Swift, Json Dictionary<String, AnyObject> send value to label - ios

Question

I have a json who returns me a Dictionary. I can have values inside but I want to use one of this value to put in a label. I have no error but my label inside my view doesn't change.
Here code:
let url = "http://localhost:8888/connexion/"+login!+"/"+password!
let urlString = url.stringByAddingPercentEncodingWithAllowedCharacters(NSCharacterSet.URLQueryAllowedCharacterSet())!
let request = NSURLRequest(URL: NSURL(string: urlString)!)
let alreadyTask = NSURLSession.sharedSession().dataTaskWithRequest(request, completionHandler: { (data, response, error) in
guard let data = data, let _ = response where error == nil else {
print("error")
return
}
do {
let json = try NSJSONSerialization.JSONObjectWithData(data, options: .AllowFragments) as! Dictionary<String, AnyObject>
print(json)
print(json["3"] as! String)
print(json["4"] as! String)
print(json["5"] as! String)
self.race_label.text = json["3"] as! String
pa_label.text = json["5"] as! String
name_label.text = json["4"] as! String
} catch let error as NSError {
print("json error: \(error.localizedDescription)")
}
})
alreadyTask.resume()
}
And Here log:
["2": blabla12, "1": c#gmail.com, "3": orc, "4": test, "success": 1, "0": 5, "5": 100]
orc
test
100
So, I don't know why it doesn't work. Thank you !

Answer 1

You have to do UI related stuff on the main queue. dataTaskWithRequests calls it's completion handler on a background queue.
To assure your calls are made on the main queue replace:
self.race_label.text = json["3"] as! String
pa_label.text = json["5"] as! String
name_label.text = json["4"] as! String
with:
Swift 2:
dispatch_async(dispatch_get_main_queue(), { () -> Void in
self.race_label.text = json["3"] as! String
self.pa_label.text = json["5"] as! String
self.name_label.text = json["4"] as! String
})
Swift3:
DispatchQueue.main.async {
self.race_label.text = json["3"] as! String
self.pa_label.text = json["5"] as! String
self.name_label.text = json["4"] as! String
}