问从back4app API解码json数据

EN

import UIKit
import CoreData
import Parse

@main
class AppDelegate: UIResponder, UIApplicationDelegate {



    func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {
        // Override point for customization after application launch.
        let configuration = ParseClientConfiguration {
            $0.applicationId = "KwLoFN7Rik2qadAS6dSpnNIv5E0Qd1Uu0nhvO1dt"
            $0.clientKey = "RVNjTMvt5l73jt5GQxsg9GI16CDOiPAbEXiVPTY1"
            $0.server = "https://parseapi.back4app.com"
        }
        Parse.initialize(with: configuration)
        return true
    }

import UIKit
struct restaurant: Decodable{
    let objectId: String
    let restaurant: String
    let name: String
    let description: String
    let calories: String
    let price: String
    let ImageUrl: String
    let type: String
    let createdAt: String
    let updatedAt: String
}

struct restaurants: Decodable{
    let restaurants : [restaurant]
}

import UIKit
import Parse

class ViewController: UIViewController {
    var restaurantStruct : restaurants? = nil
    
    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view.
        testParseConnection()
        if let url = URL(string:"https://parseapi.back4app.com/classes/restaurants"){
            let session = URLSession.shared
            session.dataTask(with: url) { [self] (data, response, err) in
                guard let jsonData = data else {
                    return
                }
                do {
                    let decoder = JSONDecoder()
                    let artworkList = try decoder.decode(restaurants.self, from: jsonData)
                    self.restaurantStruct = artworkList
                    DispatchQueue.main.async {
                        print(self.restaurantStruct ?? " ")
                    }
                    print(self.restaurantStruct!)
                }
                catch let jsonErr {
                    print("Error decoding JSON", jsonErr)
                }
            }
            .resume()
        }
        
        
        
        func testParseConnection(){
            let myObj = PFObject(className:"FirstClass")
            myObj["message"] = "Hey ! First message from Swift. Parse is now connected"
            myObj.saveInBackground { (success, error) in
                if(success){
                    print("You are connected!")
                }
                else{
                    print("An error has occurred!")
                }
            }
        }
        
        
    }
    
}

You are connected!
Error decoding JSON keyNotFound(CodingKeys(stringValue: "restaurants", intValue: nil), Swift.DecodingError.Context(codingPath: [], debugDescription: "No value associated with key CodingKeys(stringValue: \"restaurants\", intValue: nil) (\"restaurants\").", underlyingError: nil))

var query = PFQuery(className:"SoccerPlayers")
query.getObjectInBackgroundWithId("HMcTr9rD3s") {
  (soccerPlayers: PFObject?, error: NSError?) -> Void in
  if error == nil && soccerPlayers != nil {
    print(soccerPlayers)
  } else {
    print(error)
  }
}