = ["Fenerbahçe", "Chelsea", "Arsenal"]
var kodlarJSON:String = ""
var kodJSON:[String] = []
func jsonGetir(){
let urls = NSURL(string: "http://gigayt.com/mackolik/deneme.php")
let sessions = NSURLSession.sharedSession().dataTaskWithURL(urls!){
data, response, error -> Void in
if (error != nil){ print(error) }
do {
if let jsonResult = try NSJSONSerialization.JSONObjectWithData(data!, options: []) as? NSDictionary {
kodlarJSON = jsonResult["kodlar"] as! String //101,102,103
kodJSON = kodlarJSON.componentsSeparatedByString(",")
cekilecek_data.append(kodJSON[1]) //Here doesn't work!
}
}
catch { print(error) }
}
sessions.resume()
}

Answer 1

Reload your tableview after you got data from server this way:
dispatch_async(dispatch_get_main_queue()) {
self.tableView.reloadData()
}
And your final code will be:
func jsonGetir(){
let urls = NSURL(string: "http://gigayt.com/mackolik/deneme.php")
let sessions = NSURLSession.sharedSession().dataTaskWithURL(urls!){
data, response, error -> Void in
if (error != nil){ print(error) }
do {
if let jsonResult = try NSJSONSerialization.JSONObjectWithData(data!, options: []) as? NSDictionary {
self.kodlarJSON = jsonResult["kodlar"] as! String //101,102,103
self.kodJSON = self.kodlarJSON.componentsSeparatedByString(",")
self.cekilecek_data.append(self.kodJSON[1]) //Here doesn't work!
}
dispatch_async(dispatch_get_main_queue()) {
self.tableView.reloadData() //Reload tableview here.
}
}
catch { print(error) }
}
sessions.resume()
}

Answer 2

With kodJSON = kodlarJson.componentsseparatedByString(",") you are creating an Array of only one object. Then with cekilecke_data.append(kodJSON[1]) you are trying to append your data with the second object from this array that you have only set one object to.
do {
if let jsonResult = try NSJSONSerialization.JSONObjectWithData(data!, options: []) as? NSDictionary {
kodlarJSON = jsonResult["kodlar"] as! String
kodJSON = kodlarJSON.componentsSeparatedByString(",")
// this line sets kodJSON:[String] to ["kodlar"]
cekilecek_data.append(kodJSON[1]) //Here doesn't work!
// this tries to append cekilecek_data from index [1] or second slot of kodJSON which only has one entry
}
}
if you change line to kodlarJSON = jsonResult["kod,lar"] as! String, it would work because kodJSON[1] would equal "lar"