我正在使用StatefulShellRoute带有StatefulShellBranches 的 a，如下面的代码所示。

我想要实现以下目标：当我在 的某个路由中时，StatefulShellBranch我想导航到该 的第一个/默认路由StatefulShellBranch。例如，当我导航到 时path5，我想从 内部Widget5导航到path4。

我的用例是，里面有一个后退按钮Widget5，当我直接导航到（即通过深层链接）时，我想在按下后退按钮时path5“弹出”到其中的第一个/默认路线。StatefulShellBranch

路由器

router = GoRouter(
    routes: StatefulShellRoute.indexedStack(
      parentNavigatorKey: parentNavigatorKey,
      branches: [
        StatefulShellBranch(
          navigatorKey: key1,
          routes: [
            GoRoute(
              path: path1,
              pageBuilder: (context, state) {
                return Widget1();
              },
              routes: <RouteBase>[
                GoRoute(
                  path: path2,
                  pageBuilder: (context, state) {
                    return Widget2();
                  },
                ),
                GoRoute(
                  path: path3,
                  pageBuilder: (context, state) {
                    return Widget3();
                  },
                ),
              ],
            ),
          ],
        ),
        StatefulShellBranch(
          navigatorKey: key2,
          routes: [
            GoRoute(
              path: path4,
              pageBuilder: (context, state) {
                return Widget4();
              },
            ),
            GoRoute(
              path: path5,
              pageBuilder: (context, state) {
                return Widget5();
              },
            ),
          ],
        ),
      ],
    ),
    GoRoute(
      parentNavigatorKey: parentNavigatorKey,
      path: path6,
      pageBuilder: (context, state) {
        return Widget6();
      },
    ));

小部件

// Inside Widget5
class BackButton extends StatelessWidget {
  ...
  onPressed() {
    if (router.canPop()) {
      router.pop();
    } else {
      // TODO: Navigate to default route of StatefulShellBranch
      final defaultRoute = router
          .routerDelegate
          .currentConfiguration.???();
    }
  }
  ...
}