UIPopoverController's view controller gets resized after keyboard disappears

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Had this problem myself recently.

The way I got around it was to observe the keyboard disappearing in the controller which controls the UIPopoverController:

[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(presentSearchPopover) name:UIKeyboardDidHideNotification object:nil];

And then in -presentSearchPopover, present the UIPopoverController again (it’s quite a seamless transition):

- (void)presentSearchPopover
    self.searchPopoverController.popoverContentSize = CGSizeMake(width, height);

    [self.searchPopoverController presentPopoverFromRect:someRect inView:self.view permittedArrowDirections:UIPopoverArrowDirectionUp animated:YES];

Don’t forget to remove the observer in -dealloc or similar too:

- (void)dealloc
    [[NSNotificationCenter defaultCenter] removeObserver:self name:UIKeyboardDidHideNotification object:nil];

    [super dealloc];