为什么我的iOS App的“文档”目录成为文件？

Question

We are developing an iOS app with Enterprise distribution. It ran well in hundreds of devices, but we found some iOS 6.1.3 devices failed to launch it hours later the first run, because the App's Documents directory became a file !

Our App did nothing special except it was downloading about 80MB MP4 files from a remote HTTP server.

I assumed that something wrong when it operated the Documents directory, but so far have little clue to identify what's 'dangerous' usage in our codes.

Did you have encountered similar problems? How did you fix it?

Thanks a lot to anybody kindly helping to figure it out.

Answer 1

What I suggest doing is for your app to test for this when it launches, and if there is a file there, move it to some other place (like the temp folder), then create the Documents directory, then move the file back into that directory with the same name (or change the name). That will at least prevent your app from stalling.

If you have any means of remote logging, you could bin hex the first 64 bytes of the file and send it to your service for analysis (if you know what's in the file it should help you figure out who created it.)