问题
I'm looking to change the popovers border. It's just a solid flat color, so no image required. Is there a property that I can tap in to, or will I have to subclass?
回答1:
Changing the look of a popover being shown via a UIPopoverController isn't supported. I wouldn't even try, as you may do a lot of work to reverse-engineer UIPopoverController, only to have it break in a subsequent software update.
来源：https://stackoverflow.com/questions/4110089/change-uipopover-background