TabView Reloads all Tab

Could you show the code of the 1st Tab, to see where reload occurs.

This is the tab struct

struct AtlasTabView: View {
   
  @EnvironmentObject var appData: AppData
  @State var reload = false
   
  private var urlRequest: URLRequest?
   
  init() {
    setupData()
  }
   
  var body: some View {
    TabView {
      ValleyFaultSystemTiView()
      .tabItem {
        Label("tab 1", systemImage: "waveform.path.ecg")
      }
       
      WebView(request: urlRequest!)
        .tabItem {
          Label("tab 2", systemImage: "waveform.path.ecg.rectangle")
        }
       
      Text("temp")
      .tabItem {
        Label("tab 3", systemImage: "bird")
      }
    }
  }
}

This is my web view struct

struct WebView : UIViewRepresentable {
   
  let request: URLRequest
  let reload = false
   
  func makeUIView(context: Context) -> WKWebView {
    return WKWebView()
  }
   
  func updateUIView(_ uiView: WKWebView, context: Context) {
    guard context.coordinator.needsToLoadURL else { return }
    uiView.load(URLRequest(url: request.url!))
  }
   
  func makeCoordinator() -> WebView.Coordinator {
    Coordinator()
  }

  class Coordinator {
    var needsToLoadURL = true
  }
}

And this is the 1st tab struct

struct ValleyFaultSystemTiView: View, FeaturesNeeded {
   
  @EnvironmentObject var appData: AppData
  @ObservedObject private var locationManager = LocationManager()
   
  @State private var cameraPosition: GMSCameraPosition?
  @State private var coordinateBounds: GMSCoordinateBounds?
  @State private var circlePopulations = [GMSCircle]()
  @State private var markerShelters = [GMSMarker]()
  @State private var polylinesOfFault = [GMSPolyline]()
  @State private var polylines = [GMSPolyline]()
  @State private var selectedMarker: GMSMarker?
   
  var body: some View {
    MapView(
      circles: circlePopulations,
      markers: markerShelters,
      polylines: polylines,
      cameraPosition: cameraPosition,
      selectedMarker: selectedMarker,
      coordinateBounds: coordinateBounds
    )
    .onAppear() {       
      if let path = Bundle.main.path(forResource: "test", ofType: "kml") {
        do {
          // process markers here
        } catch {
          print(error)
        }
      }
      else {
        print("file not found")
      }
    }
  }
}

@Claude31 I am not sure if the right place is in onAppear since this is in a tab. But if i switch to tab 3, the print code will still be executed inside the // process markers here comment. Currrently, I am getting data from a resource file in the project (problem persists). Once i can fix avoiding having to reload each tab when switching, i will get the data from a url.

Seems that even with a simple view, the component in the tab still gets reloaded

@State private var currentTab = 0      
  var body: some View {
    TabView(selection: $currentTab) {
      Text("he")
        .tabItem {
          Label("boo", systemImage: "bird")
        }
        .tag(0)
       
      LAVAView()
        .tabItem {
          Label(StringTool.localize("lava"), systemImage: "bird")
        }
        .tag(1)
    }

my lava view containst just a text

struct LAVAView: View {  
  init() {
    print("init lava view")
  }
   
  var body: some View {
    Text("hello world")
  }
}

Thoughts @claude31 ?

I tested this very simple code.

struct ContentView: View {
    
    var body: some View {
        NavigationView {
            TabView {
                TestView()
                    .tabItem {
                        Image(systemName: "person.3")
                    }
                TestView3()
                    .tabItem {
                        Image(systemName: "person.2")
                    }
            }
            .navigationTitle("Test")
        }
        .navigationViewStyle(.stack)
    }
}

struct TestView: View {
    init() {
      print("init Test view")
    }
    var body: some View {
        List {
            Text("test1")
            Text("test2")
            Text("test3")
        }
        .listStyle(.plain)
    }
}

struct TestView2: View {
    init() {
      print("init Test view 2")
    }
    var body: some View {
        List {
            Text("test4")
            Text("test5")
            Text("test6")
        }
        .listStyle(.plain)
    }
}

In the console, I get

init Test view
init Test view 2

When view is first displayed. But no more log when I switch tabs.

I tested with your code (slightly modified to get it compiling as Label("boo", systemImage: "bird") causes error):

struct ContentView: View {
    @State private var currentTab = 0
    var body: some View {
        TabView(selection: $currentTab) {
            Text("he")
                .tabItem {
                   Image(systemName: "person.3")
                }
                .tag(0)
            
            LAVAView()
                .tabItem {
                    Image(systemName: "person.2")// StringTool.localize("lava"), systemImage: "bird")
                }
                .tag(1)
        }
    }
}

struct LAVAView: View {
    init() {
        print("init lava view")
    }
    
    var body: some View {
        Text("hello world")
    }
}

Don't get any print on console when I switch tabs.