追加不是开火JSON Swift

所以我现在有下面的代码可以工作

  func createArray() -> [News] {

           return [News(title: "Hello") , News(title: "how") , News(title: "You")]

    }

然而，我想要的是用远程JSON数据替换它，到目前为止，我让它工作到没有错误的地步

然而，tableViewCell似乎不想工作——我相信这与append函数有关

tempNews.append(News(title: $0.title))

现在，我要检查$0.title是否打印出标题，它会打印出标题，因此问题必须是其他内容

newsdata.news.forEach(){
                                print($0.title)

                               // tempNews.append(News(title: $0.title))
                             tempNews.append(News(title: "1123"))

                            }

返回

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但是当我尝试

tempNews.append（新闻（标题：“1123”）

它没有将其附加到tempNews，因此我现在知道附加不起作用

以下内容不适用

 func createArray() -> [News] {
        //var tempNews = [News] = []
        var tempNews : [News] = []


        let news1 = News(title: "Hello")
        let news2 = News(title: "how")
        let news3 = News(title: "You")

        tempNews.append(news1)
        tempNews.append(news2)
        tempNews.append(news3)

        return tempNews
    }

代码

---

问题在屏幕上，表格仍然空白。

您如何确定

tempNews.append（新闻（标题：“1123”）

不工作？什么是

newsdata

？@FaysalAhmed上面是所有的标题，它应该显示什么是

newsdata

？确认您可以在

foreach

循环前后打印

tempNews

数组计数。如果计数打印不同的数字，则追加工作正常。请试试这个。@RussellHarrower在swift中读到了关于结案的内容。您正在执行的任务是一个异步任务，将在稍后而不是立即向您提供数据。因此，在将数据附加到tempNews之前，您将返回

tempNews

。你需要一个完成块。

 func newsfetch() -> [News]{
        var artical = Array<Any>()
        var tempNews: [News] = []
                    let jsonURLString = "https://api.drn1.com.au/api-access/news"
                    guard let feedurl = URL(string: jsonURLString) else {  return tempNews }

                      URLSession.shared.dataTask(with: feedurl) { (data,response,err)
                          in

                          guard let news = data else { return }

                          do{
                            let newsdata = try JSONDecoder().decode(NewsData.self, from: news)

                            newsdata.news.forEach(){
                                print($0.title)

                               // tempNews.append(News(title: $0.title))
                                artical = News(title: "1123")

                            }


                            }catch let jsonErr{

                                print("error json ", jsonErr)
                            }


                      }.resume()


        return tempNews(artical)


          }

//
//  NewsViewController.swift
//  DRN1
//
//  Created by Russell Harrower on 26/11/19.
//  Copyright © 2019 Russell Harrower. All rights reserved.
//

import UIKit


struct NewsData: Decodable{
    let news: [articalData]
}

struct articalData: Decodable{
    let title: String
}

class NewsViewController: UIViewController {
    @IBOutlet weak var tableView: UITableView!

    var news: [News] = []

    override func viewDidLoad() {
      super.viewDidLoad()
        self.newsfetch { news in
            guard let news = news else { return }
        }

        //news = createArray()
      // Do any additional setup after loading the view.
        tableView.delegate = self
        tableView.dataSource = self
    }

    func createArray() -> [News] {

           return [News(title: "Hello") , News(title: "how") , News(title: "You")]

    }

    func newsfetch(_ completionHandler:  @escaping ([News]?)->Void){
        let jsonURLString = "https://api.drn1.com.au/api-access/news"
        guard let feedurl = URL(string: jsonURLString) else {  return }

        URLSession.shared.dataTask(with: feedurl){ (data,response,err)
            in
            guard let news = data else { return }
            do {
                let newsdata = try JSONDecoder().decode(NewsData.self, from: news)
                var tempNews: [News] = []
                newsdata.news.forEach(){
                    tempNews.append(News(title: $0.title))
                }
                completionHandler(tempNews)
            } catch let jsonErr {
                print("error json ", jsonErr)
                completionHandler(nil)
            }
        }.resume()

    }


    /*func newsfetch() -> [News]{

        var tempNews: [News] = []
                    let jsonURLString = "https://api.drn1.com.au/api-access/news"
                    guard let feedurl = URL(string: jsonURLString) else {  return tempNews }

                      URLSession.shared.dataTask(with: feedurl) { (data,response,err)
                          in

                          guard let news = data else { return }

                          do{
                            let newsdata = try JSONDecoder().decode(NewsData.self, from: news)

                            newsdata.news.forEach(){

                                DispatchQueue.main.async {
                                    print($0.title)

                                    tempNews.append(News(title: $0.title))
                                    print(tempNews.count)
                                }
                            }
                            }catch let jsonErr{

                                print("error json ", jsonErr)
                            }


                      }.resume()



        return tempNews

        }*/


  override func viewDidAppear(_ animated: Bool) {
    self.tabBarController?.navigationItem.title = "News"

          //     let controller = AVPlayerViewController()
            //    controller.player = player

                // Modally present the player and call the player's play() method when complete.
          //      present(controller, animated: false) {
           //       player.play()
           //     }


  }

}


extension NewsViewController: UITableViewDataSource, UITableViewDelegate {
    func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
        return news.count
    }

    func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
        let newsa = news[indexPath.row]

        let cell = tableView.dequeueReusableCell(withIdentifier: "NewsCell") as! NewsCell
        cell.setNews(news: newsa)
        return cell
    }
}