每次启动/重新运行应用程序时，iOS 文件路径都会发生变化

我在每次启动应用程序时更改文件路径时遇到问题。 我在应用程序包中有一个文件（“AppConstant.json”），我需要将该文件复制到应用程序文档目录中。我成功地将“AppConstant.json”文件保存在文档目录中创建的用户文件夹“MyFolder”中。

但问题是当我第二次重新启动应用程序时，它没有显示相同的路径。我也使用相对路径，但仍然没有得到。

这是代码 // 调用目录

let stringAppConstant = copyFileFromBundleToDocumentDirectory(resourceFile: "AppConstant", resourceExtension: "json")

// 保存或获取退出文件路径

func copyFileFromBundleToDocumentDirectory(resourceFile: String, resourceExtension: String) -> String 
  {
        var stringURLPath = "Error_URLPath"
        let fileManager = FileManager.default
        let docURL = NSSearchPathForDirectoriesInDomains(.documentDirectory, .userDomainMask, true).first!
        let destFolderPath = URL(string:docURL)?.appendingPathComponent("MyFolder")
        let fileName = "\(resourceFile).\(resourceExtension)"
        guard let newDestPath = destFolderPath, let sourcePath = Bundle.main.path(forResource: resourceFile, ofType: ".\(resourceExtension)"), let fullDestPath = NSURL(fileURLWithPath: newDestPath.absoluteString).appendingPathComponent(fileName) else {
            return stringURLPath
        }

       if !fileManager.fileExists(atPath: newDestPath.path) {
            do {
                try fileManager.createDirectory(atPath: newDestPath.path,withIntermediateDirectories: true, attributes: nil)
                print("Created folder successfully in :::", newDestPath.path)
            } catch {
                print("Error in creating folder :::",error.localizedDescription);
            }
        }
        else {
            print("Folder is already exist!")
        }
        if fileManager.fileExists(atPath: fullDestPath.path) {
            print("File is exist in ::: \(fullDestPath.path)")
            stringURLPath = fullDestPath.path
        }
        else {
            do {
                try fileManager.copyItem(atPath:  sourcePath, toPath: fullDestPath.path)
                print("Saved file successfully in :::", fullDestPath.path)
                stringURLPath = fullDestPath.path
            } catch {
                print("Error in creating file ::: \(error.localizedDescription)")
            }
        }
        return stringURLPath
    }

请帮助我，我需要在沙盒中保存路径。这是我实施的正确方法吗？

我在设备和模拟器中运行，重新启动时两条路径不同 这是第一次启动的路径： /var/mobile/Containers/Data/Application/81B568A7-0932-4C3E-91EB-9DD62416DFE8/Documents/MyFolder/AppConstant.json

重新启动应用程序我得到新路径： /var/mobile/Containers/Data/Application/3DAABAC3-0DF5-415B-82A5-72B204311904/Documents/MyFolder/AppConstant.json

注意：我创建了一个示例项目，并使用相同的代码并且它正在工作。但在现有项目中它不起作用。我仅对示例和项目使用相同的包 ID 和配置文件。检查添加的文件参考、设置、版本均相同。

任何想法？

容器路径周期性变化的行为是正常的。

这些行

let destFolderPath = URL(string:docURL)?.appendingPathComponent("MyFolder")
let fileName = "\(resourceFile).\(resourceExtension)"
guard let newDestPath = destFolderPath, let sourcePath = Bundle.main.path(forResource: resourceFile, ofType: ".\(resourceExtension)"), let fullDestPath = NSURL(fileURLWithPath: newDestPath.absoluteString).appendingPathComponent(fileName) else {
    return stringURLPath
}

包含很多错误

• URL(string文件路径的 API 是错误的，它是URL(fileURLWithPath).
• 第二个参数为path(forResource:ofType:)不得有前导点。
• The API absoluteString作为参数是错误的URL(fileURLWithPath
• 不是真正的错误，但不要使用NSURL在斯威夫特.

强烈建议始终使用URL相关 API 用于连接路径并从中获取文档文件夹FileManager。此外，制作该方法是一个很好的做法throw真正的错误而不是返回无意义的文字字符串。和NSSearchPathForDirectoriesInDomains已过时，不应在 Swift 中使用。

func copyFileFromBundleToDocumentDirectory(resourceFile: String, resourceExtension: String) throws -> URL
{
    let sourceURL = Bundle.main.url(forResource: resourceFile, withExtension: resourceExtension)!
    
    let fileManager = FileManager.default
    let destFolderURL = try fileManager.url(for: .documentDirectory, in: .userDomainMask, appropriateFor: nil, create: false).appendingPathComponent("MyFolder")
    let fullDestURL = destFolderURL.appendingPathComponent(resourceFile).appendingPathExtension(resourceExtension)
    
    if !fileManager.fileExists(atPath: destFolderURL.path) {
        try fileManager.createDirectory(at: destFolderURL, withIntermediateDirectories: true, attributes: nil)
        print("Created folder successfully in :::", destFolderURL.path)
        try fileManager.copyItem(at: sourceURL, to: fullDestURL)
        print("Saved file successfully in :::", fullDestURL.path)
    } else {
        print("Folder already exists!")
        if fileManager.fileExists(atPath: fullDestURL.path) {
            print("File exists in ::: \(fullDestURL.path)")
        } else {
            try fileManager.copyItem(at: sourceURL, to: fullDestURL)
            print("Saved file successfully in :::", fullDestURL.path)
        }
    }
    return fullDestURL
}