ios - 如何在swift中将Data转换为Int

Question

我正在用 Swift 编码。 API返回一个Data，需要转换为Int!我该怎么办？

我需要的响应如下所示::

12345

但是当我打印数据时我得到的想法是:

Optional(5 bytes)

API 返回一个 Int(不是 JSON)

//send HTTP req to register user
        let myUrl = URL(string: "http://app.avatejaratsaba1.com/api/Person/Create")
        var request = URLRequest(url: myUrl!)
        request.httpMethod = "POST" // compose a query string
        request.addValue("application/json", forHTTPHeaderField: "content-type")
        request.addValue("application/json", forHTTPHeaderField: "Accept")

        let postString = ["name" : name.text!,
                          "isLegal" : FinalLegalSegment,
                          "codeMelli" : National_ID.text! ] as [String : Any]


do {
            request.httpBody = try JSONSerialization.data(withJSONObject: postString, options: .prettyPrinted)
        }catch let error {
            print(error.localizedDescription)
            self.DisplayMessage(UserMessage: "1Something went wrong , please try again!")
            return
        }

        let task = URLSession.shared.dataTask(with: request)
        {
            (data : Data? , response : URLResponse? , error : Error?) in

            self.removeActivtyIndicator(activityIndicator: MyActivityIndicator)

            if error != nil
            {
                self.DisplayMessage(UserMessage: "2Could not successfully perform this request , please try again later.")
                print("error = \(String(describing : error))")
                return
            }
            else
            {

                print("////////////////////////////////")
                print("data has been sent")

            }
        }



        task.resume()

Answer 1

可以使用withUnsafeBytes来获取指针并加载整数

let x = data.withUnsafeBytes({

        (rawPtr: UnsafeRawBufferPointer) in
        return rawPtr.load(as: Int32.self)

        })

rawPtr 是不安全的rawbufferpointer，load() 有助于将值返回给x。这可用于获取任何整数。 rawPtr 是一个临时指针，不能在 block 之外使用它。

此功能自 Swift 5 起可用，旧版本已提供

public func withUnsafeBytes<ResultType, ContentType>(_ body: (UnsafePointer<ContentType>) throws -> ResultType) rethrows -> ResultType

已弃用。