如何在启用 App Sandbox 的情况下逐行读取文件？

如何解决如何在启用 App Sandbox 的情况下逐行读取文件？

我必须逐行读取一个文件，所以我确保我可以选择一个文件，然后通过传递路径调用一个函数来读取它。

但我收到以下错误：

An error took place: Error Domain=NSCocoaErrorDomain Code=260 "The file “30.160625.txt”
 Couldn’t be opened because there is no such file." 
UserInfo={NSFilePath=/Users/nameUser/Downloads/ask%20us/30.160625.txt,NSUnderlyingError=0x600002a68cc0 {Error Domain=NSPOSIXErrorDomain Code=2 "No such file or directory"}}

我启用了应用沙盒，因为应用商店不接受禁用的应用。

有人可以帮我吗？

import SwiftUI

struct ContentView: View {
    @State var path = "/Users/Documents"
    
    func readFile(){
        do {
            let contentFromFile = try Nsstring(contentsOfFile: path,encoding: String.Encoding.utf8.rawValue)
            print(contentFromFile)
        }catch let error as NSError {
            print("An error took place: \(error)")
        }
    }
    
    var body: some View {
        vstack{
            TextField("Path",text: $path)
                .padding(.vertical,8)
                .padding(.horizontal,8)
                .padding(.leading,22)
                .padding(.trailing,22)
                .cornerRadius(8)
                .textFieldStyle(PlainTextFieldStyle())
                .overlay(
                    HStack{
                        Button(action: {
                            let panel = NSOpenPanel()
                            let launcherLogPathWithTilde = path as Nsstring
                            let expandedLauncherLogPath = launcherLogPathWithTilde.expandingTildeInPath
                            panel.directoryURL = NSURL.fileURL(withPath: expandedLauncherLogPath,isDirectory: true)
                            panel.allowsMultipleSelection = false
                            panel.canChooseDirectories = false
                            panel.canChooseFiles = true
                            if panel.runModal() == .OK {
                                self.path = panel.url?.absoluteString.replacingOccurrences(of: "file://",with: "") ?? "<none>"
                                readFile()
                            }
                        }){
                            Image(systemName: "folder.fill")
                                .frame(maxWidth: .infinity,alignment: .leading)
                                .foregroundColor(.gray)
                                .padding(.leading,8)
                        }
                        .buttonStyle(PlainButtonStyle())
                    }
                )
        }
        .frame(width: 500,height: 200)
    }
}

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

编辑： 似乎有效，您觉得如何？

func readFile(){
        let url = URL(fileURLWithPath: path)
        do {
            //var row: Subtitle = Subtitle()
            var number: Int = 0
            var start: String = ""
            var end: String = ""
            var text: String = ""
            
            try String(contentsOf: url,encoding: .utf8)
                .split(separator: "\n")
                .forEach { line in
                    let n = Int(line)
                    if n != nil {
                        number = n!
                    } else if(line.contains("-->")){
                        print(line)
                        let matched = matches(for: "[0-9]+:[0-9]+:[0-9]+,[0-9]+",in: String(line))
                        print(matched)
                        start = matched[0]
                        end = matched[1]
                        //print("Time: \(line)")
                    } else {
                        text = String(line)
                        let row = Subtitle(number: number,start: start,end: end,text: text)
                        arrayS.append(row)
                    }
                }
        } catch let error as NSError {
            print("An error took place: \(error)")
        }
    }

解决方法

不要使用在 SandBox 中不正确的硬编码路径，而是使用通过 NSFileManager API 检索所需域的 URL（在您的情况下为用户）

    /* -URLForDirectory:inDomain:appropriateForURL:create:error: is a URL-based replacement for FSFindFolder(). It allows for the specification and (optional) creation of a specific directory for a particular purpose (e.g. the replacement of a particular item on disk,or a particular Library directory.
     
        You may pass only one of the values from the NSSearchPathDomainMask enumeration,and you may not pass NSAllDomainsMask.
     */
    @available(iOS 4.0,*)
    open func url(for directory: FileManager.SearchPathDirectory,in domain: FileManager.SearchPathDomainMask,appropriateFor url: URL?,create shouldCreate: Bool) throws -> URL

该 API 考虑了沙箱，并提供了有效的 URL，成对的 NSURL.startAccessingSecurityScopedResource 可用于读取相应的文件内容。

另见例如https://stackoverflow.com/a/64975570/12299030