Customizing the UIPopoverController view background and border color

iOS 7 onwards, you can change backgroundColor of UIPopoverController which affects the navigation background color as well as arrows of popover.

@property (nonatomic, copy) UIColor *backgroundColor NS_AVAILABLE_IOS(7_0);

Usage example:

    if ([self.popoverVC respondsToSelector:@selector(setBackgroundColor:)]) {   // Check to avoid app crash prior to iOS 7
        self.popoverVC.backgroundColor = [UIColor greenColor];
    }

Note - As of now (iOS 7.0.3), in some cases (like set color using colorWithPatternImage:), the simulator doesn't honor the color but on device it works fine.

Now in iOS 5, popoverBackgroundViewClass is available.