flutter - 当使用 setState() 出现 setState() 回调参数时返回一个 Future

Question

当我使用 setState () 文本出现在调试控制台中..

setState() callback argument returned a Future. The setState() method on _LoginActivityState#9cd91 was called with a closure or method that returned a Future. Maybe it is marked as "async". Instead of performing asynchronous work inside a call to setState(), first execute the work (without updating the widget state), and then synchronously update the state inside a call to setState().

   Future<void> login() async {
final formState = formKey.currentState;
if (formState.validate()) {
  formState.save();
  try {
    final response = await UserController.login({
      "username": username,
      "password": password,
    });

    if (response != null && response["success"]) {
      setState(() async {
        accessToken = response['token'];
        //print(token);
        if (accessToken != null) {
          await Http.setAccessToken("Bearer $accessToken");
        }
        print('$accessToken');
        final getMe = await AiframeworkController.getProfile();
        print('data: $getMe');
        if (getMe != null && getMe['is_verified'] == true) {
           return Navigator.pushReplacement(
                context, MaterialPageRoute(builder: (context) => MainActivity()));
        } else {
          return Center(
                child: CircularProgressIndicator(),
              );
        }
      });
    }
  } catch (e) {
    print(e.message);
  }
}

}

Answer 1

setState() 应该仅用于设置有状态小部件的新状态。您不应该在其中执行异步操作，也不应该从中返回任何内容。我假设“accessToken”是您要更改其状态的字段，因此最好在 setState() 之外执行所有其他操作，然后离开 'accessToken = response['token'];'里面。