json - 创建单元格默认值 TableView 单元格 swift

Question

func downloadJSON(completed: @escaping () -> ()) {
    let url = URL(string:  "my_URL_FILE")
    URLSession.shared.dataTask(with: url!) { (data, response, error) in
        if error == nil {
            do {
                self.notifications = try JSONDecoder().decode([NotificationStats].self, from: data!)
                print(self.notifications)
                DispatchQueue.main.async {
                    completed()
                }
            }catch {
                print("JSON Error")

            }
        }
    }.resume()
}

如果 JSON id 为空，我需要在结构中显示一些内容:

struct NotificationStats:Decodable {
    let Tipo: String
    let Destinatario: String
    let MittenteNome: String
    let MittenteCognome: String
    let DataOra: String
    let FotoBici: String
    let CoordinataX: String
    let CoordinataY: String
    let Stato: String
    let IdNotifica: String
    let IdMittente: String
    let IdDestinatario: String
    let IdBici: String
    let FotoMittente: String
}

我正在通过此调用导入我的结构:

var notifications = [NotificationStats]()

然后我需要在表格 View 中创建一个单元格，例如“无通知”。

我可以为我的结构指定默认值吗？

这是我创建表格 View 的代码

func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int{
        print(notifications.count)
        return notifications.count

    }
    func tableView(_ tableView: UITableView, heightForRowAt indexPath: IndexPath) -> CGFloat {
        return 100
    }
    func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
        let cell = tableView.dequeueReusableCell(withIdentifier: "customCell") as! NotificheCustomTableViewCell
        let imgURL = NSURL(string: "my_url/\(notifications[indexPath.row].FotoBici)")
        if imgURL != nil{
            let data = NSData(contentsOf: (imgURL as URL?)!)
            cell.bikeImage?.image = UIImage(data: data! as Data)
        }
        cell.tipoLabel?.text = "\(notifications[indexPath.row].Tipo.capitalized)"
        cell.dataOraLabel?.text = "\(notifications[indexPath.row].DataOra)"

        let image = UIImage(named: "arrow-full.png")?.renderResizedImage(newWidth: 30)
        let imageViewNew = UIImageView(image: image)

        let imageSeen = UIImage(named: "arrow-empty.png")?.renderResizedImage(newWidth: 30)
        let imageViewSeen = UIImageView(image: imageSeen)

        if (notifications[indexPath.row].Stato == "nuova"){
            cell.accessoryView = imageViewNew
        }else{
            cell.accessoryView = imageViewSeen

        }
        cell.cellView.layer.cornerRadius = 10

        return cell
    }

我想了解如何处理现在打印“jsonerror”的 catch 的事实。我想创建一个单元格来显示文本规则，以防程序输入捕获“没有通知您”。

Answer 1

喜欢:

func tableView(tableView: UITableView, footerForHeaderInSection section: Int) -> CGFloat {
    if notifications.count > 0 {
        return 0
    } else {
        return hightOfView
    }
}
func tableView(tableView: UITableView, viewForfooterInSection section: Int) -> UIView?{
    MakeViewForDisplayNoNotification()
}