ios - 无法在 iOS 沙箱中的文档文件夹中创建文件或目录

Question

我正在使用 Xcode(版本 8.2.1) 在 iPad (v10.2.1) 上制作游戏，同时我试图在文档中保存一些数据在沙箱中的文件夹中，我发现我尝试的所有方法都失败了:createDirectory 和 createFile(using file manager)，以及 writeToUrl(using NSData) .我在 2 台 iPad 和 1 台 iPhone 上运行该程序，但没有成功。

我能够从我创建的 plist 中读取，并使用函数 convertDataFrom() 将其转换为字典。

我是数据持久化或文件操作的新手，我的游戏卡在了这里。将不胜感激任何帮助!

func loadData()->NSDictionary{
    let fm = FileManager()

    let sourceUrl = Bundle.main.url(forResource: "Data", withExtension: "plist")!
    var appSupportDir = fm.urls(for: .documentDirectory, in: .userDomainMask).first! as? NSURL
    appSupportDir = appSupportDir!.appendingPathComponent("UserData", isDirectory: true) as NSURL?
    let urlForSave = (appSupportDir!.appendingPathComponent("Data.plist"))!


    //load data, or if file doesn't exist yet, create one
    var isDirectory: ObjCBool = false

    if fm.fileExists(atPath: urlForSave.absoluteString, isDirectory: &isDirectory) {
        let data = convertDataFrom(url: urlForSave)
        print("data file exists")
        print(isDirectory)

        return data as NSDictionary

    } else {
        do { try fm.createDirectory(atPath: appSupportDir!.absoluteString!, withIntermediateDirectories: true, attributes: nil) }catch let Error {
            print("create directory failed")
            print(Error)
        }

        let originalData = NSData.init(contentsOf: sourceUrl)
        print("\(urlForSave)")
        do { try originalData?.write(toFile: urlForSave.absoluteString, options: .atomic) } catch let Error {
            print(Error)
        }
        if (!fm.createFile(atPath: urlForSave.absoluteString, contents: originalData as Data?, attributes: nil)) {
            fatalError("file creation failed")
        }

        let data = convertDataFrom(url: urlForSave)
        print("\(data)")
        print(isDirectory)

        return data as NSDictionary
    }

}

func convertDataFrom(url: URL)->Dictionary<String, Any> {
    let dictionary = NSDictionary.init(contentsOf: url) as! Dictionary<String, Any>
    return dictionary
}

Error messages for "createDirectory": Error Domain=NSCocoaErrorDomain Code=513 "You don’t have permission to save the file “UserData” in the folder “Documents”." UserInfo={NSFilePath=file:///var/mobile/Containers/Data/Application/F7F41E0D-D3F6-489B-A59E-B7AC401EC402/Documents/UserData/, NSUnderlyingError=0x174053f50 {Error Domain=NSPOSIXErrorDomain Code=1 "Operation not permitted"}} file:///var/mobile/Containers/Data/Application/F7F41E0D-D3F6-489B-A59E-B7AC401EC402/Documents/UserData/Data.plist

and for "createFile" (fatalError if createFile fails) Error Domain=NSCocoaErrorDomain Code=4 "The file “Data.plist” doesn’t exist." UserInfo={NSFilePath=file:///var/mobile/Containers/Data/Application/F7F41E0D-D3F6-489B-A59E-B7AC401EC402/Documents/UserData/Data.plist, NSUnderlyingError=0x174055bd0 {Error Domain=NSPOSIXErrorDomain Code=2 "No such file or directory"}} fatal error: file creation failed: file /Users/chanwu/Desktop/Math_DownStairs/Math_DownStairs/

Answer 1

您的代码会检查 urlForSave(最终文件)是否存在，如果不存在，您将尝试创建 UserData 目录。

如果最终文件不存在，但 UserData 目录存在，我希望得到您描述的确切结果。

您可能应该更改测试以查看 UserData 目录是否存在，而不是测试最终文件。这样，如果目录不存在，您将创建它，然后调用 write(toFile:)，如果文件不存在，它将创建该文件。