如何讓 json 在 Swift 3 中填充 UITableView？

Question

我在獲取要顯示的數據時遇到問題。 我已經從 MCViewController 自定義類中發布了我的代碼。 它不會建立。 但是我確實在控制台中得到了數據響應。 有人可以指出我做錯了什么嗎？

class MCViewController: UIViewController, UITableViewDataSource, UITableViewDelegate {

    let message_url = "https://www.testing.com/api/resources/get_film_message/film_id/3825"
    let send_url = "https://www.testing.com/api/resources/send_film_message"
    let film_id = "3825"
    var messageArray = [String]()
    weak var messageView : UITableView!

    func messageView(_ messageView: UITableView, numberOfRowsInSection section: Int) -> Int {
        return messageArray.count
    }
    func messageView(_ messageView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {


        let cell = messageView.dequeueReusableCell(withIdentifier: "msgContent", for:indexPath) as! MessageTableViewCell
        // Configuring Cell
        cell.msgContent.text = messageArray[indexPath.row]
        // Returning the cell
        return cell
    }



    @IBOutlet weak var MessageInput: UITextField!
    @IBAction func Sendmsg(_ sender: Any) {
        Sendmsg(username:MessageInput.text!, password: film_id)
    }

    override func viewDidLoad() {
        super.viewDidLoad()

        messageView.dataSource = self
        messageView.delegate = self
        // Do any additional setup after loading the view.
        //let post_data: NSDictionary = NSMutableDictionary()


        //        post_data.setValue(username, forKey: "username")
        //        post_data.setValue(password, forKey: "password")

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

        let request = NSMutableURLRequest(url: url)
        request.httpMethod = "GET"
        request.setValue("740c94c51891c02b64d6c78840b478fe0b02fe2c", forHTTPHeaderField: "X-API-KEY")
        request.setValue("Basic YmhlZW0uZW5nckBnbWFpbC5jb206YmgzM20=", forHTTPHeaderField: "Authorization")
        request.cachePolicy = NSURLRequest.CachePolicy.reloadIgnoringCacheData
        // Do any additional setup after loading the view.
        var 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: [])
                if let parsedData = json as? [[String:Any]] {
                    for dict in parsedData {
                        if let title = dict["message"] as? String {
                            self.messageArray.append(title)
                            print(json)
                        }
                    }
                }
            }
            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()
    }

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

    func Sendmsg(username:String, password:String)
    {
        let post_data: NSDictionary = NSMutableDictionary()


        post_data.setValue(username, forKey: "message")
        post_data.setValue(password, forKey: "film_id")

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

        let request = NSMutableURLRequest(url: url)
        request.httpMethod = "POST"
        request.setValue("740c94c51891c02b64d6c78840b478fe0b02fe2c", forHTTPHeaderField: "X-API-KEY")
        request.setValue("Basic YmhlZW0uZW5nckBnbWFpbC5jb206YmgzM20=", forHTTPHeaderField: "Authorization")
        request.cachePolicy = NSURLRequest.CachePolicy.reloadIgnoringCacheData

        var 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: [])
                print(json)
            }
            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()


    }

Answer 1

在viewDidLoad() ，在附加到 messageArray 的地方執行 {} catch {}，像這樣調用 messageView.reloadData messageView.reloadData() ：

do
{
    json = try JSONSerialization.jsonObject(with: data!, options: [])
    if let parsedData = json as? [[String:Any]] {
        for dict in parsedData {
            if let title = dict["message"] as? String {
                self.messageArray.append(title)
                print(json)
            }
        }
    }
    messageView.reloadData()  // this is your tableView reload 
}
catch
{
    return
}

通常人們會將他們的 UITableView 對象稱為 tableView，以便在代碼中更容易發現。 不過，沒有人禁止您使用 messageView 作為 tableView 的名稱。