无法使用类型为“的参数列表”调用“jsonObject”（带有：NSData，选项：JSONSerialization.ReadingOptions，错误：inout NSError？）

Posted 2023-03-14

【中文标题】无法使用类型为“的参数列表”调用“jsonObject”（带有：NSData，选项：JSONSerialization.ReadingOptions，错误：inout NSError？）

【英文标题】：Cannot invoke 'jsonObject' with an argument list of type '(with: NSData, options: JSONSerialization.ReadingOptions, error: inout NSError?)

【发布时间】：2016-12-05 03:47:03

【问题描述】：

我是 ios 的新手开发者，仍在学习 youtube 或阅读一些有关 swift 的电子书等。

实际上，我在 youtube iOS Login and Signup Screen Tutorial 上关注了有关如何使用 JSON 数据创建 iOS 登录和注册的本教程，但我认为该代码在带有 xcode 8 的 swift 3 中效果不佳。我有一些问题/错误，我现在不能解决这个问题，我已经google了，但我不知道如何解决这个问题。

这是我的 LoginVC.swift 文件中的屏幕截图

Screenshot of error on my LoginVC.swift

这是 LoginVC.swift 中的所有代码

import UIKit

class LoginVC: UIViewController 

    @IBOutlet weak var txtUsername: UITextField!
    @IBOutlet weak var txtPassword: UITextField!


    override func viewDidLoad() 
        super.viewDidLoad()

        // Do any additional setup after loading the view.
    

    override func didReceiveMemoryWarning() 
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    

    @IBAction func btnLoginTapped(_ sender: UIButton) 
        // let userName = txtUsername.text;
        // let userPassword = txtPassword.text;

        let username = txtUsername.text
        let password = txtPassword.text

        if ( username!.isEqual("") || password!.isEqual("") ) 

            var alertView:UIAlertView = UIAlertView()
            alertView.title = "Sign in Failed!"
            alertView.message = "Please enter Username and Password"
            alertView.delegate = self
            alertView.addButton(withTitle: "OK")
            alertView.show()
         else 

            var post:NSString = "username=\(username)&password=\(password)" as NSString

            NSLog("PostData: %@",post);

            var url:NSURL = NSURL(string:"http://192.168.1.17/userAPI/api/users")!

            var postData:NSData = post.data(using: String.Encoding.ascii.rawValue)! as NSData

            var postLength:NSString = String( postData.length ) as NSString

            var request:NSMutableURLRequest = NSMutableURLRequest(url: url as URL)
            request.httpMethod = "POST"
            request.httpBody = postData as Data
            request.setValue(postLength as String, forHTTPHeaderField: "Content-Length")
            request.setValue("application/x-www-form-urlencoded", forHTTPHeaderField: "Content-Type")
            request.setValue("application/json", forHTTPHeaderField: "Accept")


            var reponseError: NSError?
            var response: URLResponse?

            var urlData: NSData? = NSURLConnection.sendSynchronousRequest(request, returningResponse:&response, error: &reponseError)

            if ( urlData != nil ) 
                let res = response as! HTTPURLResponse!;
                // let dict: [String: Any] = ["key": value]
                NSLog("Response code: %ld", res?.statusCode ?? <#default value#>);

                if ((res?.statusCode)! >= 200 && (res?.statusCode)! < 300) 
                    var responseData:NSString  = NSString(data:urlData! as Data, encoding:String.Encoding.utf8.rawValue)!

                    NSLog("Response ==> %@", responseData);

                    var error: NSError?

                    let jsonData:NSDictionary = JSONSerialization.jsonObject(with: urlData!, options: JSONSerialization.ReadingOptions.mutableContainers, error: &error) as! NSDictionary

                    // let jsonData:NSDictionary = JSONSerialization.JSONObjectWithData(urlData!, options:JSONSerialization.ReadingOptions.MutableContainers , error: &error) as! NSDictionary

                    let success:NSInteger = jsonData.value(forKey: "success") as! NSInteger

                    //[jsonData[@"success"] integerValue];

                    NSLog("Success: %ld", success);

                    if(success == 1) 
                        NSLog("Login SUCCESS");

                        var prefs:UserDefaults = UserDefaults.standard
                        prefs.set(username, forKey: "USERNAME")
                        prefs.set(1, forKey: "ISLOGGEDIN")
                        prefs.synchronize()

                        self.dismiss(animated: true, completion: nil)
                     else 
                        var error_msg:NSString

                        if jsonData["error_message"] as? NSString != nil 
                            error_msg = jsonData["error_message"] as! NSString
                         else 
                            error_msg = "Unknown Error"
                        
                        var alertView:UIAlertView = UIAlertView()
                        alertView.title = "Sign in Failed!"
                        alertView.message = error_msg as String
                        alertView.delegate = self
                        alertView.addButton(withTitle: "OK")
                        alertView.show()

                    

                 else 
                    var alertView:UIAlertView = UIAlertView()
                    alertView.title = "Sign in Failed!"
                    alertView.message = "Connection Failed"
                    alertView.delegate = self
                    alertView.addButton(withTitle: "OK")
                    alertView.show()
                
             else 
                var alertView:UIAlertView = UIAlertView()
                alertView.title = "Sign in Failed!"
                alertView.message = "Connection Failure"
                if let error = reponseError 
                    alertView.message = (error.localizedDescription)
                
                alertView.delegate = self
                alertView.addButton(withTitle: "OK")
                alertView.show()
            
        


    

    func textFieldShouldReturn(textField: UITextField) -> Bool
       //delegate method
        textField.resignFirstResponder()
        return true
    

 

错误实际上在以下几行：

var urlData: NSData? = NSURLConnection.sendSynchronousRequest(request, returningResponse:&response, error: &reponseError)

NSLog("Response code: %ld", res?.statusCode ?? <#default value#>);

let jsonData:NSDictionary = JSONSerialization.jsonObject(with: urlData!, options: JSONSerialization.ReadingOptions.mutableContainers, error: &error) as! NSDictionary

我有点卡住并困惑如何解决这个问题。

有人来帮忙解决这个问题吗？对此，我真的非常感激。或者有人可以告诉我如何在 Swift3 中使用 API 学习和创建登录屏幕？

谢谢你的帮助，祝大家今天有好事发生！

【问题讨论】：

是的，iOS 在 swift 3 中改变了很多语法。只需检查 XCode 显示错误的方法。

Swift 更改语法。将该方法更改为最新的语法类 func jsonObject(with data: Data, options opt: JSONSerialization.ReadingOptions = []) throws -> Any

@New16 谢谢你这么快回复我，呵呵..是的，错误在截图上，实际上我构建项目后有3个错误。

@GeneCode 好的，先生，我会尝试更改，谢谢您的帮助。 :)

【参考方案1】：

这是因为我们在获取数据时没有处理错误。所以我们需要安全地键入种姓数据，然后将其传递给 JsonSerializer。这是代码。

        do 
            let data = try NSData.init(contentsOfFile: path) as Data
            let jsonArray = try JSONSerialization.jsonObject(with: data, options: .mutableContainers)
            print(jsonArray)
         catch