UIAlertController is moved to buggy position at top of screen when it calls `presentViewController:`

Question

Presenting a view from a UIAlertController moves the alert to a buggy position at the top-left corner of the screen. iOS 8.1, device and simulator.

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Answer 1

User manoj.agg posted this answer to the Open Radar bug report, but says:

Somehow I don't have enough reputation to post answers on Stackoverflow.

Posting his answer here for posterity. I have not tested/evaluated it.

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Step 1:

Create a custom View Controller inheriting from UIViewController and implement UIPopoverPresentationControllerDelegate:

@interface CustomUIViewController : UIViewController

Step 2:

Present the view in fullscreen, making use of the presentation popover:

CustomUIViewController *viewController = [[CustomUIViewController alloc] init];
viewController.view.backgroundColor = self.view.tintColor;
viewController.modalPresentationStyle = UIModalPresentationOverFullScreen;

UIPopoverPresentationController *popController = viewController.popoverPresentationController;
popController.delegate = viewController;

[alert presentViewController:viewController animated:YES completion:^{
    dispatch_after(0, dispatch_get_main_queue(), ^{
        [viewController dismissViewControllerAnimated:YES completion:nil];
    });
}];

I had a similar problem where a password input view needed to be displayed on top of any other View Controller, including UIAlertControllers. The above code helped me in solving the problem. Noteworthy change in iOS 8 is that UIAlertController inherits from UIViewController, which was not the case for UIAlertView.