Subject: Re: Show UIActivityIndicatorView asynchronously




Am 28.04.2011 um 12:26 schrieb Philip Vallone:

> Hi,
>
> I have a UIViewController that can take a few seconds to load. The view
> searches an XML file and eventually displays the resuts. I want to show a
> UIActivityIndicatorView while the view loads. Unfortunately they are on the
> same thread. How can I get the UIActivityIndicatorView to display befiore the
> view loads?

You can not. The display will wait for the end of the runloop.

> With the below code, the UI freezes up (indicator never shows) until the
> search is done.

Your UI would still freeze, even if you could get the indicator on screen.

> [self.activityIndicator startAnimating];
>
> TitleSearchResultsViewController *controller =
> [[TitleSearchResultsViewController alloc]
> initWithNibName:@"TitleSearchResultsViewController" bundle:nil];
> [controller setTitle:@"Search Results"];

Your controller needs to to its work in another thread and signal the main
thread if it is done.

atze


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