Hello everyone, I just started creating my first app for iOS. I have a question for you. I am creating a List with results taken from a query on my personal database. Now I would like to pass the "f" parameter containing a date to the entire query. Would anyone know how to help me? The error is: " cannot use instance member "f" within property initializer " import SwiftUI struct BarberView: View {     @Binding var f:String                         var fetcher = MovieFetcher(f: f)     var body: some View {                  VStack{             Text("\(f)")                                      List(fetcher.movies ) { movie in                                 VStack (alignment: .leading) {                                     Text(movie.data)                                     Text(movie.ora)                                         .font(.system(size: 11))                                         .foregroundColor(Color.gray)                                     Text(movie.barber)                                     Text(movie.user)                                 }                             }                                   }                     } } public class MovieFetcher: ObservableObject {     @Published var movies = [Movie]()         @Published var f:String               init(f: String){         self.f = f         load(f: f)     }                    func load(f: String) {         let url = NSMutableURLRequest(url: NSURL(string: "http://familyverde.ddns.net/prova/checkapp.php")! as URL)                           url.httpMethod = "POST"                  let postString = "data=\(f)"         url.httpBody = postString.data(using: String.Encoding.utf8)                           print("IL VALORE DI F: \(f)")                      URLSession.shared.dataTask(with: url as URLRequest) {(data,response,error) in             do {                 if let d = data {                     let decodedLists = try JSONDecoder().decode([Movie].self, from: d)                     DispatchQueue.main.async {                         self.movies = decodedLists                     }                 }else {                     print("No Data")                 }             } catch {                 print ("Error")             }                                   }.resume()               } } struct Movie: Codable, Identifiable {     public var id: String     public var data: String     public var ora: String     public var barber: String     public var user: String          enum CodingKeys: String, CodingKey {            case id = "id"            case data = "data"            case ora = "ora"         case barber = "barber"         case user = "user"         } }