SwiftUI - Assign a value from a callback, display in view

Question

I'm stuck on something which should be trivial, using SwiftUI. I am pulling some data back from my API, and simply want to show each item on my view with ForEach.

I have the following function:

@State var workoutVideoList: GetWorkoutVideoListResponse!

func GetWorkoutVideoList() {
    loadingWorkoutVideoList = true
    
    PtPodsApiService.GetWorkoutList(firebaseToken: firebaseAuthToken) { (workoutListResult) -> () in
        DispatchQueue.main.async() {
            workoutVideoList = workoutListResult
            loadingWorkoutVideoList = false
        }
    }
}

I then want to show another view and pass this object into it:

if workoutVideoList != nil {
    BookAppointmentView(workoutVideoList: workoutVideoList)
}
else {
    Text("Nope")
}

For whatever reason, my main thread sees workoutVideoList as nil, even though it's been assigned. I thought using the dispatcher to assign it would solve the problem, but no joy!

Any idea what I'm doing wrong here?

Thanks

Is your @State var on a ViewModel? Is your ViewModel an @ObservableObject if so you should change that to an @Published — xTwisteDx
– xTwisteDx, Commented Jun 3, 2021 at 13:51
@xTwisteDx It's directly in my View, I'll look into Viewmodels in SwiftUI, thanks — JMK
– JMK, Commented Jun 3, 2021 at 14:01
give @State a default value @State var workoutVideoList: GetWorkoutVideoListResponse = false and use onAppear to call GetWorkoutVideoList() but ideally you will eventually get this working in a ViewModel. — lorem ipsum
– lorem ipsum, Commented Jun 3, 2021 at 14:02
I've answered a MVVM question with SwiftUI here, feel free to have a look. It's very simple in Swift. stackoverflow.com/questions/67538721/… — xTwisteDx
– xTwisteDx, Commented Jun 3, 2021 at 14:07

lorem ipsum · Accepted Answer · 2021-06-03 16:51:14Z

1

Give @State a default value @State var workoutVideoList: GetWorkoutVideoListResponse = false and use onAppear to call GetWorkoutVideoList() but ideally you will eventually get this working in a ViewModel.

answered Jun 3, 2021 at 16:51

lorem ipsum

30.9k7 gold badges42 silver badges68 bronze badges

Sign up to request clarification or add additional context in comments.

Collectives™ on Stack Overflow

SwiftUI - Assign a value from a callback, display in view

1 Answer 1

Comments

Your Answer

Linked

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

Comments

Your Answer

Sign up or log in

Post as a guest

Linked

Related