SwiftUI .fileImporter在真实iPhone设备上无法正常工作的问题

SwiftUI的.fileImporter功能已出现问题长达一年：该功能在iPhone模拟器、Mac Catalyst及真实iPad设备上均能正常工作，但在真实iPhone设备测试时，文件选择器无法选中文件，弹窗完全无法关闭，回调函数也不会触发。而使用UIKit的UIDocumentPickerViewController时，无论在Mac Catalyst、模拟器、iPad还是真实iPhone上，所有功能均正常运行。

复现步骤 #

• 创建一个基于SwiftUI的新Xcode项目。
• 替换ContentView.swift中的代码为以下内容：

import SwiftUI

struct ContentView: View {
    @State var sShowing = false
    @State var uShowing = false
    
    @State var showAlert = false
    @State var alertText = ""
    var body: some View {
        VStack {
            VStack {
                Button("Test SWIFTUI") {
                    sShowing = true
                }
            }
            .fileImporter(isPresented: $sShowing, allowedContentTypes: [.item]) {result in
                alertText = String(describing: result)
                showAlert = true
            }
            VStack {
                Button("Test UIKIT") {
                    uShowing = true
                }
            }
            .sheet(isPresented: $uShowing) {
                DocumentPicker(contentTypes: [.item]) {url in
                    alertText = String(describing: url)
                    showAlert = true
                }
            }
            .padding(.top, 50)
        }
        .padding()
        .alert(isPresented: $showAlert) {
            Alert(title: Text("Result"), message: Text(alertText))
        }
    }
}

• 创建新文件DocumentPicker.swift，并粘贴以下代码：

import SwiftUI
import UniformTypeIdentifiers

struct DocumentPicker: UIViewControllerRepresentable {
    let contentTypes: [UTType]
    let onPicked: (URL) -> Void

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

    func makeUIViewController(context: Context) -> UIDocumentPickerViewController {
        let documentPicker = UIDocumentPickerViewController(forOpeningContentTypes: contentTypes, asCopy: true)
        documentPicker.delegate = context.coordinator
        documentPicker.modalPresentationStyle = .formSheet
        return documentPicker
    }

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

    class Coordinator: NSObject, UIDocumentPickerDelegate {
        var parent: DocumentPicker

        init(_ parent: DocumentPicker) {
            self.parent = parent
        }

        func documentPicker(_ controller: UIDocumentPickerViewController, didPickDocumentsAt urls: [URL]) {
            print("Success!", urls)
            guard let url = urls.first else { return }
            parent.onPicked(url)
        }

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

• 在Mac Catalyst上运行项目，确认功能正常。
• 在真实iPhone设备上测试，即可复现问题。

内容的提问来源于stack exchange，提问作者NitroRX