Fix actionSheet position for iPad

[solilin]

There's an issue in the MenuComponent Demo on iPads. When clicking on menu icons, the app crashes with the following error:

Terminating app due to uncaught exception 'NSGenericException', reason: 'Your application has presented a UIAlertController (<UIAlertController: 0x106808800>) of style UIAlertControllerStyleActionSheet from UINavigationController (<UINavigationController: 0x10780aa00>). The modalPresentationStyle of a UIAlertController with this style is UIModalPresentationPopover. You must provide location information for this popover through the alert controller's popoverPresentationController. You must provide either a sourceView and sourceRect or a barButtonItem.  If this information is not known when you present the alert controller, you may provide it in the UIPopoverPresentationControllerDelegate method -prepareForPopoverPresentation.

We need to specify the position for iPads

[joemasilotti]

Thanks for this! This looks to fix the issue for the Overflow Menu example but remains broken for the Menu example. Do you have appetite to address that, too?

[solilin]

@joemasilotti, thanks for the comment. While I'm unsure if it's a good solution, I've still implemented it. If there's no rightBarButtonItem, then we open the popover in the center.

[joemasilotti]

Excellent! Thanks for your contribution @solilin.