uiAlertController not dismissing someTimes - swift

Question

I have login button which is http get service I run a popUp alert for waiting when user taps on button and I dismiss it when I fetch data.
but some times sucks on loading alert.test it on iPhone 5s but working on simulator properly.what I'm doing wrong??
#IBAction func loginButton(_ sender: Any) {
phone=phoneText.text!
if (validation(phone: phone)){
popUpLoading()
guard let url=URL(string: address+"uSers/checkUser/\(phone)") else{return}
print(url)
var requst=URLRequest(url: url)
requst.httpMethod="GET"
URLSession.shared.dataTask(with: requst, completionHandler: { (data, response, error) in
if let response=response{
//print(response)
}
if let data=data{
do{
let json=try? JSONSerialization.jsonObject(with: data, options:JSONSerialization.ReadingOptions.mutableLeaves) as! [String:Any]
print("jsom : ",json)
DispatchQueue.main.async {
self.popalert.dismiss(animated: true, completion: {
let data=json?["data"] as! String
print("data : ",data)
}
}
popalert variable is declared global
this is pop up alert for waiting :
func popUpLoading(){
DispatchQueue.main.async {
self.popalert = UIAlertController(title: "", message: "wait...", preferredStyle: .alert)
let loadingIndicator = UIActivityIndicatorView(frame: CGRect(x: 10, y: 5, width: 50, height: 50))
loadingIndicator.hidesWhenStopped = true
loadingIndicator.activityIndicatorViewStyle = UIActivityIndicatorViewStyle.gray
loadingIndicator.startAnimating();
self.present(self.popalert, animated: true, completion: nil)
self.popalert.view.addSubview(loadingIndicator)
}
}

Answer 1

You have called the dismiss function which is,
( self.popalert.dismiss(animated: true, completion: { )
inside the response call. So the alert view will be hidden only if you are getting a proper response from the URL.
You should be hiding the alert view in both scenarios
- so use else condition for if statement and dismiss the alertView