NSFileManager -createFileAtPath fails NSInvalidArgumentException

Maybe I just missed something in the documentation, but I can't find anything that says this behavior should have changed in iOS 8.

My application sets the current working directory to a directory Documents

and then tries to create a file there with NSFileManager -createFileAtPath

. Before iOS 8, this works fine. On devices running iOS 8, I get the following when called-createFileAtPath:

 *** Terminating app due to uncaught exception 'NSInvalidArgumentException',
 reason: '*** -[NSFileManager fileSystemRepresentationWithPath:]: nil or empty path argument'

      

        
        
        
      

    

Here is a minimal code snippet that reproduces the problem:

NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *docsDir = [paths objectAtIndex:0];
[[NSFileManager defaultManager] changeCurrentDirectoryPath:docsDir];
[[NSFileManager defaultManager] createFileAtPath:@"temp.dat" contents:nil attributes:nil];

      

        
        
        
      

    

Note that the path argument createFileAtPath

is "temp.dat"

- , if I change it to "./temp.dat"

, the call will succeed.

Am I doing something stupid and was it just "accidental" working on previous versions of iOS? Or were they deliberately changing the behavior here? Or is this a bug in iOS 8? Other NSFileManager methods that take an argument path

look fine, just with a filename (for example, -removeItemAtPath:@"temp.dat" error:&err

successfully).

Edited to add:

This only happens on a physical device. In the simulator, the above call createFileAtPath

succeeds.