Crear carpetas en el sistema

Utilizar createDirectoryAtPath: withIntermediateDirectories: attributes: error

NSString *directorioTemp = NSTemporaryDirectory();

NSFileManager *fileManager = [[NSFileManager alloc] init];

NSString *ubicacion = [directorioTemp stringByAppendingPathComponent: @"directorionuevo"];

if([fileManager createDirectoryAtPath:ubicacion withIntermediateDirectories:YES attributes:nil error:&errorInfo]){

  NSLog(@"Almacenado correctamente");

}