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iOS App Rejected: "...your app stopped responding at launch screen."

November 3, 2014 - 9:32pm #1

Sorry, if this is the wrong place, but I developed with Unity, but the problem only happens on iOS.

So, I submitted my app to the App Store and it has come back rejected with:

We found that your app exhibited one or more bugs, when reviewed on iPad running iOS 8.1 and iPhone 5s running iOS 8.1, on both Wi-Fi and cellular networks, which is not in compliance with the App Store Review Guidelines.

Specifically, your app stopped responding at launch screen.
I have only once been able to recreate something that might be this bug. I got a "badf00d" watchdog timeout in the logs. But after that, it ran normally. When I try to recreate this bug, it often doesn't happen.
Has anyone run into this, and know how to resolve it?
Thank you!

iOS App Rejected: "...your app stopped responding at launch scre

November 10, 2014 - 11:15am #3

I've been through the same issue.

The cause:

- The first time the app is installed, when Vuforia is initializing for the first time, a dialog will prompt for Camera permissions. If this is the case, is because you haven't checked for Camera permissions before, so when the app is trying to access the camera feed for the first time, iOS will ask for permissions for itself (on behalf of the app?). The right way to ask for permissions is the following: http://techcrunch.com/2014/04/04/the-right-way-to-ask-users-for-ios-permissions/



The fix:

- As I said before, you need to implement a permission ask mechanism before you load the Vuforia library / show the view controller. If you do this, when Vuforia needs to show the video feed, the permission will be already in place, and everything will work just fine.


Some notes:

- This is not easy to test. As you said, the first dialog asking for permissions will not show every time you install the app. You will have to follow theses steps (very hacky): https://developer.apple.com/library/ios/technotes/tn2265/_index.html#//apple_ref/doc/uid/DTS40010376-CH1-TNTAG42. 


Hope this helps a bit :)

iOS App Rejected: "...your app stopped responding at launch scre

November 7, 2014 - 9:37am #2

Have you got in touch with Apple to see if they can give you any error logs or additional information on how to reproduce the issue ?

Based on that, you could then debug the issue a little bit deeper and see what goes wrong in your App when running on iOS 8 / iPhone 5S.

If you then spot an issue specifically connected to the use of Vuforia, you can post it back with the relevant details...



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