如何修复 JSON 不填充我的 UITableView？

Posted 2023-03-04

【中文标题】如何修复 JSON 不填充我的 UITableView？

【英文标题】：How do I fix JSON not populating my UITableView?

【发布时间】：2017-02-02 21:50:04

【问题描述】：

我遇到了这个问题。我已经尝试过这些URL1 和URL2 以获得指导，但没有成功。如何修复未填充我的UITableView 的 JSON？我在让我的阵列在 TableView 中禁用时遇到问题。

这是我的代码：

    class FilmsViewController: UIViewController, UITableViewDataSource, UITableViewDelegate 
        weak var tableView : UITableView!
        var FilmArray = [String]()

        let film_url = "https://www.testing.com/api/resources/films/1"
        func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int 
            return 1
        
        func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell 
            // Getting the right element
            //let films = FilmArray[indexPath.row]


            // Instantiate a cell
            //let cell = UITableViewCell(style: .subtitle, reuseIdentifier: "moviecell")
            let cell = tableView.dequeueReusableCell(withIdentifier: "cell") as! FilmsAPITableViewCell
            //        cell.movieTitle.text = FilmArray[indexPath.row]
            // Adding the right informations
            cell.movieTitle.text = FilmArray[indexPath.row]
            // Returning the cell
            return cell
        
       // @IBOutlet weak var FilmsView: UITableView!
    //    weak var tableView : UITableView!
    //    var FilmArray = [String]()
    //  
    //    let film_url = "https://www.distribber.com/api/resources/films/1"
    //    
        override func viewDidLoad() 
            super.viewDidLoad()

            let tableView = UITableView (frame:view.bounds)
            view.addSubview(tableView)
            self.tableView = tableView

            tableView.dataSource = self
            tableView.delegate = self


    //        func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int 
    //            return 1
    //        
    //            func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell 
    //                // Getting the right element
    //               //let films = FilmArray[indexPath.row]
    //                
    //                
    //                // Instantiate a cell
    //                //let cell = UITableViewCell(style: .subtitle, reuseIdentifier: "moviecell")
    //                let cell = tableView.dequeueReusableCell(withIdentifier: "cell") as! FilmsAPITableViewCell
    //                //        cell.movieTitle.text = FilmArray[indexPath.row]
    //                // Adding the right informations
    //                cell.movieTitle.text = FilmArray[indexPath.row]
    //                // Returning the cell
    //                return cell
    //        
               // 

            //



            let url:URL = URL(string: film_url)!
            let session = URLSession.shared

            let request = NSMutableURLRequest(url: url)
            request.httpMethod = "GET"
            request.setValue("masked", forHTTPHeaderField: "X-API-KEY")
            request.setValue("masked=", forHTTPHeaderField: "Authorization")
            request.cachePolicy = NSURLRequest.CachePolicy.reloadIgnoringCacheData
            let paramString = ""


            //        for (key, value) in post_data
            //        
            //            paramString = paramString + (key as! String) + "=" + (value as! String) + "&"
            //        
            //
            request.httpBody = paramString.data(using: String.Encoding.utf8)

            let task = session.dataTask(with: request as URLRequest, completionHandler: 
                (
                data, response, error) in

                guard let _:Data = data, let _:URLResponse = response  , error == nil else 

                    return
                



                let json: Any?

                do
                
                    json = try JSONSerialization.jsonObject(with: data!, options: [])

                   //  Prasing JSON
                    var parsedData = try JSONSerialization.jsonObject(with: data!, options: []) as! [String:Any]
                     print(parsedData)
                    if let FilmArray = parsedData["films"] as? NSArray 
                        for movieTitle in FilmArray
                            if let filmDict = movieTitle as? NSDictionary
                                if let film = filmDict.value(forKey: "title") 
                                self.FilmArray.append(film as! String)
                                

                                //OperationQueue.main.addOperation(
                                  //self.FilmsView.reloadData()
                               // )

                            
                        

                    
                  print("Hello")
                   print(self.FilmArray)
                
                catch
                
                    return
                

                guard let server_response = json as? NSDictionary else
                
                    return
                


                if let data_block = server_response["data"] as? NSDictionary
                
                    if let session_data = data_block["session"] as? String
                    
                        //  self.login_session = session_data

                        let preferences = UserDefaults.standard
                        preferences.set(session_data, forKey: "session")

                        //  DispatchQueue.main.async(execute: self.LoginDone)
                    
                



            )

            task.resume()

            // Do any additional setup after loading the view.
        
    override func didReceiveMemoryWarning() 
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    

["status": 1, "films": <__NSSingleObjectArrayI 0x7ae40320>(

    Stores =     (
                
            Assets =             (
                                
                    "asset_name" = Screener;
                    "asset_status" = Needed;
                ,
                                
                    "asset_name" = Feature;
                    "asset_status" = Needed;
                ,
                                
                    "asset_name" = Trailer;
                    "asset_status" = Needed;
                ,
                                
                    "asset_name" = Artwork;
                    "asset_status" = Needed;
                ,
                                
                    "asset_name" = "Closed Caption";
                    "asset_status" = Needed;
                ,
                                
                    "asset_name" = Meta;
                    "asset_status" = Needed;
                
            );
            Status = Declined;
            "store_name" = "Netflix Watch <br> Instantly (SD)";
        
    );
    title = "The Red Tail";

)
]

【问题讨论】：

每次数据源更改时，您都需要在 tableview 上调用 reloadDate。在您的代码中，完成附加所有电影标题后，调用：self.tableView.reloadData()

不用说，调用必须在mainQueue上完成

【参考方案1】：

将最后一个标题放入FilmArray 后，调用tableview.reloadData()。你必须在主队列上做，否则你会得到意想不到的结果。