Question

我正在尝试删除表格视图中的帖子，但在执行JSON序列化时遇到错误，在此行中

let json = try JSONSerialization.jsonObject(with: data!, options: []) as? [String: AnyObject]

如果我通过浏览器访问url，数据会在数据库中成功删除，如果从浏览器访问它，它也会像这样返回json响应

{＆＃34;消息＆＃34;：＆＃34;已成功删除＆＃34;，＆＃34;结果＆＃34;：1，＆＃34;状态＆＃34;：＆＃34;图片已被删除已从驱动器中删除＆＃34;}

但我得到一个错误，说json文本不是以数组或对象（代码= 3840）开头，但正如你在上面看到的那样，它是一个json字典

错误域= NSCocoaErrorDomain代码= 3840＆＃34; JSON文本不是以数组或对象开头，而是选项允许未设置片段。＆＃34; UserInfo = {NSDebugDescription = JSON文本不以数组或对象开头，并且选项允许未设置片段。}

这是我使用的完整代码。这里出了什么问题？谢谢

func deletePost(_ indexPath: IndexPath) {

    let tweet = tweetsArray[indexPath.row]
    let uuid = tweet["uuid"] as! String
    let imagePath = tweet["imagePath"] as! String

    let url = URL(string: "http://localhost/Twitter/post.php")
    var request = URLRequest(url: url!)
    request.httpMethod = "POST"
    let body = "uuid=\(uuid)&path=\(imagePath)"
    request.httpBody = body.data(using: String.Encoding.utf8)

    let session = URLSession.shared
    let task = session.dataTask(with: request) { (data, response, error) in

        if error == nil {

            do {

                let json = try JSONSerialization.jsonObject(with: data!, options: []) as? [String: AnyObject]

                guard let parsedJSON = json else {
                    print("error while parsing JSON")
                    return
                }

                let jsonMessage = parsedJSON["message"]
                if jsonMessage != nil {
                    // hilangkan data di array
                    self.tweetsArray.remove(at: indexPath.row)
                    self.imagesArray.remove(at: indexPath.row)

                    // hilangkan rownya pada table view
                    self.tableView.deleteRows(at: [indexPath], with: .automatic)
                    self.tableView.reloadData()
                }
            }
            catch {

                // get main queue to communicate back to user
                DispatchQueue.main.async(execute: {
                    let message = "\(error)"
                    self.showAlert(alertTitle: "sorry", alertMessage: message, actionTitle: "OK")
                })
                return
            }
        }
        else {

            // get main queue to communicate back to user
            DispatchQueue.main.async(execute: {
                let message = "\(error!.localizedDescription)"
                self.showAlert(alertTitle: "sorry", alertMessage: message, actionTitle: "OK")
            })
            return
        }
    }
    task.resume()
}

Answer 1

您可以尝试打印服务器响应。请更改catch块中的代码。并识别服务器端的错误。

您的服务器数据是正确的json formate然后打印出您的服务器数据并检查服务器数据是否有效。

URLSession.shared.dataTask(with: url) { (data, response, error) in

        if let jsonData = data {
            do {
                let parsedData = try JSONSerialization.jsonObject(with: jsonData, options: .mutableLeaves) as! [String: AnyObject]
                if let area = parsedData["AREA"] as? [[String: AnyObject]] {
                    for a in area {
                        print(a["area_name"])
                        print(a["price"])
                    }
                }
            }
            catch let err{
                print("\n\n===========Error===========")
                print("Error Code: \(error!._code)")
                print("Error Messsage: \(error!.localizedDescription)")
                if let data = data, let str = String(data: data, encoding: String.Encoding.utf8){
                    print("Server Error: " + str)
                }
                debugPrint(error)
                print("===========================\n\n")

                debugPrint(err)
            }
        }
        else {
            debugPrint(error as Any)
        }

    }.resume()

执行JSON序列化时出错ErrorDomain Code = 3840

1 个答案: