Как получить список файлов директории os x?

NSOpenPanel *panel = [[NSOpenPanel alloc] init];
    [panel setCanChooseDirectories:YES];
    [panel setCanChooseFiles:NO];
    [panel setAllowsMultipleSelection:NO];
    if([panel runModal] == NSOKButton){
      ...
}

NSArray *urls = [panel URLs];
NSArray *dirs = [[NSFileManager defaultManager] contentsOfDirectoryAtPath: [urls[0] path] error:&err];

NSError *error = nil;
NSArray *arr = [[NSFileManager defaultManager] contentsOfDirectoryAtPath:@"//" error:&error];
NSLog(@"%@", arr);

- (NSString *)resolvePath:(NSString *)path {
    NSString *expandedPath = [[path stringByExpandingTildeInPath] stringByStandardizingPath];
    const char *cpath = [expandedPath cStringUsingEncoding:NSUTF8StringEncoding];
    char *resolved = NULL;
    char *returnValue = realpath(cpath, resolved);

    if (returnValue == NULL && resolved != NULL) {
        printf("Error with path: %s\n", resolved);
        // if there is an error then resolved is set with the path which caused the issue
        // returning nil will prevent further action on this path
        return nil;
    }

    return [NSString stringWithCString:returnValue encoding:NSUTF8StringEncoding];
}