I am trying to center UIActivityIndicatorView over a UITableView but it has top margin

I am using Xcode 4.2 on Snow Leopard. What I am trying to do. Basically, I have a master view controller with a table view. In order to populate the table view I need to call an API and download the information from there. While downloading the data from the API, I would like to show an activity indicator in order to let a user know something is happening and the app is not stuck. What I have done is I have a created a new UIView over the table view with alpha 0.5 and put an activity indicator in its middle. This is the code I execute when the master controller view loads: ``` // Show the activity indicator self.overlayView = [[UIView alloc] init]; self.overlayView.backgroundColor = [UIColor colorWithRed:0 green:0 blue:0 alpha:0.5]; self.overlayView.frame = self.tableView.frame; self.activityIndicator = [[UIActivityIndicatorView alloc] initWithActivityIndicatorStyle:UIActivityIndicatorViewStyleWhiteLarge]; CGRect frame = self.overlayView.frame; self.activityIndicator.center = CGPointMake(frame.size.width/2, frame.size.height/2); [self.overlayView addSubview:self.activityIndicator]; [self.activityIndicator startAnimating]; [self.tableView addSubview:self.overlayView]; ``` When the data is loaded from the API, I hide the overlay view and the activity indicator: ``` [self.activityIndicator removeFromSuperview]; [self.overlayView removeFromSuperview]; ``` It is working fine but the problem is the overlay view is not aligned properly, it has a top margin and it is not looking good. Here's how it looks: