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iOS 11.2.2 and Vuforia 7

January 17, 2018 - 11:02am #1

Hi, I'm seeing some strange problems with this combination.

My app works fine with:

* Vuforia 5.0.6 on iOS 11.2.2

* Vuforia 7.0.43 on iOS 10.2 and other versions

* Vuforia 7.0.43 on iOS 11.2.0

But with Vuforia 7.0.43 in iOS 11.2.2 I see a very strange problem.

1) Run the app, start the AR viewfinder and cloud scanning.

2) Kill the app

3) Restart the app

I now only get the splash screen, and eventually a black screen. It doesn't happen (annoyingly) when I restart from the debugger.

Obviously, theory says a fresh run of an app shouldn't be effected by previously killing the app, but something is going awry here.

= Martin =

iOS 11.2.2 and Vuforia 7

February 1, 2018 - 3:16pm #4

Hi - sorry I should have responded earlier.

Whilst I was preparing a minimal app I discovered what the problem was caused by.

Version 7 of Vuforia is more open to issues where you call Vuforia::onPause() an Vuforia::onResume() very close to each other. I had some scene swap initialisation code that deleted the previous scene content between a pause and resume of Vuforia, which provoked a crash. earlier versions of Vuforia don't exhibit this behaviour so I suspect something asynchronous is happening that trips up with quick successive calls of these two interfaces.

In my case - it wasn't strictly necessary to pause and resume, just a precaution. On removing it I resolve the issue.

= Martin =

iOS 11.2.2 and Vuforia 7

January 22, 2018 - 3:35pm #3

Hi Martin,

Which devices are you seeing this on? Are you able to reproduce it in the sample apps?


Vuforia Support

iOS 11.2.2 and Vuforia 7

January 22, 2018 - 11:15am #2

Same problem here.

black screen



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