Mac Catalyst 的 UIDocumentPickerViewController 配置

Question

将 UIDocumentPickerViewController 与 Mac Catalyst 一起使用时，是否需要额外的功能、权限或沙盒配置？我错过了警告吗？

运行以下代码在带有 Catalyst 的 macOS (11.4) 上，选择文件时永远不会调用 didPickDocumentsAt: 委托函数。但是，如果关闭选择器或尝试打开文件，则会调用 documentPickerWasCancelled。

我最初怀疑是由于 SwiftUI 的 View 结构重建导致的不正确的内容类型或委托解除分配，但是当调用 as cancel 时，我怀疑不是。

需要注意的是，在为 macOS 配置 UIDocumentPickerViewController 时，asCopy 必须为 false，但为 iOS 配置 true。

该错误表示沙盒权限错误：

DocumentPickerSwiftUI[42570:1472986] Failed to create an FPSandboxingURLWrapper for file:///Users/ed/test_file.txt. Error: Error Domain=NSPOSIXErrorDomain Code=1 "couldn't issue sandbox extension com.apple.app-sandbox.read-write for '/Users/ed/test_file.txt': Operation not permitted" UserInfo={NSDescription=couldn't issue sandbox extension com.apple.app-sandbox.read-write for '/Users/ed/test_file.txt': Operation not permitted}

当前能力配置（用户选择文件的只读权限）：

import SwiftUI
import UIKit
import UniformTypeIdentifiers

struct ContentView: View {
    @State var showDocumentPicker: Bool = false

    var body: some View {
        documentPickerButton
    }

    private var documentPickerButton: some View {
        Button(action: {
            showDocumentPicker.toggle()
        }, label: {
            Text("Open")
        })
        .sheet(isPresented: self.$showDocumentPicker) {
            AudioFilePicker()
        }
    }
}

final class AudioFilePicker: UIViewControllerRepresentable {

    var viewController = UIDocumentPickerViewController(forOpeningContentTypes: [.item], asCopy: false)

    class Coordinator: NSObject, UIDocumentPickerDelegate {

        var parent: AudioFilePicker

        init(parent: AudioFilePicker) {
            self.parent = parent
        }

        func documentPicker(_ controller: UIDocumentPickerViewController, didPickDocumentsAt urls: [URL]) {
            print("Picker Loaded: \(String(describing: urls.first?.absoluteString))")
            // Do something with URL (never called)
        }

        func documentPickerWasCancelled(_ controller: UIDocumentPickerViewController) {
            print("Picker Cancelled")
        }
    }

    func makeCoordinator() -> Coordinator {
        return Coordinator(parent: self)
    }

    func makeUIViewController(context: Context) -> UIDocumentPickerViewController {
        viewController.delegate = context.coordinator
        return viewController
    }

    func updateUIViewController(_ uiViewController: UIDocumentPickerViewController, context: Context) { }
}

Answer 1

该错误确实表明存在权限错误。尝试添加：

<key>com.apple.security.files.user-selected.read-write</key>
<true/>

Mac Catalyst 的 UIDocumentPickerViewController 配置

UIDocumentPickerViewController configuration for Mac Catalyst

macos

swiftui

appstore-sandbox

mac-catalyst

uidocumentpickerviewcontroller