objective-c API v2 - getMetaData Problem with Block response

I am converting to objective C API v2.  I wrote this route to verify if a file is in a dropbox directory called DA.  I get on the NSLog that the file exits, but the BOOL return value of the function is always 0.  Any help would be appreciated.

- (BOOL)verifyFileInDropboxWith:(NSString *)fileName {
    __block BOOL fileOnDB = NO;
    NSString *dBFilePath = [NSString stringWithFormat:@"/DA/%@",fileName];
    DropboxClient *client = [DropboxClientsManager authorizedClient];
    [[client.filesRoutes getMetadata:dBFilePath]
     response:^(DBFILESMetadata *result, DBFILESGetMetadataError *routeError, DBError *error){
         if([result.name containsString:fileName])
         {
             NSLog(@"File already exists DB");
             fileOnDB = YES;
         } else {
             NSLog(@"File does not exist in DB");
             fileOnDB = NO;
         }
     }];
    return (fileOnDB);
    
}