POST request errors in swift - json

Question

I am new to swift (I am more used to python) and I am trying to send a POST request to a server and use the JSON response. I have been able to make the POST request and retrieve data and print it using this code that I got from a tutorial but the variable server.authenticated wasn't changing and after I made some changes now I'm getting two errors: Instance member 'authenticated' cannot be used on type 'HttpAuth' and 'String' is not convertible to 'Any'
Could someone please help?
import SwiftUI
import Combine
struct ServerMessage : Decodable {
let status, message: String
}
class HttpAuth: ObservableObject {
var didChange = PassthroughSubject<HttpAuth, Never>()
#Published var authenticated = false {
didSet{
didChange.send(self)
}
}
func checkDetails(username: String, password: String) {
guard let url = URL(string: "https://example.com") else { return }
let body: [String: String] = ["username": username, "password": password ]
let finalBody = try! JSONSerialization.data(withJSONObject: body)
var request = URLRequest(url: url)
request.httpMethod = "POST"
request.httpBody = finalBody
request.setValue("application/json", forHTTPHeaderField: "Content-Type")
URLSession.shared.dataTask(with: request) { (data, response, error) in
guard let data = data else { return }
let finalData = try! JSONDecoder().decode(ServerMessage.self, from: data)
print(finalData)
if finalData.status == "ok" {
DispatchQueue.global().async {
HttpAuth.authenticated = true //ERROR: Instance member 'authenticated' cannot be used on type 'HttpAuth'
print("correct credentials")
}
}
}.resume()
}
}
struct loginView: View {
#State private var username: String = ""
#State private var password: String = ""
#State var server = HttpAuth()
var body: some View {
VStack{
TextField("Username", text: $username)
.textFieldStyle(RoundedBorderTextFieldStyle())
.frame(width: 200, height: nil)
.multilineTextAlignment(.center)
.disableAutocorrection(true)
.accessibility(identifier: "Username")
.autocapitalization(.none)
SecureField("Password", text: $password)
.textFieldStyle(RoundedBorderTextFieldStyle())
.frame(width: 200, height: nil)
.multilineTextAlignment(.center)
.disableAutocorrection(true)
.accessibility(identifier: "Password")
Button(action: {
self.server.checkDetails(username: self.username, password: self.password)
//print(self.username + ", " + self.password)
}) {
HStack{
Spacer()
Text("Login").font(.headline).foregroundColor(.white)
Spacer()
}.padding(.vertical, 10)
.background(Color.red)
.padding(.horizontal, 40)
}
if self.server.authenticated {
Text("Correct Credentials")
} //ERROR: 'String' is not convertible to 'Any'
}
}
}
struct loginView_Previews: PreviewProvider {
static var previews: some View {
loginView()
}
}

Answer 1

You need to pass HttpAuth to your loginView like
struct loginView_Previews: PreviewProvider {
static var previews: some View {
loginView().environmentObject(HttpAuth())
}
}
then in your LoginView declare EnvironmentObject of HttpAuth
struct loginView: View {
#State private var username: String = ""
#State private var password: String = ""
#EnvironmentObject var server : HttpAuth
...