ListStateObjectLeak.swift

import SwiftUI 

@main
struct MyApp: App {
    
    var body: some Scene {
        WindowGroup {
            MyAppView()
        }
    }
}

struct MyAppView: View {
    
    var body: some View {
        NavigationStack {
            MyList(id: 1)
                .navigationDestination(for: Int.self) { index in
                    MyList(id: index)
                }
        }
    }
}

struct MyList: View {
    
    let id: Int
    
    @StateObject private var manager = Manager()
    
    var body: some View {
        // Binding a List's selection to a StateObject results in
        // the StateObject's deinit never being called.
        // Remove the binding, and deinit is called once the view
        // has been popped from the stack.
        List(selection: $manager.selection) {
            Section {
                ForEach(1...100, id: \.self) { id in
                    Text("Row \(id)")
                }
            }
        }
        .navigationTitle("List \(id)")
        .toolbar {
            NavigationLink("Next List", value: id + 1)
        }
    }
}

class Manager: ObservableObject {
    
    @Published var selection = Set<Int>()
    
    init() {
        print("✨ init Manager")
    }
    
    deinit {
        print("♻️ deinit manager")
    }
}

struct MyApp_Preview_Provider: PreviewProvider {
    
    static var previews: some View {
        MyAppView()
    }
}