"print array in main thread swift3 Xcode 8" - arrays

Question

I learn swift not long ago and i have some problem in this code print array:
class InitController: UIViewController {
public var initdata = [(id: String, name: String)]()
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
print("initdata", initdata)
init_auth()
}
func init_auth(){
let json: [String: Any] = ["token": UserDefaults.standard.value(forKey: "token"), "id":UserDefaults.standard.value(forKey: "id")]
//let jsonData = try? JSONSerialization.data(withJSONObject: json)
let jsonData = try? JSONSerialization.data(withJSONObject: json)
let url = "http://some_ip/api"
var request = URLRequest(url: URL(string: url)!)
request.httpMethod = "POST"
request.httpBody = jsonData
request.addValue("application/json", forHTTPHeaderField: "Content-Type")
request.addValue("application/json", forHTTPHeaderField: "Accept")
//print(jsonData)
let task = URLSession.shared.dataTask(with: request) { data, responce, error in guard let data = data, error == nil else {
print(error?.localizedDescription ?? "No data")
return
}
let responceJSON = try? JSONSerialization.jsonObject(with: data, options: [])
if let responceJSON = responceJSON as? [String: Any]{
let s = responceJSON["specialities"] as? NSDictionary
let d = s?["items"] as! NSArray
for i in d {
let f = i as? NSDictionary
self.initdata.append((id: f?["id"] as! String, name: f?["name"] as! String))
}
}
}
print("list", self.initdata)
task.resume()
}
}
initdata is empty array, but I get some json file and append this array. I try print initdata, but this array is nil. I think maybe problem in thread, but I don't know how realize this.

Answer 1

Try this -
func init_auth(){
let json: [String: Any] = ["token": UserDefaults.standard.value(forKey: "token"), "id":UserDefaults.standard.value(forKey: "id")]
//let jsonData = try? JSONSerialization.data(withJSONObject: json)
let jsonData = try? JSONSerialization.data(withJSONObject: json)
let url = "http://some_ip/api"
var request = URLRequest(url: URL(string: url)!)
request.httpMethod = "POST"
request.httpBody = jsonData
request.addValue("application/json", forHTTPHeaderField: "Content-Type")
request.addValue("application/json", forHTTPHeaderField: "Accept")
//print(jsonData)
let task = URLSession.shared.dataTask(with: request) { data, responce, error in guard let data = data, error == nil else {
print(error?.localizedDescription ?? "No data")
return
}
let responceJSON = try? JSONSerialization.jsonObject(with: data, options: [])
if let responceJSON = responceJSON as? [String: Any]{
let s = responceJSON["specialities"] as? NSDictionary
let d = s?["items"] as! NSArray
for i in d {
let f = i as? NSDictionary
self.initdata.append((id: f?["id"] as! String, name: f?["name"] as! String))
}
print("list", self.initdata)
}
}
task.resume()
}