我认为解决办法如下

你实际上可以:

Don't want to display that ugly back button ( :] ), and thus go for : AppBar(...,automaticallyImplyLeading: false,...); Don't want the user to go back - replacing current view - and thus go for: Navigator.pushReplacementNamed(## your routename here ##); Don't want the user to go back - replacing a certain view back in the stack - and thus use: Navigator.pushNamedAndRemoveUntil(## your routename here ##, f(Route<dynamic>)→bool); where f is a function returning truewhen meeting the last view you want to keep in the stack (right before the new one); Don't want the user to go back - EVER - emptying completely the navigator stack with: Navigator.pushNamedAndRemoveUntil(context, ## your routename here ##, (_) => false);

SliverAppBar ( automaticallyImplyLeading:假的,}

//如果你想隐藏后退按钮使用下面的代码

class SecondScreen extends StatelessWidget {
@override
Widget build(BuildContext context) {
return Scaffold(
  appBar: AppBar(
    title: Text('Remove Back Button'),
    
    //hide back button
    automaticallyImplyLeading: false,
   ),
  body: Center(
    child: Container(),
  ),
);
}
}

//如果你想隐藏后退按钮并停止弹出动作，使用下面的代码

class SecondScreen extends StatelessWidget {

@override
Widget build(BuildContext context) {
 return new WillPopScope(

  onWillPop: () async => false,
  child: Scaffold(
    appBar: AppBar(
      title: Text("Second Screen"),
      //For hide back button
      automaticallyImplyLeading: false,
    ),
    body: Center(
        child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          crossAxisAlignment: CrossAxisAlignment.center,
          children: <Widget>[
            RaisedButton(
              child: Text('Back'),
              onPressed: () {
                Navigator.pop(context);
              },
            ),
          ],
        )
    ),
  ),
);
 }

当您使用导航器时。pushNamed返回箭头自动出现在新屏幕的appBar上，用于返回前一个屏幕。如果你不想要这个功能，你所要做的就是在你的appBar属性中自动写入callyimplyleading: false。

  appBar: new AppBar(title: new Text("SmartDocs SPAY"),backgroundColor: Colors.blueAccent, automaticallyImplyLeading:false,
        leading: new Container(),
      ),

工作正常

使用这个条子AppBar

SliverAppBar (
        automaticallyImplyLeading: false,
        elevation: 0,
        brightness: Brightness.light,
        backgroundColor: Colors.white,
        pinned: true,
      ),

使用这个正常的Appbar

 appBar: AppBar(
    title: Text
    ("You decide on the appbar name"
    style: TextStyle(color: Colors.black,), 
    elevation: 0,
    brightness: Brightness.light,
    backgroundColor: Colors.white,
    automaticallyImplyLeading: false,

),