Question

I allow the user to manage records on other views. I set a flag if certain changes are made.

Then on the flag (where the data changes will have an impact) I run some methods / queries which create the data which is used in my table view(s). This workload currently happens in viewWillAppear(s).

This could take a few seconds and I’d like to show my progress indicator view which I wrote today, it uses a transparent view with a activity indicator in the center of the view.

[self performSelectorInBackground:@selector(startupStuff) withObject:sender];

However, viewWillAppear won’t wait while I run the the work in the background.

Ideally I’m looking for a quick fix to work around this problem.

Any ideas ?

Answer 1

However, viewWillAppear won’t wait while I run the the work in the background.

That’s the whole point of it, isn’t it? At the end of your startupStuff method, you should call another method on the main thread (with performSelectorOnMainThread:...) that is used to (a) inform the controller that your data is ready, (b) reload the table view and (c) dismiss your progress indicator view.