Returns the background image for the scope bar button in a given state.
- iOS 5.0+
- tvOS 9.0+
A control state.
The background image for the scope bar button in
If the background image is an image returned from
UIImage), the cap widths are calculated from that information, otherwise, the cap width is calculated by subtracting one from the image’s width then dividing by 2. The cap widths are used as the margins for text placement. To adjust the margin use the margin adjustment methods.