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如何查看当前路线是哪条？

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我想使用抽屉导航到不同的路线，但是如果我已经在该路线上，我每次点击它时都不想打开路线的新实例，而是我希望在这种情况下新的路线是没开 . 到目前为止这是我的代码：

Widget build(BuildContext context){
    return new Drawer(
      child:
          new ListView(
            children: <Widget>[
              new ListTile(
                title: new Text("NewRoute"),
                onTap: () {
                    Navigator.of(context).pop;
                    Navigator.of(context).pushNamed('/NewRoute');
                }
              )
           )
     )
}

我想使用条件语句来检查我们是否在某条路线上 . 我知道有一种方法可以检查我们当前使用Route类的isCurrent的路径

https://docs.flutter.io/flutter/widgets/Route/isCurrent.html

虽然我不知道如何实现它 .

先感谢您！

dart flutter

3 回答

  • 0

    Navigator 不公开当前路线 .

    你可以做的是使用 Navigator.popUntil(callback) 作为 popUtil 传递回调当前 Route ，其中包括它的名称和内容 .

    final newRouteName = "/NewRoute";
bool isNewRouteSameAsCurrent = false;

Navigator.popUntil(context, (route) {
  if (route.settings.name == newRouteName) {
    isNewRouteSameAsCurrent = true;
  }
  return true;
});

if (!isNewRouteSameAsCurrent) {
  Navigator.pushNamed(context, newRouteName);
}
    回复于
  • 2

    Rémi's answer真的对我很有帮助，但是如果你是我的版本，还有一些额外的检查和解释性文件：

    /// Navigates through the application. Only replaces the top Route if it is
/// different from the new Route. Always keeps the home page as base of the
/// Navigator stack. New screens are pushed on the Navigator stack. When the
/// user switches between non-home screens, the new screen replaces the old
/// screen. In this way, the stack of screens from the drawer is never higher
/// than 2. Returning to the HomeScreen is done by just popping the current
/// Route.
void _changeRoute(BuildContext context, String newRouteName) {
  // Close drawer
  Navigator.pop(context);

  // Check current screen status
  bool currentRouteIsHome = false;
  bool currentRouteIsNewRoute = false;

  Navigator.popUntil(context, (currentRoute) {
    // This is just a way to access currentRoute; the top route in the 
    // Navigator stack.
    if (currentRoute.settings.name == HomeScreen.ROUTE_NAME) {
      currentRouteIsHome = true;
    }
    if (currentRoute.settings.name == newRouteName) {
      currentRouteIsNewRoute = true;
    }

    // Return true so popUntil() pops nothing.
    return true;
  });

  // Switch screen
  if (!currentRouteIsNewRoute) {
    // Only switch screen if new route is different from current route.
    if (currentRouteIsHome) {
      // Navigate from home to non-home screen.
      Navigator.pushNamed(context, newRouteName);
    } else {
      if (newRouteName == HomeScreen.ROUTE_NAME) {
        // Navigate from non-home screen to home.
        Navigator.pop(context);
      } else {
        // Navigate from non-home screen to non-home screen.
        Navigator.popAndPushNamed(context, newRouteName);
      }
    }
  }
}

    请注意，使用 pushNamed 和 popAndPushNamed 的此实现要求您在 routes: 参数的顶级 MaterialApp 中定义 Route 名称，如下所示：

    new MaterialApp(
  routes: <String, WidgetBuilder>{
    // define the routes
    YOUR_SCREEN_ROUTE_NAME: (BuildContext context) => new YourScreen(),
  },
)
    回复于
  • 5

    使用以下代码检查路由是否是最顶层的...

    Route route = MaterialPageRoute(builder: (context) => WidgetName());
 if(route.isCurrent){
 }
    回复于

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