I am trying to use UIDocumentInteractionController in swiftUI using UIViewControllerRepresentable. My code works fine but I want to add pencil functionality to my app. I wanna be able to draw over image using pencil or finger. When you open an image in files app you get that pencil button on top right corner. I am using UIDocumentInteractionController which only gives done button and share button on the top. I want to know if files app using the same thing for opening images. If Yes, how to enable that pencil button ? and if No, then what is it that files app using to open images ?

Thank You!

UIViewControllerRepresentable

struct UIDocumentInteractionControllerWrapper: UIViewControllerRepresentable {
    private var isActive: Binding<Bool>
    private let docController: UIDocumentInteractionController
    
    private let viewController = UIViewController()
    
    internal init(isActive: Binding<Bool>, url: URL) {
        self.isActive = isActive
        self.docController = UIDocumentInteractionController(url: url)
    }
    
    func makeUIViewController(context: Context) -> UIViewController {
        return viewController
    }
    
    func updateUIViewController(_ uiViewController: UIViewController, context: Context) {
        
        if self.isActive.wrappedValue && docController.delegate == nil {
            docController.delegate = context.coordinator
            self.docController.presentPreview(animated: true)
        }
    }
    
    func makeCoordinator() -> Coordinator {
        return Coordinator(self)
    }
    
    final class Coordinator: NSObject,UIDocumentInteractionControllerDelegate {
        let parent: UIDocumentInteractionControllerWrapper
        
        init(_ parent: UIDocumentInteractionControllerWrapper) {
            self.parent = parent
        }
        
        func documentInteractionControllerViewControllerForPreview(_ controller: UIDocumentInteractionController) -> UIViewController {
            return parent.viewController
        }
        
        func documentInteractionControllerDidEndPreview(_ controller: UIDocumentInteractionController) {
            controller.delegate = nil
            parent.isActive.wrappedValue = false
        }
    }
}

My app

Apple's files app

CodePudding user response：

It is QLPreviewController on second screenshot,

see test module here for how to integrate it.

Also this my post about integration with UINavigationController might be helpful

And this one