Mac催化剂的UIDocumentPickerViewController配置

Question

当使用UIDocumentPickerViewController时，是否需要额外的功能、权限或沙箱配置？我错过了警告吗？

使用催化剂在macOS (11.4)上运行以下代码，在选择文件时永远不会调用didPickDocumentsAt:委托函数。但是，如果选择器被拒绝或尝试打开文件，则会调用documentPickerWasCancelled。

我最初怀疑由于SwiftUI的View娱乐而导致的不正确的内容类型或委托取消分配，但由于as cancel被调用，我怀疑没有。

确定的一个警告是，asCopy在为macOS配置UIDocumentPickerViewController时必须是macOS，而为iOS配置true时必须是true。

此错误指示沙盒权限错误：

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}

当前功能配置(用户选择的文件的只读访问)：

​

​

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

此错误表示权限错误。试着添加：

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