ios/swift - 我无法附加表格 View 单元格

Question

我想从服务器获取数据并将其显示为TableView。获取数据成功。然而，数据只能在“getDur1Data()”函数中通过追加到TableList中才能正常工作，这在类中不起作用...

所以我不知道为什么 TableView.count == 0 在那里(我之前在“TableList”中附加了“listSeparated”...)

我也希望知道为什么在 getDur1Data() 中的“print(self.Table.cout)”之前输出“print("row value (row)")”

class CustomPortController : UITableViewController {
    var TableList = Array<CustomPortVO>()
    var listSeparated = CustomPortVO()

    func getDur1Data(){
    …
          self.TableList.append(self.listSeparated)
          print(self.TableList.count) //in here, it works well so output is "1", "2", "3"..
   }

  override func viewDidLoad() {
        super.viewDidLoad()
        self.getDur1Data()
    }
override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
        let row  = self.TableList.count
        print("row value \(row)") // in here, "row value 0" is output three times
        return row
    }
}

已编辑 - 重写所有代码

class CustomPortController : UITableViewController {
    var TableList = Array<CustomPortVO>()
    var listSeparated = CustomPortVO()

    override func viewWillAppear(_ animated: Bool) {


        self.tableView.reloadData()

    }
    override func viewDidLoad() {
        super.viewDidLoad()

        self.getDur1Data()

    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }
    override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
        let row  = self.TableList.count
        print("row value \(row)")
        return row

    }
    override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
        let row = self.TableList[indexPath.row]

//        let cell = tableView.dequeueReusableCell(withIdentifier: "ListCell1") as! UITableViewCell
//        NSLog("result=\(row.title), row index=\(indexPath.row)");

        let cell = tableView.dequeueReusableCell(withIdentifier: "ListCell1") as! CustomPortTableViewCell
        cell.indexNum?.text = "\(row.indexNum!)"
        cell.nameOfStyle?.text = row.title
        cell.percentage?.text = row.rating
        return cell
    }
    override func tableView(_ tableView: UITableView, willDisplay cell: UITableViewCell, forRowAt indexPath: IndexPath) {
        let row = self.TableList[indexPath.row]
//        NSLog("result=\(row.title), row index=\(indexPath.row)");
        /*
        let cell = tableView.dequeueReusableCell(withIdentifier: "ListCell1") as! CustomPortTableViewCell
        cell.indexNum?.text = "\(row.indexNum!)"
        cell.nameOfStyle?.text = row.title
        cell.percentage?.text = row.rating*/

    }



    func getDur1Data(){
        let url1:String  = "private url, sorry :)"
        let url1Enc = URL(string: url1)
        if let _url = url1Enc{
            var request = URLRequest(url: _url)
            request.httpMethod = "get"

            let session = URLSession.shared
            let task = session.dataTask(with: request) { (data: Data?, response: URLResponse?, error: Error?) in
                guard error == nil && data != nil else{
                    if let err = error{
                        print(err.localizedDescription)
                    }
                    return
                }

                if let _data = data{
                    if let strData = NSString(data: _data, encoding: String.Encoding.utf8.rawValue){
                        let str = String(strData)

                        var separatedData = str.split(separator: "=")
                        for i in 1...3{
                            separatedData[i*4].removeFirst()
                            var index = separatedData[i*4].index(of:"\"")!
                            separatedData[i*4] = separatedData[i*4][..<index]
                            separatedData[i*4+1].removeFirst()
                            index = separatedData[i*4+1].index(of:"\"")!
                            separatedData[i*4+1] = separatedData[i*4+1][..<index]
                            print("\(separatedData[i*4])\n");
                            print("\(separatedData[i*4+1])\n")
                        }

                        for row in 1...3{
                            self.listSeparated.indexNum = row
                            self.listSeparated.rating = String(separatedData[row*4 + 1])
                            self.listSeparated.title = String(separatedData[row*4])
                            print(self.listSeparated.indexNum!)
                            print(self.listSeparated.rating!)
                            print(self.listSeparated.title!)
                            self.TableList.append(self.listSeparated)

                            print(self.TableList.count)
                            print(self.TableList[row-1])
                        }

                        DispatchQueue.main.async{
                        }

                    }

                }else{
                    print("data nil")
                }
            }
            task.resume()

        }


    }
}

当我构建这个项目时，第一次我看不到任何表格单元格。但是回到 Tableview 后，我可以看到 3 个表格单元格具有相同的数据，如下所示

1 abcd 1234
1 abcd 1234
1 abcd 1234

Answer 1

根据请求更新数组后，您需要调用 self.tableView.reloadData()。

此外，在获取表中的数据时，您必须使用 viewWillAppear 而不是 viewDidLoad