Dismissing modal view controller causes the screen to black out - iOS 8

[adityatrivedi]

Reproduction Steps:

1. Launch the app
2. Tap on "Present view controller"
3. Tap the "done" button
4. Black screen appears

I think I found the place where the problem seems to be.
In iOS 8 [transitionContext completeTranstion:YES] seems to be doing something weird. If you comment that line of code out, you can see the destination view controller, but cannot interact with it.

[ashfurrow]

This is due to a serious bug in the current betas of iOS 8. I've filed a radar, which you can duplicate. In the mean time, there is a workaround. Let me know if you have any questions.

[marianoabdala]

I'm so glad I found this. Workaround works great, thanks!

[maxhs]

This has been very frustrating to debug. Great catch/observation(s).

[BlakeLucchesi]

Thank you so much for posting the SO link. Saved my sanity!

[victorBaro]

This solution worked for me

[gautamjain987]

This worked for me.
[[UIApplication sharedApplication].keyWindow addSubview:toViewController.view];
toViewController.view.userInteractionEnabled = YES;

[rainypixels]

FYI — I just upgraded to XCode 6.1 GM2 / iOS 8.1 B2, and the workaround isn't needed anymore.

[heitor-canabal-movile]

@rainypixels I upgraded XCode 6.1 and it did not work for me. Can you show your code, please?

[carguezu]

You also can check this PR that solves the issue: #6

Or check this example: https://github.com/carguezu/CGZTransitions

[pbassut]

@carguezu weird. The only thing I did was setting the modalPresentationStyle before actually presenting the viewController to get the transparent background, like this:

    InfoViewController *info = [[InfoViewController alloc] initWithNibName:@"InfoViewController" bundle:nil];
    info.modalPresentationStyle = UIModalPresentationCustom;
    [self presentViewController:info animated:YES completion:nil];

It's weird because I've tried that before, and it didn't work.

[kingja01]

If you use custom view controller transition style. The IOS8 fixed some bugs in IOS7.
U don't need to add fromViewController.view anymore.
-------------------Don't use this.
//[transitionContext.containerView addSubview:fromViewController.view];
//[transitionContext.containerView addSubview:toViewController.view];
//[transitionContext.containerView addSubview:fromViewController.view];

-------------------Fix it like this
UIView *containerView = [transitionContext containerView];
UIViewController *fromViewController = [transitionContext viewControllerForKey:UITransitionContextFromViewControllerKey];
UIViewController *toViewController = [transitionContext viewControllerForKey:UITransitionContextToViewControllerKey];

// Boolean value to determine presentation or dismissal animation
if (self.presenting){
[transitionContext.containerView addSubview:toViewController.view];
// Your presenting animation code
} else {
// Your dismissal animation code
}

Check the solution from DJSK.
http://stackoverflow.com/questions/25588617/ios-8-screen-blank-after-dismissing-view-controller-with-custom-presentation

[carguezu]

@kingja01 dude, that is the same as I mentioned before 👍

[nihilenz]

I tried the solution provided by @kingja01 and everything seems ok using the traditional UIKit animations version.
But using the UIKit Dynamics version I have some issues with non-interactive dismiss (Dismiss button).

The button stops working in some situations (if you are quick to open and dismiss) and the app remains stuck in this state.

In this example the button stops working with no warning, in my app with "Warning: Attempt to dismiss from view controller while a presentation or dismiss is in progress!"

Any idea?

[ashfurrow]

Hmm, I've not seen that, but I have not extensively worked with custom transitions in iOS 8, and there are some differences. Could you post a sample project demonstrating the problem so we could take a look?

[nihilenz]

https://github.com/nihilenz/UIViewController-Transitions-Example

If you are quick to open the left view controller with interactive transition and to tap on the "Dismiss" button, the app remains stuck and a warning can be shown (UIViewController-Transitions-Example[4585:676902] Warning: Attempt to dismiss from view controller <UINavigationController: 0x12ee0d550> while a presentation or dismiss is in progress!)

Thank you very much!