带有JSON格式的URL数据的适当结构的创建问题。示例中的源URL

Question

网址源代码：https://api.openweathermap.org/data/2.5/weather?q=warsaw&appid=5ca98c08c8abd2bf1fdbd601c3cf3d7e

我尝试过此代码，但它不正确，我在编写适当的结构时遇到问题。

    struct Weather: Codable 

    let weather : [cos]
    let base: String


    

struct cos : Codable 

    let main: String




    let url = URL(string:  "https://api.openweathermap.org/data/2.5/weather?q=warsaw&appid=5ca98c08c8abd2bf1fdbd601c3cf3d7e")

    override func viewDidLoad() 
        super.viewDidLoad()
        json()
    


func json() 
         guard let downloadURL = url else return
         URLSession.shared.dataTask(with: downloadURL)  (data, response, error) in


            guard let data = data, error == nil, response != nil
                else 
                    print("zle cos")
                    return                   
            
            print("downloaded")
            do
                let downloaded =try JSONDecoder().decode([Weather].self,from: 
                                    data)
                print("ok")
                print(downloaded[0].)
             catch 
                print("error")
           
        .resume()