iOS10 + Xcode8 documentDirectory weird behavior

Question

It seems the documentDirectory in Xcode8/Swift3/iOS10, in a framework, on iOS seems unwritable.

API's used / tried:

FileManager.default.urls(for: .documentDirectory, in: .userDomainMask)

NSSearchPathForDirectoriesInDomains(.documentDirectory, .userDomainMask, true)

( The last one does not seem to be preferred in Swift, which I can understand )

Now, whenever I try to write files to the URL returned in this area I do not seem to be capable of doing so ( both Simulator, and device ). Downloading the container or inspecting it does not show the files either ( I tried several methods of writing ). Also trying to create a directory to write into seems to fail.

The weird thing is that there is no error returned from within API's used or the FileManager itself.

Is there some horrible point I'm missing? Is it a bug I should report? Currently I moved to creating a directory in Library/ instead, as that seems to work and shouldn't be as volatile as Library/Cache/.

Code used to write ( realm.io was used before I decided to do this ):

let URLs = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask)
let data = Data.random(32) // Generates a 32 byte long random blob 
try! data.write(to: URLs.last!) // Crashing here with a forced unwrap is fine

@LeoDabus yes, but I dealt with that in the code following these API's. Good point to bring up though. It is annoying for instance when you access application support. — Antwan van Houdt, Dec 16 '16 at 18:36
Can you show us the code you are using to write into the directory? — retainCount, Dec 16 '16 at 18:37
@retainCount Done that, hopefully useful enough. Probably going to delete this question since its already receiving downvotes, but yeah been driving me nuts. — Antwan van Houdt, Dec 16 '16 at 20:04
The downvotes are probably related to the negative commentary. — retainCount, Dec 16 '16 at 21:51

score 0 · Answer 1 · answered Dec 16 '16 at 21:50

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The path that you are writing to is invalid – you're passing in the directory path instead of the path to the file you want to create. You can craft a path like this:

let path = NSString(string: URLs.last!.path).appendingPathComponent("foo.txt")

answered Dec 16 '16 at 21:50

retainCount

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Thank you for your input and time so far, however I tried doing it like this and it doesn't seem to help much, both paths except for the file:// part are completely the same character for character. Container after implementation: https://www.dropbox.com/s/rj8hufkc0yb9lx6/Screenshot%202016-12-17%2001.54.59.png?dl=0 – Antwan van Houdt Dec 17 '16 at 00:55

score 0 · Accepted Answer · answered Jul 21 '17 at 09:28

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Turns out you need to completely reset your Simulators and restart Xcode. Fun stuff.

answered Jul 21 '17 at 09:28

Antwan van Houdt

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iOS10 + Xcode8 documentDirectory weird behavior

2 Answers2