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

I tested all solutions presented in this post. Sorry, none works correctly in all cases. For example in iPad split view presentation style can change while dragging split view line, so we need specific notification for that. After few hours of researches i found solution in apple sample (swift): https://developer.apple.com/library/ios/samplecode/AdaptivePhotos/Introduction/Intro.html#//apple_ref/doc/uid/TP40014636

Here is the same solution in obj-c.

First in prepareForSegue function set the popoverPresentationController delegate. It can be also set in MyViewController "init", but not in "viewDidLoad" (because first willPresentWithAdaptiveStyle is called before viewDidLoad).

MyViewController *controller = [segue destinationViewController];
        controller.popoverPresentationController.delegate = (MyViewController *)controller;

Now MyViewController object will receive this notification every time iOS changes presentation style, including first presenting. Here is example implementation which shows/hides "Close" button in navigationController:

- (void)presentationController:(UIPresentationController *)presentationController
  willPresentWithAdaptiveStyle:(UIModalPresentationStyle)style
         transitionCoordinator:(nullable id)transitionCoordinator {
    if (style == UIModalPresentationNone) {
        // style set in storyboard not changed (popover), hide close button
        self.topViewController.navigationItem.leftBarButtonItem = nil;
    } else {
        // style changed by iOS (to fullscreen or page sheet), show close button
        UIBarButtonItem *closeButton =
            [[UIBarButtonItem alloc] initWithTitle:@"Close" style:UIBarButtonItemStylePlain target:self action:@selector(closeAction)];
        self.topViewController.navigationItem.leftBarButtonItem = closeButton;
    }
}

- (void)closeAction {
    [self.presentingViewController dismissViewControllerAnimated:YES completion:nil];
}