It can actually be done with just a few lines of code. First, we create and position the UIActivityIndicatorView by doing the following. It needs to be added to a view, so be sure to replace “myView” with your own view.

UIActivityIndicatorView *activityView = [[[UIActivityIndicatorView alloc] initWithActivityIndicatorStyle:UIActivityIndicatorViewStyleWhiteLarge] autorelease];
[myView addSubview: activityView];
activityView.center = CGPointMake(240,160);

So now the activity indicator is created and positioned but it isn’t visible yet. You can make it visible at any time by running the following one line:

[activityView startAnimating];

Finally, once you’ve finished loading the copious amounts of awesomesauce that fuel your app, you can make the activity indicator go away by running the following solitary line of code:

[activityView stopAnimating];