iOS 8 presentationController determine if really is popover

Question

I\'m using the new adaptive \"Present As Popover\" capability of iOS 8. I wired up a simple segue in the StoryBoard to do the presentation. It works great on an iPhone 6 P

Answer 1

Solution that works with multitasking

Assign the presenting controller as the popover's delegate

...
controller.popoverPresentationController.delegate = controller;
[self presentViewController:controller animated:YES completion:nil];

Then, in the controller, implement the delegate methods:

- (void)presentationController:(UIPresentationController *)presentationController willPresentWithAdaptiveStyle:(UIModalPresentationStyle)style transitionCoordinator:(id<UIViewControllerTransitionCoordinator>)transitionCoordinator
{
    if (style != UIModalPresentationNone)
    {
        // Exited popover mode
        self.navigationItem.leftBarButtonItem = button;
    }
}

- (void)prepareForPopoverPresentation:(UIPopoverPresentationController *)popoverPresentationController
{
    // Entered popover mode
    self.navigationItem.leftBarButtonItem = nil;
}

Answer 2

I check to see if the popoverPresentationController's arrowDirection is set after the view is laid out. For my purposes, this works well enough and covers the case of popovers on smaller screened devices.

override func viewWillAppear(animated: Bool) {
    super.viewWillAppear(animated)

    if (popoverPresentationController?.arrowDirection != UIPopoverArrowDirection.Unknown) {
        // This view controller is running in a popover
        NSLog("I'm running in a Popover")
    }
}