SwiftUI Transparent List Wrapper - Works in iOS 14

AppearanceContainer.swift

/// Wraps its content in a HostingViewController that has the backgroundColor of UITableView appearance
/// within it set to .clear, thus working around the issue where SwiftUI Lists always have white backgrounds,
/// without inadvertently affecting the appearance of all UITableViews in the app.
/// Setting the listRowBackground explicitly is still required, setting that to clear won't work.
struct ListAppearanceContainer<Content>: View, UIViewControllerRepresentable where Content: View {
    let content: Content
    
    class AppearanceContainerViewController<Content>: UIHostingController<Content> where Content: View {}
    
    init(_ content: () -> Content) {
        self.content = content()
    }
    
    func makeUIViewController(context: Context) -> AppearanceContainerViewController<Content> {
        let tableView = UITableView.appearance(whenContainedInInstancesOf: [AppearanceContainerViewController<Content>.self])
        tableView.backgroundColor = .clear
        
        let vc = AppearanceContainerViewController(rootView: content)
        vc.view.backgroundColor = .clear
        return vc
    }
    
    func updateUIViewController(_ uiViewController: AppearanceContainerViewController<Content>, context: Context) {
    }
}