Question

我正在使用启动画面来根据用户的登录状态确定向用户发送的路由。

我的服务在 firebase 上检查用户状态，如下所示：

 Stream<User?> isUserLoggedIn() {
    var user = _firebaseAuth.authStateChanges();

    return user;
  }

我的模型调用服务并根据响应确定用户路由：

  User? handleStartUpLogic() {
    print('Run only once and stop magically printing text!');
    _authenticationServices.isUserLoggedIn().listen((User? user) {
      if (user == null) {
        print('User is signed out!');
        goToSignIn();
      } else {
        print('User is signed in!');
        goToMarket();
      }
    });
  }

...在我的视图中，我设置了模型就绪：

 return ViewModelBuilder<SplashModel>.reactive(
        onModelReady: (model) => model.handleStartUpLogic(),
        createNewModelOnInsert: false,
        builder: (context, model, child) => Scaffold(
              backgroundColor: fontColor,
              body: Center(child: Image.asset('assets/fable_Icon.png')),
            ),

当我运行这段代码时，我得到了这个无休止的循环：

I/flutter (12991): Run only once and stop magically printing text!
I/flutter (12991): Run only once and stop magically printing text!
I/chatty  (12991): uid=10080(u0_a80) 1.ui identical 10 lines
I/flutter (12991): Run only once and stop magically printing text!
I/flutter (12991): Run only once and stop magically printing text!
I/flutter (12991): Run only once and stop magically printing text!
I/flutter (12991): Run only once and stop magically printing text!
I/chatty  (12991): uid=10080(u0_a80) 1.ui identical 32 lines
I/flutter (12991): Run only once and stop magically printing text!
I/zygote  (12991): Do partial code cache collection, code=60KB, data=43KB
I/zygote  (12991): After code cache collection, code=57KB, data=42KB
I/zygote  (12991): Increasing code cache capacity to 256KB
I/flutter (12991): Run only once and stop magically printing text!
I/flutter (12991): Run only once and stop magically printing text!
I/chatty  (12991): uid=10080(u0_a80) 1.ui identical 156 lines
I/flutter (12991): Run only once and stop magically printing text!
I/flutter (12991): Run only once and stop magically printing text!
I/chatty  (12991): uid=10080(u0_a80) 1.ui identical 15 lines
I/flutter (12991): Run only once and stop magically printing text!
I/flutter (12991): Run only once and stop magically printing text!
I/flutter (12991): Run only once and stop magically printing text!
I/chatty  (12991): uid=10080(u0_a80) 1.ui identical 54 lines
I/flutter (12991): Run only once and stop magically printing text!
I/flutter (12991): Run only once and stop magically printing text!
I/chatty  (12991): uid=10080(u0_a80) 1.ui identical 21 lines
I/flutter (12991): Run only once and stop magically printing text!
I/flutter (12991): Run only once and stop magically printing text!

非常感谢您的帮助

Answer 1

build 方法中的任何内容都可以多次构建，例如更新状态时。潜在地，通过获取模型，您正在更新状态，从而触发功能，从而更新状态。你应该把它放在一个 initState() 中。

启动画面上的启动逻辑永远循环

1 个答案: