swift/Xcode-匯出多個json檔案

以下代碼適用于在按下按鈕“Export Document1”后匯出一個 json 檔案（document1.json 的檔案名如圖所示）。但是在添加第二個檔案 document2.json 及其按鈕“Export Document2”后，每次它只匯出第一個檔案（document1.json）無論按下哪個按鈕。我是 DocumentInteraction 的新手，任何幫助都將提前感謝。這是代碼。謝謝。

struct DocumentInteraction: View {
    @State private var isExportingDocument = false
    var body: some View {

        VStack {

            let dir: URL = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask).last! as URL

            let url1 = dir.appendingPathComponent("document1.json")
            
            Button("Export Document1") { self.isExportingDocument = true }
            .background(DocumentInteractionController($isExportingDocument, url: url1))
                                                     
        }
        
        
        VStack {
            let dir: URL = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask).last! as URL
            let url2 = dir.appendingPathComponent("document2.json")
            Button("Export Document2") { self.isExportingDocument = true }
            .background(DocumentInteractionController($isExportingDocument, url: url2
                                                     ))
        }
    }
}

struct DocumentInteraction_Previews: PreviewProvider {
    static var previews: some View { if #available(iOS 14.0, *) {
        DocumentInteraction()
    } else {
        // Fallback on earlier versions
    } }
}

struct DocumentInteractionController: UIViewControllerRepresentable {
    
    fileprivate var isExportingDocument: Binding<Bool>
    fileprivate let viewController = UIViewController()
    fileprivate let documentInteractionController: UIDocumentInteractionController

    init(_ isExportingDocument: Binding<Bool>, url: URL) {
        self.isExportingDocument = isExportingDocument
        documentInteractionController = .init(url: url)
    }

    func makeUIViewController(context: UIViewControllerRepresentableContext<DocumentInteractionController>) -> UIViewController { viewController }

    func updateUIViewController(_ controller: UIViewController, context: UIViewControllerRepresentableContext<DocumentInteractionController>) {
        if isExportingDocument.wrappedValue && documentInteractionController.delegate == nil {
            documentInteractionController.uti = documentInteractionController.url?.typeIdentifier ?? "public.data, public.content"
            documentInteractionController.name = documentInteractionController.url?.localizedName
            documentInteractionController.presentOptionsMenu(from: controller.view.frame, in: controller.view, animated: true)

            documentInteractionController.delegate = context.coordinator
            documentInteractionController.presentPreview(animated: true)
        }
    }

    func makeCoordinator() -> Coordintor { Coordintor(self) }
}

uj5u.com熱心網友回復：

當您通過按下按鈕將 isExportingDocument 設定為 true 時，將為每個按鈕觸發后臺任務。他們需要有不同的狀態來控制它們。

struct DocumentInteraction: View {
    @State private var isExportingDocument1 = false
    @State private var isExportingDocument2 = false
    var body: some View {

        VStack {

            let dir: URL = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask).last! as URL

            let url1 = dir.appendingPathComponent("document1.json")
            
            Button("Export Document1") { self.isExportingDocument1 = true }
            .background(DocumentInteractionController($isExportingDocument1, url: url1))
                                                     
        }
        
        
        VStack {
            let dir: URL = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask).last! as URL
            let url2 = dir.appendingPathComponent("document2.json")
            Button("Export Document2") { self.isExportingDocument2 = true }
            .background(DocumentInteractionController($isExportingDocument2, url: url2
                                                     ))
        }
    }
}

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