auto_route中创建多个router使用nested router时，navigatorObservers添加FlutterSmartDialog.observer报错

[Dean-Spotec]

版本信息

• Flutter版本：[v3.7.12]
• flutter_smart_dialog版本：[v4.8.2+4]

描述bug/需求

报错：Failed assertion: line 3299 pos 14: 'observer.navigator == null': is not true.
auto_route文档中描述：使用nested router时，必须每次创建新的observer。是否可以暴露SmartNavigatorObserver出来，让我们直接使用：

return MaterialApp.router(                
  routerConfig: _appRouter.config(                         
    navigatorObservers: () => [SmartNavigatorObserver()],                
  ),                  
);

Then we pass our observer to the .config(). Important notice that navigatorObservers property is a builder function that returns a list of observes and the reason for that is a navigator observer instance can only be used by a single router, so unless you're using a one single router or you don't want your nested routers to inherit observers make sure navigatorObservers builder always returns fresh observer instances.

[xdd666t]

• 请参考：SmartDialog在各类路由框架中如何初始化 #131

[Dean-Spotec]

现在项目中就是使用的FlutterSmartDialog.observer然后报错，需求是想实现类似iOS中present一个模块的功能：

2023-06-05.15.47.31.mov

想要这种效果，就需要用到auto_route中的nested router，用了nested router则navigatorObservers必须每次都得新建，不能用静态变量或者存储下来的属性。

我写了一个demo，大佬有空可以看下：
smart_auto.zip

[xdd666t]

• 试下新版本，还是用 FlutterSmartDialog.observer

dependencies:
  flutter_smart_dialog: ^4.9.1

[Dean-Spotec]

大佬神速，🥹