> On Nov 5, 2015, at 2:37 PM, Carl Hoefs <newsli...@autonomy.caltech.edu> wrote:
>
> iOS 9.1, iPhone 5S, ObjC
>
> I'm getting the following runtime warning due to multiple simultaneous
> UIAlertControllers presenting at the same time:
>
> Warning: Attempt to present <UIAlertController: 0x1835c000> on
> <MyViewController: 0x17d26e70> which is already presenting
> <UIAlertController: 0x18381400>
>
> I know only one alert view controller can be presenting at a time, so the way
> I thought to serialize execution of each -presentViewController:: is:
>
> dispatch_async( dispatch_get_main_queue(), ^{
> [ self presentViewController: alert
> animated: YES
> completion: nil ];
> });
>
> Why isn't dispatch_get_main_queue() enforcing serialized execution?
It does enforce serialized execution, but that doesn’t help if what you are
asking for is effectively asynchronous as well (you just get your requests
issued in a serialized fashion).
> Is there another way to do this?
The completion handler on -presentedViewController:animated:completion:
notifies you when the presentation is complete and it is safe to present
another view controller.
> -Carl
>
>
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David Duncan
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