问确定NSString中的路径是指向目录还是指向文件？

EN

[[NSFileManager defaultManager] fileExistsAtPath:pathname 
                                isDirectory:&directoryFlag];

NSString *file = @"/tmp/";
BOOL isDir = NO;
if([[NSFileManager defaultManager]
     fileExistsAtPath:file isDirectory:&isDir] && isDir){
    NSLog(@"Is directory");
}

NSString *file = @"/tmp/";
BOOL isDir
NSDirectoryEnumerator *dirEnum = [[NSFileManager defaultManager] enumeratorAtPath:file];
while ((file = [dirEnum nextObject])) {
   [[NSFileManager defaultManager] fileExistsAtPath:file isDirectory:&isDir];
   if(isDir){
      NSLog(@"%@ is a directory", file);
   }
}