file provider storage iphone not read in device but simulator works fine iOS swift

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Problem:

I'm using filemanger to fetch the pdf file and save to document directory.I had tried in simulator it was working fine.In device it was not working.It returns data with nil value.Path will be as like below. 


Solution:

 /private/var/mobile/Containers/Shared/AppGroup/some code/67225671.pdf

After you fetch the pdf from file manager add the line below 

            url.startAccessingSecurityScopedResource()

Then only it will works fine in the device.

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