我会使用一个服务来检查用户是否通过身份验证，并根据此条件重定向用户。
类似于：

import { AuthenticatorService } from '@aws-amplify/ui-angular';

@Injectable({
  providedIn: 'root'
})
export class AuthService {

  constructor(private authenticator: AuthenticatorService) { }

  public isAuthenticated = () => this.authenticator?.authenticated;
}

然后，您可以实现一个CanActivate保护：

@Injectable({
  providedIn: 'root'
})
export class CanActivateLoginGuard implements CanActivate {

  constructor(
    private authService: AuthService) {
  }

  canActivate(route: ActivatedRouteSnapshot, state: RouterStateSnapshot): Observable<boolean | UrlTree> {

    return this.authService.isAuthenticated() || this.router.createUrlTree(['/login']);
  }
}

现在你应该正确地使用Angular 路由器，以检查用户是否可以访问主页，类似于：

const routes: Routes = [
  {
    path: '',
    canActivate: [CanActivateLoginGuard],
    loadChildren: () => import('./pages/tabs/tabs.module').then(m => m.TabsPageModule)
  },
  {
    path: 'login',
    loadChildren: () => import('./pages/login/login.module').then(m => m.LoginPageModule)
  }
];

@NgModule({
  imports: [
    RouterModule.forRoot(routes, { preloadingStrategy: PreloadAllModules })
  ],
  exports: [RouterModule]
})
export class AppRoutingModule { }

最后是TabsPageRoutingModule：

const routes: Routes = [
  {
    path: 'tabs',
    component: TabsPage,
    children: [
      {
        path: 'home',
        loadChildren: () => import('../home/home.module').then(m => m.HomePageModule)
      }
  {
    path: '',
    redirectTo: '/tabs/home',
    pathMatch: 'full'
  }
];

@NgModule({
  imports: [RouterModule.forChild(routes)],
  exports: [RouterModule],
})
export class TabsPageRoutingModule {}