UIAlertView performSelectorOnMainThread

Question

I'm loading data from a server and when the data is received, I change the view. For that, I use "performSelectorOnMainThread" and the selector is the method that loads the data and in the end change the view.

My problem is I want to display a UIAlertView while performing this task.

It works when I use "performSelectorInTheBackground", the problem is on the next view, I display an other AlertView when the view appears and there's a concurrency between the two views

When I try : ` [alertDownload show];

    UIActivityIndicatorView *indicateur = [[UIActivityIndicatorView alloc] initWithActivityIndicatorStyle:UIActivityIndicatorViewStyleWhiteLarge];

    indicateur.center = CGPointMake(alertDownload.bounds.size.width / 2, alertDownload.bounds.size.height - 50);
    [indicateur startAnimating];
    [alertDownload addSubview:indicateur];







[self performSelectorOnMainThread:@selector(getPositionList) withObject:nil waitUntilDone:YES];`

The UIAlertView is displayed but just before the view changes ...

What's the best way to do this ?