CODE EXAMPLE FOR DART

flutter ios disable back gesture

// Wrap your widget tree with the [WillPopScope] widget.
// The Android back button and AppBar back button will still work.
@override
Widget build(BuildContext context) {
  return WillPopScope(
    onWillPop: () async => !Navigator.of(context).userGestureInProgress,
    child: /* ... */
  );
}