Github user jcesarmobile commented on the pull request:
https://github.com/apache/cordova-plugin-dialogs/pull/54#issuecomment-181897098
getTopPresentedViewController returns the view controller on the top, not
necessarily the mainViewController, the dialog has to be presented over the top
view controller. If you dismiss the barcode scanner and you still get the
CDVbcsViewController as the topPresentedViewController, it might be a bug on
the phonegap-barcode-scanner plugin.
Can you link the plugin you are using? I can't find anything if I search by
phonegap-barcode-scanner on npm, and there are a few on github
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