flutter - 小部件构建期间如何在抖动中导航？

Question

我试图检测到该用户不再通过身份验证，并将用户重定向到登录名。这就是我的做法

  Widget build(BuildContext context) {
    return FutureBuilder(
        future: _getData(context),
        builder: (context, snapshot) {
          try {
            if (snapshot.hasError && _isAuthenticationError(snapshot.error)) {
                Navigator.push(context, MaterialPageRoute(builder: (context) => LoginView()));
            }

不幸的是，在构建中进行导航无法正常工作。它抛出此错误

flutter: setState() or markNeedsBuild() called during build.
flutter: This Overlay widget cannot be marked as needing to build because the framework is already in the
flutter: process of building widgets.  A widget can be marked as needing to be built during the build 

我不能只返回 LoginView小部件，因为父小部件包含应用程序栏和 float 按钮，并且需要在没有这些控件的情况下显示登录 View 。

有可能做到吗？

Answer 1

将其包装在Future.microtask中。这会将它安排在下一个异步任务周期(即build完成之后)进行。

Future.microtask(() => Navigator.push(
  context, 
  MaterialPageRoute(builder: (context) => LoginView())
));