Slow performance for presentViewController - depends on complexity of presentING controller?

Question

I am presenting a view controller:

SCAAboutController2 *controller = [[SCAAboutController2 alloc] initWithNibName:nil bundle:nil];
UINavigationController *navCon         


        

Answer 1

I had similar problem where the callback was on a different thread than the main thread. Using

            DispatchQueue.main.async {
                 Your_UI_update_function()
            }

solves the slow UI update problem for me.