Xcode SO_ERROR when trying to access ObservableObject? - swift

Question

I have an app that is simply pulling JSON from a local web server and displaying the data. I pieced together some example code from a lot of different sources to make it, part of that includes the SessionData ObservableObject class, which contains login info and also contains a variable isLoading which is used to enable/disable a loading overlay. There's a lot of code so I've removed the unimportant parts, but let me know if you need to see more.
class SessionData : ObservableObject {
...
#Published var email = ""
#Published var password = ""
#Published var isLoading = false
func login(){
if email == "" || password == ""{
self.alertMsg = "Please enter email and password!"
self.alert.toggle()
return
}
withAnimation{
self.isLoading.toggle()
}
Auth.auth().signIn(withEmail: email, password: password) { (result, err) in
withAnimation{
self.isLoading.toggle()
}
...
...
}
You can see how the above code is toggling isLoading, which then affects the LoginView here:
var body: some View {
...
if session.isLoading{
LoadingView()
}
...
}
That all works fine. However, another aspect of my code is the UserViewer, which is where the json is loaded. There is also class FetchPosts, which is used to fetch and store the actual json, which the UserViewer has access to.
class FetchPosts: ObservableObject {
#Published var posts = [Post]()
#Published var session = SessionData()
init(api: Bool, session: SessionData) {
if api {
withAnimation{
print("loading")
print(session.logged_in)
//session.isLoading.toggle()
}
let url = URL(string: MyAPI.address)!
URLSession.shared.dataTask(with: url) {(data, response, error) in
do {
if let postsData = data {
let decodedData = try JSONDecoder().decode(Response.self, from: postsData)
DispatchQueue.main.async {
self.posts = decodedData.result
withAnimation{
print("loaded")
print(session.logged_in)
//session.isLoading.toggle()
}
}
} else {
print("No data")
}
} catch {
print("Error: \(error)")
}
}.resume()
} else {
...
}
}
}
}
And this shows how the overall ContentView is setup:
struct ContentView: View {
#StateObject var session = SessionData()
var body: some View {
if !session.logged_in {
LoginView(session: session)
.preferredColorScheme(.light)
.transition(.move(edge: .bottom))
.animation(.default)
} else {
UserViewer(fetch: FetchPosts(api: true, session: session), session: session)
.transition(AnyTransition.slide)
.animation(.default)
}
}
}
You can see how I'm passing an instantiated Session object to both UserViewer and FetchPosts. The problem takes place in the FetchPosts code... if I comment the session.isLoading.toggle() either before the URLSession line or the one after the json is loaded, Xcode goes bananas! I debugged it for a while, and it seems like if I try and modify anything in the session object within FetchPosts (during the init function), it completely melts down. I get a ton of [connection] nw_socket_handle_socket_event [C11.1:2] Socket SO_ERROR [61: Connection refused] errors, and I can see on my web server that it's rapidly pinging the endpoint. Depending on where I access the session object (before vs after URLSession), the simulator either shows a blank white screen, or it shows the UserViewer screen for a split second with the json loaded, and then reloads, and keeps reloading.
Any idea what is causing this? I figure I must be misunderstanding a concept with passing objects, but I didn't know how to explain it without showing a ton of code! Thanks in advance, I know it's a long post.