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dart - pushReplacement 显示后退箭头颤动

问题描述

我有一个带有自定义底部导航栏的主屏幕，当单击图标时，它将当前索引设置为单击的图标。但是，当单击索引号 2 时，它会执行整页路由到另一个页面以添加“帖子”。提交帖子后，pushReplacement 会返回到主屏幕（以防止返回）。但是在它路由到主屏幕到索引 0 处的默认屏幕后，顶部仍然显示一个后退按钮。单击它后它消失了，但是该屏幕上的数据略有不同。我怎样才能解决这个问题？

我的主屏幕上的部分代码：

Widget customNav() {
  return Container(
      color: Colors.white,
      child: Row(
        mainAxisAlignment: MainAxisAlignment.spaceEvenly,
        children: <Widget>[

         //some icons before

          IconButton(
            icon: Icon(Icons.add_circle),
            onPressed: () => Navigator.push(
                context,
                FadeRoute(
                    builder: (_) => BlocProvider<AppBloc>(
                        builder: (_, bloc) => bloc ?? AppBloc(),
                        onDispose: (_, bloc) => bloc.dispose(),
                        child: AddPost(userBloc: widget.userBloc)))),
          ),

          //icons after

        ],
      ));
}

添加帖子页面：

_submitFunc() async {
 // sending it to backend
  if (everything is good) {
    Navigator.pushReplacement(
      context,
      FadeRoute(
          builder: (_) =>
              BlocProvider<AppBloc>(
                  builder: (_, bloc) => bloc ?? AppBloc(),
                  onDispose: (_, bloc) => bloc.dispose(),
                  child: MainScreen(userBloc: widget.userBloc))),
    );
  }

标签： dartflutter

解决方案

似乎这可能是一个路由问题。Navigator.pushReplacement()替换您在该路线中所拥有的任何东西，因此您实际上是在设置一条路线：

start: MainScreen
push:  MainScreen -> AddScreen
pushReplacement: MainScreen (A) -> MainScreen (B)

This is why the back button goes away after you tap it, it takes you from MainScreen B (which has historical context to go back to) to MainScreen A (which doesn't).

You may want to use Navigator.pop() to return to the original MainScreen instead of replacing the current view with a new one, or use 

Navigator.pushAndRemoveUntil(newRoute, (route)=>false);

to clear all Navigator route history if you want to send the user to a new screen without being able to go back at all.

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