when i scan the imageTarget first it shows the AlertView then click OK button it goes off, again scan the imagetarget the AlertView is not showing. I referred here
UIEvent AlertView disappear
This is the "iOS version" of the same question you posted here:
See my answer there for Android; for iOS, the solution is basically the same, just need to "reset" the _numResults variable:
(state.getNumTrackableResults() == 0) _numResults = 0;
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