UIAlertView warning when dismissing

Question

I'm creating an alert in the following manner:

let alert = UIAlertView(title: "Network Unavailable",
                      message: "Oh noes!",
                     delegate: nil,
            cancelButtonTitle: "OK")
alert.show()

Works fine. However when I click the 'OK' button to dismiss the alert, I get this:

Warning: Attempt to dismiss from view controller <_UIAlertShimPresentingViewController: 0x16ea2230> while a presentation or dismiss is in progress!

Some context:

1. The alert is created in didMoveToView(view: SKView!) function of an SKScene.
2. This is in Xcode 6 beta 3.
3. my example is swift but this also happens from Objective-C

Any ideas why this warning might be occurring? I don't want to ignore it in case it turns into a fatal error in a future version of iOS.

UPDATE

I should also add that when the alert appears, when I select Debug -> View Debugging -> Capture View Hierarchy, the alert is not shown in the 3d view of the views. I'm wondering if this is symptomatic of something I'm doing wrong.

Leralerch

Why obviously in Swift?! I personally think Swift is one of the most confusing, irritating and bad designed languages I've ever read... Nevertheless, I have the same issue and think this still might be a bug! Mind we're still in beta! – Symer

@Julian - "obviously in swift" because the code example is swift not because the bug only manifests in Swift. OP is obviously concerned its a swift bug. – Periodical

Have you tried these solutions: #14908018 – Periodical

I would have expected to be able to generate a UIAlertView from anywhere and would expect the default 'cancel' button to close that alert without me having to do anything for it to do so 'cleanly'. I have even tried creating the alert from within the main view controller but closing the alert gives the same warning in this case. I'm starting to suspect it is a bug. – Leralerch

I'm having the same problem. Not using spritekit or Swift (100% objective-c). Tapping cancel causes the error, and makes the next actionsheet to load extremely slowly. – Alongshore

Also, I've been trying to debug this and I noticed that didPresentActionSheet is NOT being called. This is consistent with it "not being displayed" technically. – Alongshore

Answer 1

I was getting the same warning:

Warning: Attempt to dismiss from view controller <_UIAlertShimPresentingViewController:> while a presentation or dismiss is in progress!

In iOS8, UIAlertController replaces UIAlertView. This should resolve your warning (in Objc):

UIAlertController *alert =
  [UIAlertController alertControllerWithTitle:@"Network Unavailable"
                                      message:@"Oh noes!"
                               preferredStyle:UIAlertControllerStyleAlert];

UIAlertAction *cancelAction =
  [UIAlertAction actionWithTitle:@"Ok"   
                           style:UIAlertActionStyleCancel
                         handler:^(UIAlertAction *action) {
                                                        }];
[alert addAction:cancelAction];    
[self presentViewController:alert animated:YES completion:nil];

See the documentation for UIAlertController for more info.

Dost