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After upgrading Xcode to version 11.3, popup windows calling in iOS 13 stopped working because keyWindow is deprecated, the code isUIViewController *qtController = [[UIApplication sharedApplication].keyWindow rootViewController]; UIActivityViewController *activityController = [[UIActivityViewController alloc] initWithActivityItems:sharingItems applicationActivities:nil]; [qtController presentViewController:activityController animated:YES completion:nil]; UIPopoverPresentationController *popController = activityController.popoverPresentationController; if (popController) popController.sourceView = qtController.view;In the old Xcode, everything worked fine on iOS 13.