Getting Cell Count after network operation - ios

Question

I am trying to get the collectionViewCell count from the network request but the value turns out to be always 0 (to which I initialised the count variable) I want the view to load the cells after I get it's count from the get request.What is it I'm doing wrong I have written this code after super.viewDidLoad().
DispatchQueue.global(qos:.background).async {
let token = "---------------------------"
let url = URL(string: "https:----------home.json?token="+token)!
let task = URLSession.shared.dataTask(with: url) {(data, response, error) in
guard let data = data else { return }
// print(String(data: data, encoding: .utf8)!)
let jsonWithObjectRoot = try? JSONSerialization.jsonObject(with: data, options: [])
// print(json!)
if let dictionary = jsonWithObjectRoot as? [String: Any] {
if let data = dictionary["data"] as? [String:Any]{
if let posts = data["posts"] as? [Any]{
count = posts.count
//print(count) //the value here is 2
for object in posts{
if let contentString = object as? [String: Any] {
print(contentString["title"] as! String)
// print(contentString["entered"]as! String)
}
}
}
}
}
}
task.resume()
/* end Request */
DispatchQueue.main.async{
self.collectionView.reloadData()
self.collectionView.collectionViewLayout.invalidateLayout()
}
}

Answer 1

Classic async case. You network calls are async, so your reload should happen inside the completion of the network call.
DispatchQueue.global(qos:.background).async {
let token = "---------------------------"
let url = URL(string: "https:----------home.json?token="+token)!
let task = URLSession.shared.dataTask(with: url) {(data, response, error) in
guard let data = data else { return }
// print(String(data: data, encoding: .utf8)!)
let jsonWithObjectRoot = try? JSONSerialization.jsonObject(with: data, options: [])
// print(json!)
if let dictionary = jsonWithObjectRoot as? [String: Any] {
if let data = dictionary["data"] as? [String:Any]{
if let posts = data["posts"] as? [Any]{
count = posts.count
//print(count) //the value here is 2
DispatchQueue.main.async{
self.collectionView.reloadData()
self.collectionView.collectionViewLayout.invalidateLayout()
}
for object in posts {
if let contentString = object as? [String: Any] {
print(contentString["title"] as! String)
// print(contentString["entered"]as! String)
}
}
}
}
}
}
task.resume()
/* end Request */
}

Answer 2

You have to reload after getting data from the network
count = posts.count
//print(count) //the value here is 2
DispatchQueue.main.async{
self.collectionView.reloadData()
}