Mac/iOS - Checks whether a file URL is a document package, regular or a folder.

DocumentPackageCheck.mm

// Assume base path is your Desktop
NSURL * baseFileURL = [[[NSFileManager defaultManager] URLsForDirectory:NSDesktopDirectory inDomains:NSUserDomainMask] lastObject];
NSURL * fileURL = [baseFileURL URLByAppendingPathComponent:@"__FILE_NAME__"];
// the keys we are interested in
NSArray * attrArray = @[NSURLIsPackageKey, NSURLIsRegularFileKey, NSURLIsWritableKey, NSURLIsDirectoryKey];
NSDictionary * theDict = [fileURL resourceValuesForKeys:attrArray error:nil];
NSLog(@"the dict: %@", theDict);