Swift FileManager.default.copyItem(at: URL, to: URL)文件夹权限错误

Question

我正在编写一个小型 Mac OS X 桌面应用程序，它将文件的随机样本从源文件夹复制到目标文件夹，请参阅 https://github.com/belovachap/Select-Random-Files-Mac/blob/主/选择%20Random%20Files/ContentView.swift

目前给我带来最大麻烦的代码是 FileManager.default.copyItem 方法。即使我在文档目录中选择对我的用户似乎具有读/写权限的文件夹，我也会收到错误“无法复制，因为您无权访问”。

这是相关代码

//
//  ContentView.swift
//  Select Random Files
//
//  Created by Chapman on 6/29/24.
//

import SwiftUI

struct ContentView: View {
    @State var sourceFolder: URL? = nil
    @State var destinationFolder: URL? = nil

    var body: some View {
        VStack {
            Button("Choose Source Folder") {
                self.selectSourceFolder()
            }
            Button("Choose Destination Folder") {
                self.selectDestinationFolder()
            }
            Image(systemName: "globe")
                .imageScale(.large)
                .foregroundStyle(.tint)
            Button(action: {
                var files = [URL]()
                if let enumerator = FileManager.default.enumerator(at: sourceFolder!, includingPropertiesForKeys: [.isRegularFileKey], options: [.skipsHiddenFiles, .skipsPackageDescendants]) {
                    for case let fileURL as URL in enumerator {
                        do {
                            let fileAttributes = try fileURL.resourceValues(forKeys:[.isRegularFileKey])
                            if fileAttributes.isRegularFile! {
                                files.append(fileURL)
                            }
                        } catch { print(error, fileURL) }
                    }
                    print(files)
                }
                files = Array(files.shuffled().prefix(3))
                for f in files {
                    let dst = destinationFolder!.appendingPathComponent(f.lastPathComponent)
                    do { try FileManager.default.copyItem(at: f, to: dst)
                    } catch { print(error, f) }
                }
            }, label: {
                Text("Copy")
            })
        }
        .padding()
    }
    
    func buildFolderPicker() -> NSOpenPanel {
        let folderChooserPoint = CGPoint(x: 0, y: 0)
        let folderChooserSize = CGSize(width: 500, height: 600)
        let folderChooserRectangle = CGRect(origin: folderChooserPoint, size: folderChooserSize)
        let folderPicker = NSOpenPanel(contentRect: folderChooserRectangle, styleMask: .utilityWindow, backing: .buffered, defer: true)
        
        folderPicker.canChooseDirectories = true
        folderPicker.canChooseFiles = true
        folderPicker.allowsMultipleSelection = true
        folderPicker.canDownloadUbiquitousContents = true
        folderPicker.canResolveUbiquitousConflicts = true
        return folderPicker
    }

    func selectSourceFolder() {
        let folderPicker = buildFolderPicker()
        folderPicker.begin { response in
            if response == .OK {
                sourceFolder = folderPicker.url
            }
        }
    }
    
    func selectDestinationFolder() {
        let folderPicker = buildFolderPicker()
        folderPicker.begin { response in
            if response == .OK {
                destinationFolder = folderPicker.url
            }
        }
    }
}

struct ContentView_Previews: PreviewProvider {
    static var previews: some View {
        ContentView()
    }
}

以及单击“复制”按钮的屏幕截图，其中包含有关权限错误的控制台输出：

我已经尝试用谷歌搜索这个问题，但似乎没有很多解决我的问题的示例。

Answer 1

我们想通了！！我只设置了只读权限，需要读写！这是解决所有问题的行：https://github.com/belovachap/Select-Random-Files-Mac/blob/main/Select%20Random%20Files/Select_Random_Files.entitlements#L7