creating button for popover view anchor at run time

Question

This may not be possible, but I'm hoping someone will have an idea how to do it.

I have an app I'm porting from iPhone only to Universal. On the iPhone, I'm using a Tabbed application. I use three tabs for the normal data to be displayed. I have a forth tab that's only displayed if certain conditions are met. To add the tab, I do:

if ([[UIDevice currentDevice] userInterfaceIdiom] == UIUserInterfaceIdiomPhone) 
{
    UITabBarController *tabController = (UITabBarController *) self.rootViewController;
    NSMutableArray* newArray = [NSMutableArray arrayWithArray: tabController.viewControllers];
    [newArray addObject: [theStoryboard instantiateViewControllerWithIdentifier: @"AdditionalView-Phone"]];
    [tabController setViewControllers:newArray animated:YES];
}

For the iPad, I have enough space on the initial view to display everything from the main three tabs in the iPhone UI. So all I need is one additional (small) view for the "Additional" data. I wanted to do it using a popOver view, so I set up the initial view with a Nav bar and popover button as in the Utility App template. But now I'm stuck. I can't figure out how to create that popover button at run time and make it do the segue to the popOver view properly. I can add the button like this:

UIBarButtonItem *flipButton = [[UIBarButtonItem alloc] initWithTitle: @"Modem" style: UIBarButtonItemStylePlain target: self action: @selector(togglePopover:)];
self.navBar.topItem.rightBarButtonItem = flipButton;

but I get an exception: 'NSInternalInconsistencyException', reason: 'UIStoryboardPopoverSegue must be presented from a bar button item or a view.' I'm pretty sure this is because I don't have an anchor set for the popOver segue. The button doesn't exist in the storyboard, so I can't set it there. And I can't seem to find an API to set it at run time.

I also tried creating the button in IB, but not in the view hierarchy, and then just setting the rightBarButtonItem property to my existing button. That also works, but I still can't set that button as the anchor for the popover view. I can set the Navigation Bar as the anchor, but that makes it anchor to the title in the nav bar, which looks silly.

Any ideas?

Answer 1

I had the same problem and solved it by creating a UIBarButtonItem in the Storyboard for the view controller but not part of the view hierarchy.

In IB, Drag a bar button item to the dark bar below the view controller view, drop it next to the "First Responder" and "View Controller" icons. Create a (strong) IBOutlet for it. Then create a popover segue from it to the destination view controller by dragging from the bar button item to the destination. It seems like this is the only way to set it as the anchor. Choosing it as the anchor for an existing segue does not work (looks like an IB bug).

In viewDidLoad you can assign this bar button item to the navigationItem (or where ever you like) and the segue works as expected.