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https://issues.apache.org/jira/browse/CB-12846?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16035745#comment-16035745
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Shazron Abdullah commented on CB-12846:
---------------------------------------
The core itself does not continue executing endlessly (there is no event
polling) - it is triggered to pull in commands by JavaScript sending a gap://
url. There is one timer here that gets cleared:
https://github.com/apache/cordova-ios/blob/master/CordovaLib/cordova.js#L1016-L1031
I couldn't possibly repro this exactly - You could try profiling your app in
Safari Web Inspector to see what's going on.
> WebView JS execution continues when app executes in background
> --------------------------------------------------------------
>
> Key: CB-12846
> URL: https://issues.apache.org/jira/browse/CB-12846
> Project: Apache Cordova
> Issue Type: Bug
> Components: cordova-ios
> Affects Versions: [email protected]
> Reporter: Grant Patterson
>
> I'm using a [Cordova
> plugin|https://github.com/happydenn/cordova-plugin-gimbal2] that integrates
> [a third-party SDK|https://docs.gimbal.com/iosdocs/v2/devguide.html] to
> listen for bluetooth beacon sighting events. As expected, my app is allowed
> to run for 10 seconds in the background with the [bluetooth-central
> UIBackgroundMode|https://developer.apple.com/library/content/documentation/iPhone/Conceptual/iPhoneOSProgrammingGuide/BackgroundExecution/BackgroundExecution.html].
> Once the necessary processing is completed, the JS event loop runs until the
> 10-second window closes. Because beacon sightings happen as frequently as
> several per second, the app runs in the background constantly, killing the
> user's battery. I can setInterval() in JS with a 1000ms interval and it runs
> successfully every time; my Angular app runs $digest cycles in the background
> which are unnecessary and quite expensive.
> I think I need a way for the native plugin code to relinquish execution and
> return the app to the background.
> StackOverflow:
> [https://stackoverflow.com/questions/44145031/stopping-background-javascript-activity-on-location-triggered-bluetooth-central]
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