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when i use UIDocumentBrowserViewController, and get file's documentURL ,like" file:///private/var/mobile/Containers/Data/Application/8F45C0E0-446B-4C89-A7AB-95E148BE0F41/Documents/sd1513175706_2.MP4 ", and i use [NSData dataWithContentsOfFile] to get data, but it's not work. what's the problem ?

好多余先生丶
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You need to call startAccessingSecurityScopedResource on that URL to consume the sandbox extension vended to you by the document browser. Don’t forget to call stopAccessing once you are done in order not to leak kernel resources.

Thomas Deniau
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