I forgot the code:

        NSURL* directoryURL = [NSURL 
URLWithString:@"/.DocumentRevisions-V100/"];
        NSFileManager* manager = [NSFileManager defaultManager];
        NSArray* keys = @[NSURLNameKey, NSURLIsDirectoryKey];

        NSDirectoryEnumerator* enumerator = [manager 
enumeratorAtURL:directoryURL includingPropertiesForKeys:keys 
options:NSDirectoryEnumerationSkipsSubdirectoryDescendants 
errorHandler:^BOOL(NSURL *url, NSError *error){return true; }];

        for (NSURL* file in enumerator)
        {

        }


> On 22 Oct 2016, at 21:11, Jean Suisse <jean.li...@gmail.com> wrote:
> 
> Jens,
> 
> The code below doesn’t crash.
> To refine, what difference is there between ObjC’s 
>       for (NSURL* file in enumerator)
> 
> and swift’s
> 
>       while let file = enumerator?.nextObject() as? URL
> ?
> 
> Jean
> 
> 
> 
> 
>> On 22 Oct 2016, at 20:55, Jens Alfke <j...@mooseyard.com 
>> <mailto:j...@mooseyard.com>> wrote:
>> 
>> 
>>> On Oct 22, 2016, at 11:42 AM, Jean Suisse <jean.li...@gmail.com 
>>> <mailto:jean.li...@gmail.com>> wrote:
>>> 
>>> To add a little more information: it happens when encountering any 
>>> directory that the user can’t read.
>>> My app should get an access denied error (the enumerator should be nil for 
>>> instance). It shouldn’t crash.
>> 
>> Try writing the same code in Objective-C and see what happens. (That could 
>> be a workaround: implement this piece of functionality in Obj-C and then 
>> call into it from your main Swift code.)
>> 
>> —Jens
>> 
> 

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