As I searched on Google, several users asked this question before, but no one answered, for example:
UIDocumentInteractionController - change background color and prevent status popup
It seems some people like me really hope to find out what we can do to change the background color of the documentController when it enters full screen mode. Now the default is black. The fact is that UIDocumentInteractionController is not a subclass of UIViewController, but a subclass of NSObject, which makes it impossible to directly access the "view" property.
So, I hope to find out what can be done to change the background color?
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