Swift WKWebView "Error acquiring assertion" after updating to Xcode 11

Question

I appreciate help to resolve the following problem. This problem appeared after I updated to Xcode 11.

A WKWebView opens a web page that contains an embedded Vimeo video. The page loads and displays the embedded player. When I tap on the video to play it, I received the following errors in the console:

[assertion] Error acquiring assertion: { userInfo = { RBSAssertionAttribute = ; } }

[ProcessSuspension] 0x1056fde38 - ProcessAssertion() PID 1887 Unable to acquire assertion for process with PID 1887 2019-09-22 11:15:04.570119-0700 testWeb[1887:362082] [ProcessSuspension] 0x1056fde38 - ProcessAssertion::processAssertionWasInvalidated() 2019-09-22 11:15:04.576732-0700 testWeb[1887:362143] [assertion] Error acquiring assertion: { userInfo = { RBSAssertionAttribute = ; } }

[ProcessSuspension] 0x1056fde88 - ProcessAssertion() PID 1887 Unable to acquire assertion for process with PID 1890 2019-09-22 11:15:04.577137-0700 testWeb[1887:362082] [ProcessSuspension] 0x1056fde88 - ProcessAssertion::processAssertionWasInvalidated() 2019-09-22 11:15:05.261258-0700 testWeb[1887:362150] [plugin] AddInstanceForFactory: No factory registered for id F8BB1C28-BAE8-11D6-9C31-00039315CD46

This is running on Xcode 11 and the problem appears on the simulator and on devices running iOS 13 and iOS 12.

Answer 1

WKWebview modal presentation style is changed from Xcode 11 with iOS 13. I think this happens only if you have implemented some action on cancel or done and this is not handled. Please note viewWillAppear also not called in this case. Try implementing willMove(toParent:) or isModalInPresentation