json - 我有一些关于 JSONSerialization.jsonObject 的问题(带有 : dataResponse, 选项 : . allowedFragments)

Question

1. 我有一个关于
的问题

let jsonResponse = try JSONSerialization.jsonObject (with: dataResponse, options: .allowFragments)
print ("jsonResponse ==> (jsonResponse)")

我想改变这个值jsonResponse ==> jsonArray 但值没有发送到 jsonArrayjsonArray ==> jsonDictionary

然后使用 JSON 字典来检查下一步登录...

我还有更多错误

guard let jsonDictionary: Dictionary = jsonArray [0] else {==> Have warning = Non-optional expression of type '[String: Any]' used in a check for optionals
   return
} // guard
print ("jsonDictionary ==> (jsonDictionary)")

如果我改变

- JSONSerialization.jsonObject (with: dataResponse, options: [])

出现错误“JSON 文本未以数组或对象开头，并且未设置允许片段的选项。”

//  function check Authen
    func checkAuthen(truckNo: String, pass: String, imei: String) -> Void {
        let myconstant = Myconstant()
        let urlcheckLogin = myconstant.jsonGetDataCheckAuthen(pTruckNo: truckNo, pPassword: pass, pIMEI: imei)
        print("urlcheckLogin ==> \(urlcheckLogin)")

        guard let url = URL(string: urlcheckLogin) else {
            return
        }//Guard

//      task
        let task = URLSession.shared.dataTask(with: url){ (data, response, error) in
            guard let dataResponse = data, error == nil else{
                print("Have Error")
                return
            }//guard

            do{
//             read json from API
                let jsonResponse = try JSONSerialization.jsonObject(with: dataResponse, options: .allowFragments)
                print("jsonResponse ==> \(jsonResponse)")

//              change json to array
                guard let jsonArray = jsonResponse as? [[String:Any]] else{
                    return
                }//guard
                print("jsonArray ==> \(jsonArray)")

                guard let jsonDictionary: Dictionary = jsonArray[0] else{
                    return
                }//guard
                print("jsonDictionary ==>\(jsonDictionary)")

//              check  true password for json dictionary
                let truePassword: String = jsonDictionary["Password"] as! String
                print("truePassword ==>\(truePassword)")

                if pass == truePassword{
//                 password incorrect
                    DispatchQueue.main.async {
                        self.performSegue(withIdentifier: "GotoPlanData", sender: self)
                    }//DispatchQueue
                }else{
//                  password incorrect
                    self.showAlert(title: "Password incorrect", message: "Plase try again")
                }//if
            }catch let myerror{
                print(myerror)
//              check display username in database
                print("No have user \(truckNo) in database")
                DispatchQueue.main.async {
                    self.showAlert(title: "No username", message: "No have user \(truckNo) in database")
                }//DispatchQueue
            }//catch
        }//task
        task.resume()
    }//checkAuthen

结果

No Space
urlcheckLogin ==> http://www.testservice.com/Service/CheckUserLogin/60-7625/1234/355750067867310
username ==> Optional("60-7625")
password ==> Optional("1234")
jsonResponse ==> [{ "Result": "Valid",    "TruckNo": "60-7625",    "TruckID": "10"  }]

Answer 1

问题在于数据以 JSON 字符串的形式发送，显式用双引号引起来，这是非常不寻常的。

如果数据以双引号开头，则必须删除第一个和最后一个字节

let trimmedData : Data 
if dataResponse.first == 0x22 {
   trimmedData = dataResponse.dropFirst().dropLast()
} else {
   trimmedData = dataResponse
}
guard let jsonResponse = try JSONSerialization.jsonObject(with: trimmedData) as? [[String:Any]] else { return }
print("jsonResponse ==> \(jsonResponse)")