Downloading Image

How can I fix this?

The error message is saying: Variable 'image' used before being initialized.
You need to initialize the variable image before it is used.

Code Block 
            var image:Data = ???

Many things depend on ArticleManger, but you may need to use completion handler to fill ??? and to fix some other parts.

---

You should better include core parts of your code as text. A link to a full project is helpful for readers who have decided to resolve your issue, but it is not so attracting for many readers who do not want to go deep into a link.

Probably your image is what you get from url ?

if so, initialize the image from url.

https://stackoverflow.com/questions/24231680/loading-downloading-image-from-url-on-swift

@Claude31 Thanks for the response. Below is the core part of the code. As mentioned before, I have a Network Manager class that connects to the server and parses the data. Since I've been able to encapsulate the session into a function called performrequest,
How can I initialize the value of Image to download the images from the server ?

Code Block 
//Data Model
class ArticlesData: NSObject {
    var author: String?
    var title: String?
    var publishedAt: String?
    var urlImage: String?
    var urlWebsite : String?
}
//Network Manger 
class ArticleManger{
    let website = http://newsapi.org/v2/everything?q=coronavirus&sortBy=popularity&apiKey=d&pageSize=50&page=2
    
var articles: [ArticlesData]? = [] // holds array of model object
    func fetchArticles() {
        performRequest(urlString: website)
    }
       func performRequest(urlString: String){
        if let url = URL(string: website) {
            let session = URLSession(configuration: .default)
            let task = session.dataTask(with: url) { (data, response, error) in
                if error != nil{
                    print(error ?? 0)
                    return
                }
                if let data = data {
                    self.articles = self.parseData(data: data)
           }
            }
            task.resume()
            return
        }
    }
func parseData(data :Data)->[ArticlesData]?  {
  do {
let jsonResult = try JSONSerialization.jsonObject(with: data, options: JSONSerialization.ReadingOptions.mutableContainers) as? NSDictionary
    let jsonArticles = jsonResult?["articles"] as? [AnyObject] ?? [] // gets first head of json file and converts it to dictionary
    let article = ArticlesData()
     for jsonArticle in jsonArticles{ // captures data and stores it in the model object
                article.author = jsonArticle["author"] as? String
                article.title = jsonArticle["description"] as? String
                article.publishedAt = jsonArticle["publishedAt"] as? String
                article.urlImage = jsonArticle["urlToImage"] as? String
                article.urlWebsite = jsonArticle["url"] as? String
                articles?.append(article) //put article data in the array
            }
            print(jsonArticles)
        }catch{
           print("\(error)")
        }
        return articles ?? []
    }
}
class LatestNewsViewController: UIViewController {
 //Website API
    let website = "http://newsapi.org/v2/everything?q=coronavirus&sortBy=popularity&apiKey=&pageSize=50&page=2" //Website API
    var urlSelected = ""
    var news = ArticleManger()
    
    //
    @IBOutlet weak var table_view: UITableView!
    //
    override func viewDidLoad() {
        super.viewDidLoad()
        news.fetchArticles()
        table_view.dataSource = self
    }
    
extension UIImageView {
    func downloadImage( url: String){
        let news = ArticleManger()
        news.performRequest(urlString: url)
        DispatchQueue.main.async {
            var image:Data
            self.image = UIImage(data: image)
        }
        
    }

With proper indentation, code is much easier to read.

Code Block 
// Data Model
class ArticlesData: NSObject {
     var author: String?
     var title: String?
     var publishedAt: String?
     var urlImage: String?
     var urlWebsite : String?
}
// Network Manger
class ArticleManger{
     let website =  "http ://newsapi .org/v2/everything?q=coronavirus&sortBy=popularity&apiKey=d&pageSize=50&page=2"
		 // I edited to be able to post on forum
     
     var articles: [ArticlesData]? = [] // holds array of model object
     func fetchArticles() {
          performRequest(urlString: website)
     }
     func performRequest(urlString: String){
          if let url = URL(string: website) {
               let session = URLSession(configuration: .default)
               let task = session.dataTask(with: url) { (data, response, error) in
                    if error != nil{
                         print(error ?? 0)
                         return
                    }
                    if let data = data {
                         self.articles = self.parseData(data: data)
                    }
               }
               task.resume()
               return
          }
     }
     func parseData(data :Data)->[ArticlesData]?  {
          do {
               let jsonResult = try JSONSerialization.jsonObject(with: data, options: JSONSerialization.ReadingOptions.mutableContainers) as? NSDictionary
               let jsonArticles = jsonResult?["articles"] as? [AnyObject] ?? [] // gets first head of json file and converts it to dictionary
               let article = ArticlesData()
               for jsonArticle in jsonArticles{ // captures data and stores it in the model object
                    article.author = jsonArticle["author"] as? String
                    article.title = jsonArticle["description"] as? String
                    article.publishedAt = jsonArticle["publishedAt"] as? String
                    article.urlImage = jsonArticle["urlToImage"] as? String
                    article.urlWebsite = jsonArticle["url"] as? String
                    articles?.append(article) //put article data in the array
               }
               print(jsonArticles)
          } catch {
               print("\(error)")
          }
          return articles ?? []
     }
}
class LatestNewsViewController: UIViewController {
     //Website API
     let website = "http://newsapi.org/v2/everything?q=coronavirus&sortBy=popularity&apiKey=&pageSize=50&page=2" //Website API
     var urlSelected = ""
     var news = ArticleManger()
     
     //
     @IBOutlet weak var table_view: UITableView!
     //
     override func viewDidLoad() {
          super.viewDidLoad()
          news.fetchArticles()
          table_view.dataSource = self
     }
     
     extension UIImageView {
          func downloadImage( url: String){
               let news = ArticleManger()
               news.performRequest(urlString: url)
               DispatchQueue.main.async {
                    var image:Data
                    self.image = UIImage(data: image)
               }
               
}

There are several errors here:
line 58: you need to declare the class LatestNewsViewController to conform to UITableViewDataSource protocol (otherwise, error on line 70) and implement the required delegate functions.

line 73: extension must not be inside a class.

You asked

How can I initialize the value of Image to download the images from the server ?

If I understand your code, data are loaded by performRequest. Exact ?

Code Block 
     func performRequest(urlString: String)   { }

loads self.articles.
What is not clear, is which article you want to use image from ?
What you get are images url (no image data at all yet):
So, if you want to get the image of first article:

Code Block 
let imageOfFirst =  self.articles[0].urlImage ?? !!

Then load
var image by reading this from the url.

Thanks for the solution. Just to clarify would I place the let imageOfFirst = self.articles[0].urlImage ?? !! in perform request function ? If so how would I access it in the extension UIImage ? Also, how do I properly indent code before submitting it ? @Claude31