当调用外部函数时，在内部函数数组中添加解析的json不会显示任何内容

Question

这是我第一次在这里发布信息，也是我第一次练习解析json。非常抱歉，如果这篇文章有什么问题

我试图在Json中获取标题，描述和imageUrl，并将其附加在newsList数组中。我已经将它们追加到parseURL（）函数内部，但是当我在parseURL（）函数外部调用newsList数组时，里面没有任何内容

NewsList.swift

import UIKit

class NewsListVC: UIViewController {
    @IBOutlet weak var newsTableView: UITableView!

    var newsList: [News] = []
    var newstitle: String!
    var newsimage: String!
    var newsdescription: String!

    override func viewDidLoad() {
        super.viewDidLoad()

        print(parseURL())

        newsTableView.delegate = self
        newsTableView.dataSource = self
    }

}

extension NewsListVC {

    func parseURL() -> [News] {
        let theURL = 
             "https://newsapi.org/v2/top-headlines?country=us&category=business&apiKey=mykey"
        let url = URL(string: theURL)
        URLSession.shared.dataTask(with:url!) { (data, response, error) in

            if error != nil {
                print("didn't work")
            } else {
                //this will try to present the keys and values inside json dictionary
                do {
                    //this will take the json that has a value of string and any value and store it in parseData
                    let parseData = try JSONSerialization.jsonObject(with: data!) as! [String: Any]

                    for (key, value) in parseData {
                        if (key == "articles") {
                            if let articleArray:[ [String:Any] ] = value as? [ [String:Any] ] {
                                //this will loop through all articles
                                for dict in articleArray {
                                    for (key, value) in dict {
                                        if (key == "urlToImage") {
                                            self.newsimage = value as? String
                                        } else if (key == "title") {
                                            self.newstitle = value as? String
                                        } else if (key == "description") {
                                            self.newsdescription = value as? String
                                        }

                                    }
                                    self.newsList.append(News(title: self.newstitle, image: self.newsimage, description: self.newsdescription))
                                    print(self.newsList[self.newsList.count - 1].title!)
                                }
                            }
                        }
                    }


                } catch let error as NSError {
                    print(error)
                }
            }
            }.resume()
        return self.newsList
    }
}

News.swift

struct News {
    var title: String!
    var image: String!
    var description: String!

    init(title: String, image: String, description: String) {
        self.title = title
        self.image = image
        self.description = description
    }
}

我只想获取json并将其附加到数组中，以便可以在tableviewcell标签和imageView中分配数组的值。