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https://issues.apache.org/jira/browse/CB-2667?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13601296#comment-13601296
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Shazron Abdullah commented on CB-2667:
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Possible related issue: CB-2395
> CDVUserAgentUtil acquireLock issue
> ----------------------------------
>
> Key: CB-2667
> URL: https://issues.apache.org/jira/browse/CB-2667
> Project: Apache Cordova
> Issue Type: Bug
> Components: iOS
> Reporter: Andrew Trice
> Assignee: Andrew Grieve
>
> This issue was reported from a PhoneGap customer. I've requested additional
> detail/steps to reproduce:
> We are using UIPageViewController and adding a CDVViewController as a data
> view controller for each Page in the UIPageViewController. When the user is
> trying to scroll to the next page while the content of the CDVViewController
> (html contents) are not fully loaded, all subsequent page scrolls will cause
> the html page to be blank.
> We found this issues is caused by the [CDVUserAgentUtil
> acquireLock:^(NSInteger lockToken) in the CDVViewController and
> [CDVUserAgentUtil releaseLock:_userAgentLockToken] in the
> webViewDidFinishload; When this happens, the acquireLock and releaseLock
> pair does not work properly. After we removed both call in the
> CDVViewController, we don't see the problem anymore.
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