append is not working - json

Question

I have parsed a json string and i want to use it in a tableview. when i try to append the json string into an array the append method is not working. Here is the code that i have used. Can anyone help me with this?
import UIKit
class ViewController: UIViewController, UITableViewDataSource, UITableViewDelegate {
#IBOutlet weak var tableView: UITableView!
var userName = [String]()
override func viewDidLoad() {
super.viewDidLoad()
tableView.delegate = self
tableView.dataSource = self
// 1
let urlAsString = "http://demo.codeofaninja.com/tutorials/json-example-with-php/index.php"
let url = NSURL(string: urlAsString)!
let urlSession = NSURLSession.sharedSession()
//2
let jsonQuery = urlSession.dataTaskWithURL(url, completionHandler: { data, response, error -> Void in
if (error != nil) {
print(error!.localizedDescription)
}
// 3
do {
let jsonResult = try NSJSONSerialization.JSONObjectWithData(data!, options: NSJSONReadingOptions.MutableContainers) as! NSDictionary
/*let err: NSError!
if (err != nil) {
print("JSON Error \(err.localizedDescription)")
}*/
// 4
//let fname: String! = jsonResult["firstname"] as! String
//let lname: String! = jsonResult["lastname"] as! String
//let usrname: String! = jsonResult["username"] as! String
dispatch_async(dispatch_get_main_queue(), {
if let users = jsonResult.objectForKey("Users") as? [[String:AnyObject]]
{
for user in users
{
print("First Name:")
print(user["firstname"]!)
print("Last Name:")
print(user["lastname"]!)
print("User Name:")
let nameUser = user["username"]! as! String
print(nameUser)
self.userName.append(nameUser)
print("***************")
}
}
//print(jsonResult["Users"]!)
//print(lname)
//print(usrname)
})
}
catch {
print("error");
}
})
jsonQuery.resume()
//self.userName.append("ganesh")
// 5
print(userName)
}
func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return userName.count
}
func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCellWithIdentifier("cell") as UITableViewCell!
cell.textLabel?.text = userName[indexPath.row]
return cell
}
func tableView(tableView: UITableView, commitEditingStyle editingStyle: UITableViewCellEditingStyle, forRowAtIndexPath indexPath: NSIndexPath) {
userName.removeAtIndex(indexPath.row)
tableView.deleteRowsAtIndexPaths([indexPath], withRowAnimation: .Automatic)
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
}

Answer 1

You are appending right in the array,Just call self.tableView.reloadData() to refresh table view at the end of dispatch to show the data in the tableView.

Answer 2

The append function works fine but you are filling the array in the background and never reloading the tableView when you have the data in the array
for user in users
{
if let nameUser = user["username"] as? String {
self.userName.append(nameUser)
}
}
self.tableView.reloadData()
Try this inside the if let users = jsonResult.objectForKey("Users") as? [[String:AnyObject]] block