Swift: Show UIAlertController in didReceiveLocalNotification method - swift2

Question

I want to show alert when notification is fired while app is running, here is tutorial which i used for local notifications. In tutorial, it uses UIAlertView to show alert and it works, here is code:
func application(application: UIApplication, didReceiveLocalNotification notification: UILocalNotification) {
// Point for handling the local notification when the app is open.
// Showing reminder details in an alertview
UIAlertView(title: notification.alertTitle, message: notification.alertBody, delegate: nil, cancelButtonTitle: "OK").show()
}
but it gives warning that UIAlertView is deprecated in iOS 9, so i used UIAlertController, but when i run it it gives warning:
Attempt to present <UIAlertController: 0x7c322a00> on <xxx> whose view is not in the window hierarchy!
Here is my didReceiveLocalNotification method:
func application(application: UIApplication, didReceiveLocalNotification notification: UILocalNotification) {
let alert = UIAlertController(title: "", message: notification.alertBody, preferredStyle: UIAlertControllerStyle.Alert)
alert.addAction(UIAlertAction(title: "Ok", style: UIAlertActionStyle.Default, handler: {(action: UIAlertAction!) in
}))
self.window?.rootViewController?.presentViewController(alert, animated: true, completion: nil)
}
How i can show UIAlertController in didReceiveLocalNotification method? I also tried:
let activeViewCont = application.windows[0].rootViewController?.presentedViewController
activeViewCont!.presentViewController(alert, animated: true, completion: nil)

Answer 1

Try this:
func application(application: UIApplication, didReceiveLocalNotification notification: UILocalNotification) {
var topController : UIViewController = (application.keyWindow?.rootViewController)!
while ((topController.presentedViewController) != nil) {
topController = topController.presentedViewController!
}
let alert = UIAlertController(title: "", message: notification.alertBody, preferredStyle: UIAlertControllerStyle.Alert)
alert.addAction(UIAlertAction(title: "Ok", style: UIAlertActionStyle.Default, handler: {(action: UIAlertAction!) in}))
topController.presentViewController(alert, animated: true, completion: nil)
})
Hope it helps.