如何在执行下一个指令Flutter之前完成异步未来任务

Question

updateUser() {
return FutureBuilder(
        future: updateUserData(),
        builder: (BuildContext context, AsyncSnapshot snapshot) {
          if (snapshot.connectionState != ConnectionState.done) {
            return Text("hello not");
          } else {
            return Text('Hello!');
          }
        },

);}

  @override
  Widget build(BuildContext context) {
    switch (_authStatus) {
      case AuthStatus.notSignedIn:
        return new LoginPage(
          auth: auth,
          CurrentUser: CurrentUser,
          onSignedIn: _signedIn,
        );
      case AuthStatus.signedIn:
        {
          updateUser(); //THIS TAKES A COUPLE SECONDS TO FINISH BUT I NEED TO SEND IT TO THE NEXT PAGE

            return new HomePage(
              auth: auth,
              CurrentUser: CurrentUser,
              onSignedOut: _signedOut,
            );
          }
        }
    }
  }

Answer 1

可以在async函数中使用await关键字。

例如：

  void someFunc() async {
    await someFutureFunction();
    // Your block of code
  }

在这里，您的代码块不会运行，直到某个FutureFunction返回某个内容。