SWIFT Data in Table View not showing - ios

Question

I need help on how to solve this problem.
I tried to fetch data using json but when I tried to view in Table View its not showing.
I used the code below to test if table view is working and it works!
// self.clientList = ["Mango", "Banana", "Orange", "Guava", "Grapes"]
I used the code below to test if there's data returned from json. Still it works.
for item in jsonClientList {
let firstName = item["firstName"]
//Printing is working
print(firstName as! String)
}
Line not working! I dont know why. Its inside of loop but to data upon loading the table view.
Thanks in advance.
self.clientList.append(firstName as! String)
//---------------------------------
var clientList:[String] = []
func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return self.clientList.count
}
func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
let cell: UITableViewCell = UITableViewCell(style: UITableViewCellStyle.Subtitle, reuseIdentifier: "tblClientList")
cell.textLabel?.text = self.clientList[indexPath.row]
return cell
}
internal func jsonParser() -> Void{
//-------------------------
let postEndpoint: String = "http://domain.com/client"
let url = NSURL(string: postEndpoint)
let session = NSURLSession.sharedSession()
session.dataTaskWithURL(url!, completionHandler:
{
(data: NSData?, response: NSURLResponse?, error: NSError?) -> Void in
do{
let ipString = NSString(data:data!, encoding: NSUTF8StringEncoding)
if (ipString != nil) {
let jsonClientList = try NSJSONSerialization.JSONObjectWithData(data!, options: NSJSONReadingOptions.MutableContainers) as! NSArray
for item in jsonClientList {
let firstName = item["firstName"]
//I tried to print the data from json and its working!
print(firstName as! String)
//Line not working
//I tried to insert the firstName to clientList array
self.clientList.append(firstName as! String)
}
}
//If I use this its working
// self.clientList = ["Mango", "Banana", "Orange", "Guava", "Grapes"]
}
} catch{
print("Something bad happed!")
}
}
).resume()
//--------------
}
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view.
jsonParser()
}
//---------------------------------

Answer 1

you forget to refresh the new data to show in table, do like
self.clientList.append(firstName as! String)
}
dispatch_async(dispatch_get_main_queue())
self.yourtableViewname.reloadData()
}

Answer 2

As mentioned in the other answer the issue is that the table view needs to be reloaded.
In Swift there is a more convenient way to populate the data source array without repeat loop using the map function.
It assumes – like in the question – that all dictionaries in jsonClientList contain a key firstName.
tableView is the name of the UITableView instance.
...
let jsonClientList = try NSJSONSerialization.JSONObjectWithData(data!, options: []) as! [[String:AnyObject]]
self.clientList = jsonClientList.map{ $0["firstName"] as! String }
dispatch_async(dispatch_get_main_queue()) {
self.tableView.reloadData()
}
}
} catch {
...
Reading the JSON with mutable containers is not needed in this case.