Usted buscó: backgroundimage (Inglés - Ruso)

to render the background image, the component’s public interface will have a special backgroundimage property of the uiimage class.
Для передачи фонового изображения в публичном интерфейсе компонента будет специальное свойство — backgroundimage класса uiimage.

if the background has been set, it is sensible to see whether we have gone beyond the backgroundimage. after all, we do not want users to see a truncated image as it looks unnatural.
Если задний фон задан, то имеет смысл проверять, не вышли ли мы за пределы изображения backgroundimage. Ведь нам вовсе не хочется, чтобы пользователи созерцали «обрыв» изображения, это выглядит неестественно.

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