Attempting to load the view of a view controller while it is deallocating … UIAlertController

Question

I am building with the release version of Xcode 7.0. No storyboards, just nib files.

I have a single UINavigationController created by the app delegate

Answer 1

In my case, in Swift 3, I had missed the code below after adding the action

presentViewController(theAlert, animated: true, completion: nil)

So, the working code is as below

override func tableView(tableView: UITableView, commitEditingStyle editingStyle: UITableViewCellEditingStyle, forRowAtIndexPath indexPath: NSIndexPath) {

     if (editingStyle == UITableViewCellEditingStyle.Delete) {

        let title = "Delete ????"
        let message = "Are you sure you want to delete this item?"

        let theAlert = UIAlertController(title: title,
                                   message: message,
                                   preferredStyle: .ActionSheet)

     let cancelAction = UIAlertAction(title: "Cancel", style: .Cancel, handler: nil)
     theAlert.addAction(cancelAction)

     let onDelete = UIAlertAction(title: "Delete", style: .Destructive, handler: { (action) -> Void in
     self.items.removeAtIndex(indexPath.row)
     self.tableView.deleteRowsAtIndexPaths([indexPath], withRowAnimation: .Automatic)

     })
     theAlert.addAction(onDelete)
        presentViewController(theAlert, animated: true, completion: nil)
     }
     }

//Note I was using a sample array

var items = ["iPhone", "iPad", "Mac"]

Answer 2

I was finally able to track it down to a UIActionSheet class variable inside a third-party library, Mapbox GL.

I opened an issue with that dev team: https://github.com/mapbox/mapbox-gl-native/issues/2475

Partial credit (and an up vote and bounty) to @Aaoli for mentioning having a UIAlertView as a class variable.

Answer 3

I had this problem by not having a navigationController... I know it sounds obvious but jumping about in various projects this one didn't have a UINavigationControllerto hand.... so others coming here you might want to NSLog your nav controller just for sanity too...

Answer 4

We had the same issue with UIAlertController.

let alert = UIAlertController(title: "", message: "", preferredStyle: UIAlertControllerStyle.Alert)
alert.addAction(UIAlertAction(title: "OK", style: .Default, handler: {(action : UIAlertAction!) in
                //some actions
                              } ))

I had forgot adding the following line. Below line solved the problem.

self.presentViewController(alert, animated: true, completion: nil)

Answer 5

I had the same issue, when I tried to remove a "frame" observer on my view in a UIViewController subclass. I solved this issue by wrapping the removeObserver in a isViewLoaded(). What exactly are you observing?

Answer 6

I solved this by moving some of my code to viewDidAppear. If I used UIAlertController, it would cause the same problem you mentioned and would not be displayed, and I solved it the same way.

Let me know if that doesn't work!