DocumentSelectorAppearance
constructor(interfaceStyle: UIDocumentBrowserUserInterfaceStyle = UIDocumentBrowserUserInterfaceStyleLight, leadingNavigationBarButtonItems: List<UIBarButtonItem> = emptyList(), trailingNavigationBarButtonItems: List<UIBarButtonItem> = emptyList(), customActions: List<UIDocumentBrowserAction> = emptyList(), createTitle: String, documentAspectRatio: Double = 2.0 / 3.0, showFileExtensions: Boolean = false)