SwiftUI view lifecycle

ContentView.swift

import SwiftUI

struct ContentView: View {
    let items = ["a", "b", "c"]
    
    var body: some View {
        NavigationView {
            List {
                ForEach(items, id: \.self) { item in
                    NavigationLink(item, destination: DetailView())
                }
            }.onAppear {
                print("onAppear list")
            }.onDisappear {
                print("onDisappear list")
            }
        }
    }
}

struct DetailView: View {

    var body: some View {
        Text("detail")
        .onAppear {
            print("onAppear detail")
        }.onDisappear {
            print("onDisappear detail")
        }
    }
}

After starting the app (only list is visible):
onAppear list

After selecting an entry from the list:

onDisappear list
onAppear list
onAppear detail
onDisappear list
onDisappear detail

After going back to list:

onAppear list
onAppear detail
onDisappear detail

🤷‍♂️