Question

我尝试了很多事情，但似乎都没有用。我有这个JSON [{"id":"1","name":"Dua Kumayl","location":"IABAT","date":"2019-06-13","Islamic":"Shawwal 8,1440","time":"19:30:00.000000","imageURL":""] 通过此链接：http://iabat.org/data.php 我尝试使用以下代码在Swift中获取数据：

import UIKit
   struct Event: Decodable {
       let id, name, location, date: String
       let Islamic, time, imageURL: String
    }
   class EventsViewController: UIViewController {
         override func viewDidLoad() {
             super.viewDidLoad()
             let url = "http://iabat.org/data.php"
             guard let urlObj = URL(string: url) else {return}     
              URLSession.shared.dataTask(with: urlObj) {(data, 
    response, error) in

        do {
            var Events = try JSONDecoder().decode([Event].self, from: 
       data!)

            for Event in Events {
                print("Hi")
                print(Event)
                print(Event.name)
            }
        }
        catch {
            print("error")
            }
        }
    }
}

但是由于某些原因，它不起作用。即使它是for Event in Events do / catch中的String，它也不会打印任何内容。

Answer 1

您需要通过调用dataTask来启动resume()，并且始终执行print(error)来跟踪错误

 class EventsViewController: UIViewController {
         override func viewDidLoad() {
             super.viewDidLoad()
             let url = "http://iabat.org/data.php"
             guard let urlObj = URL(string: url) else {return}     
              URLSession.shared.dataTask(with: urlObj) {(data, 
    response, error) in

        do {
            var Events = try JSONDecoder().decode([Event].self, from: 
       data!)

            for event in Events {
                print("Hi")
                print(event)
                print(event.name)
            }
        }
        catch {
            print(error)
            }
        }.resume() // here
    }
}

Answer 2

您忘记添加.resume()来在URLSession.shared.dataTask的末尾发送请求。

无法从JSON Swift获取数据

2 个答案: