Flutter中的守卫

Flutter中的守卫

我也在这个问题上绊脚石，最终

FutureBuilder

为此使用了一个。看看我的路线：

final routes = {  '/': (BuildContext context) => FutureBuilder<AuthState>(    // This is my async call to sharedPrefs    future: AuthProvider.of(context).authState$.skipWhile((_) => _ == null).first,    builder: (BuildContext context, AsyncSnapshot<AuthState> snapshot) {      switch(snapshot.connectionState) {        case ConnectionState.done:          // When the future is done I show either the LoginScreen// or the requested Screen depending on AuthState          return snapshot.data == AuthState.SIGNED_IN ? JobsScreen() : LoginScreen()        default:          // I return an empty Container as long as the Future is not resolved          return Container();      }    },  ),};

如果要跨多个路径重用代码，则可以扩展FutureBuilder。