有一种方法可以在一段时间后解除无按钮UIalertView吗？

UIAlertView *alertView = [[UIAlertView alloc] initWithTitle:@"tittle"
               message:@""
                 delegate:self
              cancelButtonTitle:@""
              otherButtonTitles:nil];
  [alertView show];
  [alertView release];
UIAlertView *alertView = [[UIAlertView alloc] i