ios - Creation problem with appropriate struct for URL data in JSON format. Source URL in example

Question

Url source code : https://api.openweathermap.org/data/2.5/weather?q=warsaw&appid=5ca98c08c8abd2bf1fdbd601c3cf3d7e

I tried this code but it's not correct, i have problem with writing appropriate struct.

    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()    
    }

Answer 1

This does not represent the entire data, I left some work for you ??

Please read the JSON carefully, all dictionaries ({}) can be decoded into a struct, all values in double quotes are String, floating point numeric values are Double, the other Int, the Int dates starting with 1523... can be decoded to Date with the appropriate date strategy:

let jsonString = """
{"coord":{"lon":21.01,"lat":52.23},"weather":[{"id":800,"main":"Clear","description":"clear sky","icon":"01d"}],"base":"stations","main":{"temp":294.15,"pressure":1012,"humidity":52,"temp_min":294.15,"temp_max":294.15},"visibility":10000,"wind":{"speed":6.7,"deg":90},"clouds":{"all":0},"dt":1523548800,"sys":{"type":1,"id":5374,"message":0.0023,"country":"PL","sunrise":1523504666,"sunset":1523554192},"id":756135,"name":"Warsaw","cod":200}
"""

struct Root : Decodable {
    let coord : Coordinate
    let weather : [Weather]
    let base : String
    let main : Main
    let dt : Date
}

struct Coordinate : Decodable {
    let lat, lon : Double
}

struct Weather : Decodable {
    let id : Int
    let main, description, icon : String
}

struct Main : Decodable {
    let temp, tempMin, tempMax : Double
    let pressure, humidity : Int
}

---

let data = Data(jsonString.utf8)
do {
    let decoder = JSONDecoder()
    decoder.keyDecodingStrategy = .convertFromSnakeCase
    decoder.dateDecodingStrategy = .secondsSince1970
    let result = try decoder.decode(Root.self, from: data)
    print(result)
} catch { print(error) }