Question

我想将JSON中的响应保存在文件中，并在网络不可用时从中获取。然而，在试图通过禁用wifi获取想法时，应用程序总是崩溃。除了保存在数据库中之外，还有其他方法可以在swift中进行脱机提取吗？

这是我得到的错误：无法将'Swift._NSContiguousString'（0x109e22320）类型的值转换为'NSArray'

这是我到目前为止所做的：

创建模型

class func loadSavedFile(fileName: String) -> AnyObject? {
    let pathString: String = Utility.fetchFilePathString(fileName)
    print("Here the pathString is \(pathString)")
    if NSFileManager.defaultManager().fileExistsAtPath(pathString) {
        return NSKeyedUnarchiver.unarchiveObjectWithFile(pathString)!
    } else {
        return "File doesn't exist"
    }
    return ""
}

class func saveObject(object: AnyObject, toFile fileName: String) {
    let pathString: String = Utility.fetchFilePathString(fileName)
    NSKeyedArchiver.archiveRootObject(object, toFile: pathString)
}

class func fetchFilePathString(fileName: String) -> String {
    let pathAray: [AnyObject] = NSSearchPathForDirectoriesInDomains(.DocumentDirectory,.AllDomainsMask, true)
    let pathString = pathAray.last!
    return NSURL(fileURLWithPath: pathString as! String).URLByAppendingPathComponent(fileName).absoluteString
}

从文件中保存和加载数据的代码

var directoryArr  = [Directory]()
override func viewDidLoad() {

    super.viewDidLoad()

    if Utility.isNetworkReachable() {
        Utility.saveObject([], toFile: Constants.File.kDirectory)
        self.serviceCallDirectory()
    } else {
        self.directorie = (Utility.loadSavedFile(Constants.File.kDirectory) as? [Directory])!
        self.tableView.reloadData()
    }

在视图控制器中检查网络连接

func serviceCallDirectory() -> Void {
    let stringUrl = Constants.baseUrl + Constants.kDirectoryUrl
    WebService.getRequestAPI(stringUrl, withSuccess:  {(responseDic, Statusflag,error) in
        if Statusflag {
            self.tableView.backgroundColor = UIColor.clearColor()
            self.tableView.hidden = false

            let tempInfo = responseDic![Constants.kData] as! [AnyObject]
            var imgthumbnail : String = ""
            var imgmedium : String = ""
            var imglarge : String = ""
            var name  : String = ""
            var child : String = ""
            if tempInfo.count != 0 {
                for info in tempInfo {
                    let tid = info[Constants.Directory.tid] as! String
                    let vid = info[Constants.Directory.vid] as! String
                    if let names = info[Constants.Directory.kName] as? String {
                        name = names
                    }
                    if let childs = info[Constants.Directory.kChild] as? String {
                        child = childs
                    }


                    if let imgthumb = info[Constants.Directory.kImageThumbnail] as? String {

                        imgthumbnail = imgthumb
                    } else {
                        imgthumbnail = ""
                    }
                    if let imgmediumd = info[Constants.Directory.kImageMedium] as? String {

                        imgmedium = imgmediumd
                    } else {
                        imgmedium = ""
                    }


                    if let imglarges = info[Constants.Directory.kImageLarge] as? String {
                        imglarge = imglarges
                    }


                    let myModel = Directory(

                        data: tempInfo,
                        tid: tid,
                        vid: vid,
                        name: name,
                        imgThumbnail: imgthumbnail,
                        imgMedium: imgmedium,
                        imgLarge: "",
                        child: child

                    )


                    self.directorie.append(myModel)
                }

服务电话

await Task.Run(async () =>
{
    await DoAsyncMethodAsync();
});

Answer 1

我不知道这是唯一的问题，但这段代码

class func loadSavedFile(fileName: String) -> AnyObject? {
    let pathString: String = Utility.fetchFilePathString(fileName)
    print("Here the pathString is \(pathString)")
    if NSFileManager.defaultManager().fileExistsAtPath(pathString) {
        return NSKeyedUnarchiver.unarchiveObjectWithFile(pathString)!
    } else {
        return "File doesn't exist"
    }
    return ""
}

返回对象或字符串。这不是很明智。它应返回成功标志或元组或使用完成块。当你调用这个函数时，你的代码希望得到一个目录数组，在许多情况下都不会发生

self.directorie = (Utility.loadSavedFile(Constants.File.kDirectory) as? [Directory])!

您的问题中的错误表示不同类型的数据不匹配。你应该尽量不要使用AnyObject，快速帮助你键入检查你正在做什么......

如何在swift中保存和获取文件中的数据？

1 个答案: