Попробуйте это:
NSArray *documentPaths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDir = [documentPaths objectAtIndex:0];
NSString *xml_path = [documentsDir stringByAppendingPathComponent:@"xmlfolder"]; // if you have folder
NSArray *list =[NSBundle pathsForResourcesOfType:@"xml" inDirectory:xml_path];
NSLog(@"%@",list);