Try this:
activityIndicator = [[UIActivityIndicatorView alloc] initWithFrame:CGRectMake(0.0f, 0.0f, 32.0f, 32.0f)];
[activityIndicator setCenter:CGPointMake(160.0f, 208.0f)];
[activityIndicator setActivityIndicatorViewStyle:UIActivityIndicatorViewStyleGray];
[activityIndicator startAnimating];
Calling to setCenter should give the behavior you are expecting.
Good luck!
Pablo Santa Cruz
2009-03-21 12:40:32