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OnTrackableStateChanged after Suspend

July 9, 2018 - 9:38am #1

Vuforia SDK Version: v7.2.20 -
Description with steps to reproduce: Unity: 2018.2.0f1
Vuforia: 7.2.20
XCode: 9.4.1
iPhone: 6s
iOS: 11.4


Behavior in Background is set to `Suspend`


Detect a target.
Close app via Home Button
Double Tap Home Button and bring app into foreground.


This triggers `OnTrackableStateChanged` with last detected target (before leaving the app) as if it is still visible (but it is not).

public void OnTrackableStateChanged(
TrackableBehaviour.Status previousStatus,
TrackableBehaviour.Status newStatus)
String trackableName = mTrackableBehaviour.TrackableName;

if (newStatus == TrackableBehaviour.Status.TRACKED)
else if (newStatus == TrackableBehaviour.Status.NO_POSE && previousStatus == TrackableBehaviour.Status.NO_POSE)
// Initial start of application
// Do nothing
Development OS (Mac OS X, Windows, Linux): Mac OS X -
Mobile OS and Version: iOS 11.4 15F79 -
Mobile Device Manufacturer and Model name: iPhone 6s MKQP2ZD/A -
Do the Vuforia Sample Applications show the same behavior?:

OnTrackableStateChanged after Suspend

July 9, 2018 - 10:49am #2



Please close this ticket. The problem was a Coroutine in the application logic.

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