File is not opening after Downloading has been completed iOS swift - ios

Question

When downloading completed I'm showing the alert that download has been completed after that when user click on dismiss button in alert popup self.quickLook(url: url) func will call.
But not showing the file in webView. When removing the alert code everything working fine and file opening in webView.
func showAlerts(){
let alertController = UIAlertController(title: "Download", message: "Download Completed", preferredStyle: .alert)
alertController.addAction(UIAlertAction(title: "dismiss", style: .default, handler: { _ in
self.dismiss(animated: true, completion: nil)
}))
alertController.addAction(UIAlertAction(title: "Cancel", style: .cancel, handler: nil))
self.present(alertController, animated: true, completion: nil)
}
#IBAction func openDoc(_ sender: UIButton) {
if let url = URL(string: "https://ikddata.ilmkidunya.com/images/books/12th-class-chemistry-chapter-10.pdf") {
self.loadFileAsync(url: url) { response, error in
if error == nil {
self.showAlerts()
self.quickLook(url: url)
}
}
}
}
Check console screenshot
Console screenshot see msg

Answer 1

How's your quickLook implemented? I guess it also calls present. You cannot present two things at the same time on iOS.
An option would be to quickLook after the alert is dismissed. Something like:
func showAlerts(and onDismiss: (() -> Void)? = nil) {
let alertController = UIAlertController(title: "Download", message: "Download Completed", preferredStyle: .alert)
alertController.addAction(UIAlertAction(title: "dismiss", style: .default, handler: { _ in
self.dismiss(animated: true) { onDismiss?() }
}))
alertController.addAction(UIAlertAction(title: "Cancel", style: .cancel, handler: nil))
present(alertController, animated: true, completion: nil)
}
#IBAction func openDoc(_ sender: UIButton) {
if let url = URL(string: "https://ikddata.ilmkidunya.com/images/books/12th-class-chemistry-chapter-10.pdf") {
loadFileAsync(url: url) { response, error in
if error == nil {
self.showAlerts { self.quickLook(url: url) }
}
}
}
}
Judging from your words it's exactly what you expect.