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https://issues.apache.org/jira/browse/CB-11063?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15422569#comment-15422569
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Vladimir Kotikov commented on CB-11063:
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[~mobidev3], we've been trying to reproduce these warnings without any success.
Looks like all file reading operations already run in separate threads:
- readAsText:
https://github.com/apache/cordova-plugin-file/blob/21298dce51568a2662adee8ff4bfc9b8c838d3a7/src/ios/CDVFile.m#L860-L879
- readAsDataURL:
https://github.com/apache/cordova-plugin-file/blob/21298dce51568a2662adee8ff4bfc9b8c838d3a7/src/ios/CDVFile.m#L901-L914
- readAsArrayBuffer:
https://github.com/apache/cordova-plugin-file/blob/21298dce51568a2662adee8ff4bfc9b8c838d3a7/src/ios/CDVFile.m#L935-L946
- readAsBinaryString:
https://github.com/apache/cordova-plugin-file/blob/21298dce51568a2662adee8ff4bfc9b8c838d3a7/src/ios/CDVFile.m#L959-L971
If your issue still actual, please post a repro code that produces the warning.
> iOS: File reading doesn't use background thread
> -----------------------------------------------
>
> Key: CB-11063
> URL: https://issues.apache.org/jira/browse/CB-11063
> Project: Apache Cordova
> Issue Type: Improvement
> Components: Plugin File
> Affects Versions: 3.0.0
> Environment: iOS
> Reporter: Michael Schmidt
> Labels: iOS, triaged, wfc
>
> On file reading the following warning appears:
> THREAD WARNING: ['File'] took '23.292236' ms. Plugin should use a background
> thread.
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