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I fetched data from API using URLSession in swiftUI, but it takes a long time. How can I cache data?

Forums > SwiftUI

class AriclesViewModel: ObservableObject{

    @Published var articles = [Articles]()

   func fetchData(){
    let API_KEY = ""
    let API_URL = "https://newsapi.org/v2/everything?q=apple&from=2021-04-02&to=2021-04-02&sortBy=popularity&apiKey=\(API_KEY)"
        guard let url = URL(string: API_URL)else{
            print("Invalid URL . . . ")
            return
        }
        let request = URLRequest(url: url)
        let decoder = JSONDecoder()
        URLSession.shared.dataTask(with: request) { (data, _, error) in

            if let data = data{
                do{
                let response = try decoder.decode(News.self, from: data)
                    DispatchQueue.main.async {
                        self.articles = response.articles.compactMap(){$0}
                    }

                   print(response)
                }catch{
                    print(error.localizedDescription)
                }
            }
            print(error?.localizedDescription as Any)
        }.resume()
    }

    var dateFormatter : DateFormatter?{
        let formatter = DateFormatter()
        formatter.dateStyle = .full
        return formatter
    }

    func loadImage(ImageUrl: String) -> Data?{
        guard let url = URL(string: ImageUrl) else {return Data()}
        if let data = try? Data(contentsOf: url){
            return data
        }
        return nil
    }
}

   

Have you tried the URL in a web browser to see how long the response takes ?

   

0 dalay in the browser because I hit json file, but when I downlaod images by URLSession and convert it to data to show it inside UIImage, it takes a long time.

   

I used URLSession and Alamofire, same response time.

   

More explenations, I want to reuse fetched images in sub-views or anywhere else. In this point , Images take atime to be presented.

   

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