Rich Storm created CB-12815:
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Summary: WKWebView plugin will not execute Javascript while app is
backgrounded
Key: CB-12815
URL: https://issues.apache.org/jira/browse/CB-12815
Project: Apache Cordova
Issue Type: Bug
Components: cordova-plugin-wkwebview-engine
Environment: iOS
Reporter: Rich Storm
Assignee: Shazron Abdullah
iOS 10 now has power saving requirements and will not allow background tasks to
function to save battery. For example, a VoIP app can no longer use a polling
strategy to stay awake. The new recommended way, according to Apple
(https://developer.apple.com/library/content/documentation/Performance/Conceptual/EnergyGuide-iOS/OptimizeVoIP.html),
is to use VoIP silent push notifications to wake up the app and do the work.
I have verified that all VoIP silent push notifications arrive correctly when
using the UIWebView with a vanilla Cordova install. However, when adding the
cordova-plugin-wkwebview-engine, the Javascript callbacks do not fire correctly
when receiving the VoIP silent push notification while the app is in the
background. What happens is the first notification is queued, then the next
notification forces the first notification result to the callback. Effectively,
making each push notification 1 behind. When the app is put back into the
foreground, the last push notification callback is fired.
When the app is in the foreground, all works fine.
The issue is with the call to "setTimeout" in the iOSExec.nativeCallback
function. It makes sense that if Apple is trying to minimize background
execution to save battery, then they would limit the use of the setTimeout
feature.
This issue is fixed by changing the iOSExec.nativeCallback function to call the
cordova.callbackFromNative function directly without a setTimeout wrapper.
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