Question

I have a download button in my view and when the button is clicked, the app opens the app store with [[UIApplication sharedApplication] openURL]
However when I switch back to my app, I find that the [popViewController animated:YES] in my app is not animating.
I debug it for a few days and solved the problem, the reason is that in my applicationWillEnterForeground method, i did this:

[tabBarController.selectedViewController viewWillAppear:YES];

AND I had the bug.
My question is, why after i invoked this method, all my [popViewController animated:YES] is not working…

Answer 1

I don’t know exactly why you had that bug, but as Apple documentation, you shouln’t call the - (void)viewWillAppear:(BOOL)animated method.

UIViewController doc

It’s a notification method, made to be overriden, and never called.