swift/Xcode - 导出多个 json 文件

Question

以下代码适用于在按下按钮“导出文档 1”后导出一个 json 文件（如图所示 document1.json 的文件名）。但是在添加第二个文件 document2.json 之后按钮“Export Document2”，无论按下哪个按钮，每次它只导出第一个文档（document1.json）。我是 DocumentInteraction 的新手，任何帮助都会提前表示感谢。这是代码。谢谢。

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) }
}

Answer 1

当您通过按下按钮将 isExportingDocument 设置为 true 时，会为每个按钮触发后台任务。他们需要有不同的状态来控制它们。

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
                                                     ))
        }
    }
}

swift/Xcode - 导出多个 json 文件

swift/Xcode - export multiple json files

xcode

export

file

swift