Popovers cannot be presented from a view which does not have a window

Question

What does this error indicate:

\"Popovers cannot be presented from a view which does not have a window.\"

Answer 1

I received the same error message when assigning the same UIBarButtonItem to multiple navigation items as did Lewis. My example was slightly more complicated as I was using a UISplitViewController.

In my RootViewController I have an array of arrays to accomplish multiple sections within my table. Each time that the user clicks a row in the table, a new "detail" view controller is placed in the right pane of my splitViewController. Prior to setting the leftBarButtonItem = nil, I would receive a segfault after 3-4 clicks of the "Menu" button with the same error as a111. I updated my code to actually retrieve the previous detail view controller and set the leftBarButtonItem item to nil.

allData is my NSMutableArray that contains several other NSMutableArrays as objects.

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {

    // Retrieve the new detail view controller
    UIViewController *detailViewController = [[self.allData objectAtIndex:indexPath.section] objectAtIndex:indexPath.row];

    // Add the detail view controller to a navigation controller and set the bar style
    UINavigationController *detailNavigationController = [[UINavigationController alloc] initWithRootViewController:detailViewController];
    detailNavigationController.navigationBar.barStyle = [[NSUserDefaults standardUserDefaults] integerForKey:@"UIBarStyle"];

    // Retrieve previous detail view controller and remove the leftBarButtonItem
    UINavigationController *previousDetailNavigationController = [splitViewController.viewControllers objectAtIndex:1];
    UIViewController *previousDetailViewController = [[previousDetailNavigationController viewControllers] lastObject];
    previousDetailViewController.navigationItem.leftBarButtonItem = nil;

    // Update the split view controller's view controllers array.
    NSArray *viewControllers = [[NSArray alloc] initWithObjects:self.navigationController, detailNavigationController, nil];
    splitViewController.viewControllers = viewControllers;

    [detailNavigationController release];
    [viewControllers release];

    // Dismiss the popover if it's present.
    if (popoverController != nil) {
        [popoverController dismissPopoverAnimated:YES];
    }

    // This sets the left bar to nil when in landscape and equal to "Menu" when in portrait.
    // We need to remove rootPopoverButtonItem from the previous viewController...
    detailViewController.navigationItem.leftBarButtonItem = rootPopoverButtonItem;
} 

The error message was slightly deceiving at first but the answers above helped me out. I wonder why I could click the "Menu" button up to 3-4 different times before the segfault... I'll investigate further.