Question

I have a UIView that I want to load when the user clicks a button. There happens to be some data processing that happens as well after I call addSubview that involves parsing an XML file retrieved from the web. The problem is the view doesn’t show up until after the data processing even if addSuview is called first. I think I’m missing something here, can anyone help?

Code: I have a “Loading…” view I’m adding as a custom modal (meaning I’m not using the modalViewController). This action is linked to a button in the navigationController.

- (IBAction)parseXml:(id)sender {
      LoadingModalViewController *loadingModal = [[LoadingModalViewController alloc] initWithNibName:@"LoadingModalViewController" bundle:nil];
      [navigationController.view addSubview:loadingModal.view];
      [xmlParser parse];
}

Answer 1

Howdy! If you’re looking for an easy work around:

[self showLoadingScreen]
[self performSelector:@selector(methodToDoWork) withObject:nil afterDelay:0.3];

However you’re better off making methodToDoWork asynchronous if you can.