UIPopoverController placement

I'm working on an app that is supposed to be universal, one app for both iPad and iPhone. I would like to keep their interfaces as similar as possible. In the iPhone app I am using a Tab bar controller, and one of those tabs goes to an image picker controller. Obviously I cannot do that in iPad. So I have hijacked con开发者_如何学运维trol of that button to bring a popupcontroller that has the image picker in it. This all works well enough, except when I bring up the popup, it is not in the correct place. When I rotate the simulator, the popup goes to the correct place, and stays when I rotate back even.

My code is based on the code in this question: Ipad UIImagePickerController and UIPopoverController error

Why would my popup not be in the correct location?

If your code is based on the question you referenced, it would appear you are using the following code to show the popover:

[popoverController presentPopoverFromBarButtonItem:sender
                          permittedArrowDirections:UIPopoverArrowDirectionUp 
                                          animated:YES]

UIPopoverController:presentPopoverFromBarButtonItem:permittedArrowDirections:animated accepts a UIBarButtonItem* for the sender which your UITabBar does not have. UITabBar uses UITabBarItem which has a base of UIBarItem. UIBarButtonItem also has that base (UIBarItem).

Anyhow... I also needed to show a uipopovercontroller from a tabbaritem, I used the following code:

MyViewController *myVC = [[MyViewController alloc] initWithNibName:@"MyViewController" bundle:[NSBundle mainBundle]];
UIPopoverController *popover = [[UIPopoverController alloc] initWithContentViewController:myVC];
[myVC release];
popover.popoverContentSize = myVC.view.frame.size;
popover.delegate = self;
int tabBarItemWidth = self.tabBar.frame.size.width / [self.tabBar.items count];
int x = tabBarItemWidth * 6;
CGRect rect = CGRectMake(x, 0, tabBarItemWidth, self.tabBar.frame.size.height);
[popover presentPopoverFromRect:rect
                         inView:self.tabBar 
       permittedArrowDirections:UIPopoverArrowDirectionUp 
                       animated:YES];

Note: your x calculation will be different. The tab bar item selected for me was the 6th one. Basically

x = tabBarItemWidth * currentTabBarItemIndex;