Hello, I came across a strange behaviour of GeometryReader in a NavigationStack. I want to get the size of an image view on the screen, so I add a .background modifier with a GeometryReader inside .background( GeometryReader { geo in Color.clear .onAppear { imgW = geo.size.width imgH = geo.size.height } When I use this on a pure image view it works fine. When this image is inside a NavigationStack I get wrong results when the image is shown the first time. But I get the right results when I move to the next view and come back to this view. Now GeometryReader gives the right size. Is it a bug or do I miss something? For demonstration I wrote a short program with 3 views: import SwiftUI class Router: ObservableObject { @Published var path = NavigationPath() } enum Routes: String, CaseIterable, Hashable { case View2, View3 } struct ContentView: View { @StateObject var router = Router() @State private var imgSize = CGSize() var body: some View { NavigationStack(path: $router.path) { VStack { Image(uiImage: UIImage(named: "testpicture")!) .resizable() .scaledToFit() .background( GeometryReader { geo in Color.clear .onAppear { imgSize = geo.size } }) Text("Width \(Int(imgSize.width)) - Height \(Int(imgSize.height))") Button { router.path.append(Routes.View2) } label: { Text("Press for next view") } } .navigationDestination(for: Routes.self) { route in switch route { case .View2: View2() case .View3: View3() } } } .environmentObject(router) } } struct View2: View { @EnvironmentObject var routes: Router @State private var imgSize = CGSize() var body: some View { VStack { Image(uiImage: UIImage(named: "testpicture")!) .resizable() .scaledToFit() .background( GeometryReader { geo in Color.clear .onAppear { imgSize = geo.size } }) Text("Width \(Int(imgSize.width)) - Height \(Int(imgSize.height))") Button { routes.path.append(Routes.View3) } label: { Text("Press for next view") } } .navigationTitle("View 2") .navigationBarTitleDisplayMode(.inline) } } struct View3: View { @EnvironmentObject var routes: Router var body: some View { VStack { Text("Hello World") Text("& Friends") } .navigationTitle("View 3") } } "testpicture" is a normal photo in the assets section. Test in landscape mode (iPhone 15 plus simulator): Startview shows the picture and "Width 0 - Height 0" (WRONG) Press the button to show the next view View2 shows the picture and "Width 285 - Height 380" (WRONG) Going back to the startview shows "Width 269 - Height 359" (CORRECT) Switching to View2 still gives the wrong results (285, 380) Going to View3 and back to View2 gives the CORRECT result ("Width 236 - Height 315") Same behaviour on a real device. Side note: Going to View3 and back again to View2 gives on every transfer a warning: "Failed to create 0x132 image slot (alpha=1 wide=1) (client=0xe03620e7) [0x5 (os/kern) failure]"