自定义返回按钮

//改变颜色
Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        leading: BackButton(
            color: Colors.black
        ),

//改变颜色
  appBar: AppBar(
          iconTheme: IconThemeData(
            color: Colors.black, //change your color here
          ),
          title: Text("Sample"),
          centerTitle: true,
        ),
        body: Text("Sample body"),
      );
//自定义返回按钮
     appBar: AppBar(
               leading: new IconButton(
               icon: new Icon(Icons.arrow_back, color: Colors.black),
               onPressed: () => Navigator.of(context).pop(),
              ), 
              title: Text("Sample"),
              centerTitle: true,
            ),
            body: Text("Sample body"),

隐藏返回按钮

// methods
void changeScreen(BuildContext context, Widget widget){
  Navigator.push(context, MaterialPageRoute(builder: (context) => widget));
}

void changeScreenReplacement(BuildContext context, Widget widget){
  Navigator.pushReplacement(context, MaterialPageRoute(builder: (context) => widget));
}

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);

https://stackoverflow.com/a/51508446
https://stackoverflow.com/a/46713257