navigation

WillPopScope and onPopInvoked are deprecated, and predictive back on Android 14+ ignores them. How to move each onWillPop pattern to PopScope.canPop and onPopInvokedWithResult, the confirm-dialog loop you have to guard against, the PopScope<T> type crash, and what dart fix will not do for you. Tested on Flutter 3.44.8.

Drive NavigationBar.selectedIndex from StatefulNavigationShell.currentIndex, never from a setState field or a copy made in initState. Measured on Flutter 3.44.8 and go_router 18.0.2: which patterns drift on deep links, context.go and cross-branch pushes, why location-based indexes lie, and how to react to tab changes with didUpdateWidget.

Flutter moved PageTransitionsBuilder and two built-in builders into the widgets layer and CupertinoPageTransitionsBuilder out of Material. What actually breaks (one import, with a misleading 'Not a constant expression' error), what dart fix does and gets wrong for material_ui projects, and how to rewrite custom builders and routes so they no longer depend on Material at all.

Two different things get called a modal window in .NET MAUI 11. PushModalAsync gives you a modal page on every platform. A real OS window that disables its owner has no MAUI API at all, so here is the WinUI OverlappedPresenter.IsModal plus Win32 owner-handle interop that actually works on Windows, and what to do on Mac Catalyst instead.

A complete guide to passing data through Shell navigation in .NET MAUI 11: registering global routes, string query parameters, QueryPropertyAttribute vs IQueryAttributable, the URL-decoding asymmetry between the two, single-use ShellNavigationQueryParameters vs the IDictionary overload that leaks, passing data backwards with ..?key=value, and why QueryPropertyAttribute is not trim safe.

Wrap the same widget on both routes in a Hero with an identical tag and Flutter animates its position and size across the navigation. Full guide: images, flightShuttleBuilder, createRectTween, RectTween arcs, gesture transitions, and the tag collisions that break it. Tested on Flutter 3.44, Dart 3.12.

go_router and auto_route both sit on top of Navigator 2.0, so the real choice is declarative URL routing vs code-generated typed routes vs hand-rolling the Router API. A decision matrix with config for each, and when raw Navigator still wins.

Build a persistent shell with nested routes using ShellRoute and StatefulShellRoute, then wire up path-based deep links that rebuild the full page stack. Full config for Android and iOS, plus the gotchas that break the back stack.