There is an issue with SwiftUI where it is incorrectly instantiating the navigation destination view with a new identity for a navigation stack that is being removed. Here is a minimal reproducible example: struct ContentView: View { @State private var signedIn = false var body: some View { if signedIn { navigationStack(isSignedIn: true) } else { navigationStack(isSignedIn: false) } } private func navigationStack(isSignedIn: Bool) -> some View { NavigationStack(path: .constant(NavigationPath([1]))) { EmptyView() .navigationDestination(for: Int.self) { _ in VStack { Text(isSignedIn ? "Signed In" : "Signed Out") .foregroundStyle(Color.red) Button(isSignedIn ? "Sign Out" : "Sign In") { signedIn = !isSignedIn } } .onFirstAppear { print(isSignedIn ? "signed in" : "signed out") } } } } } struct OnFirstAppearView: ViewModifier { @State private var hasAppeared = false var onAppear: () -> Void func body(content: Content) -> some View { content .onAppear { if hasAppeared { return } hasAppeared = true onAppear() } } } extension View { func onFirstAppear(_ onAppear: @escaping () -> Void) -> some View { ModifiedContent(content: self, modifier: OnFirstAppearView(onAppear: onAppear)) } } When you launch the app it will print "signed out", but when you tap to Sign In it will print "signed out" and "signed in". This shows that onAppear is incorrectly being called for a view that is disappearing and worse yet, it is with a new identity. The onFirstAppear modifier was created to help with detecting the identity change of the view. Tested on Xcode 16.4, on simulator using iOS 18.5 and also on physical device using iOS 18.5. Link to Feedback sent on Feedback Assistant: https://feedbackassistant.apple.com/feedback/18336684

We need to read the value for userActivity.referrerUrl when the app is accessed through a Universal Link, which when using the UIKit lifecycle we can easily do by implementing the method scene(_: UIScene, continue: NSUserActivity) in SceneDelegate and filtering for activity type of NSUserActivityTypeBrowsingWeb. When the app uses the SwiftUI lifecycle that method doesn't get called, even though the app is correctly configured to use AppDelegate and SceneDelegate (through the @UIApplicationDelegateAdaptor wrapper). I can confirm that the setup is correct because the method scene(_: UIScene, willConnectTo: UISceneSession, options: UIScene.ConnectionOptions) in SceneDelegate is called on app launch. The obvious SwiftUI way of achieving the same would be by using the .onContinueUserActivity(NSUserActivityTypeBrowsingWeb) modifier, but that doesn't work. Is this a bug?