Open Radar

 
Summary:
When a UIActivityViewController sheet is cancelled, the sheet is dismissed but the app UI is dead. The issue only occurs when building under Xcode 5.1.1. It works as expected using Xcode6-Beta2.

Steps to Reproduce:
- In Xcode 5.1.1, create an app that opens a UIViewController:

- (IBAction)share:(id)sender {
	UIActivityViewController* activityViewController = [[UIActivityViewController alloc] initWithActivityItems:@[@"abc"] applicationActivities:nil];
	[self presentViewController:activityViewController animated:YES completion:nil];
}

- Execute the share: action (i.e. by a button).
- Tap "Cancel"

Expected Results:
The UI should work normally after the UIActivityViewController is dismissed

Actual Results:
The UI is dead.

Version:
iOS 8.0 beta 2

Notes:
This is a regression from iOS 7.1.1.

(lldb) po [[UIApplication sharedApplication] keyWindow]
<_UIAlertControllerShimPresenterWindow: 0x13ee22140; frame = (0 0; 320 568); opaque = NO; gestureRecognizers = <NSArray: 0x1700509b0>; layer = <UIWindowLayer: 0x178220080>>

This reveals that the keyWindow isn't correctly reset after dismissing UIAVC.

Configuration:
iPhone 5s